Inflorescence of 1 to many racemes, these racemes along a common axis;
spikelets plano-convex (in a few species unequally biconvex, or concavo- convex), subsessile along a slender or winged rachis, the back of the fruit turned toward it; first glume typically wanting, developed in a few species;
fertile lemma and palea chart aceous-indurate (thin in P. saccharoides).
Rachis winged (wing suppressed in nos. 16 to 19, with silky spikelets). Fruit pale. (Subgenus Ceeesia.)
Spikelets glabrous.
Racemes not falling from the main axis. Spikelets more than 3 mm. long.
13. P. crassum.
Racemes falling entire from the main axis (tardily in P. candidum; spike-
• lets less than 3 mm. long. Rachis green, foliaceous.
Plants perennial, aquatic 1. P. repens.
Plants annual, terrestrial.
Second glume developed.
Rachis extending beyond the uppermost spikelet; second glume and sterile lemma not loose.
Plants in low dense mats. Foliage pilose 4. P. pygmaeum.
Plants not in mats.
Spikelets 2 to 2.2 mm. Jong, greenish; axis 2 to 2.5 mm. wide.
5. P. prostratum.
Spikelets not more than 1.8 mm. long, whitish; axis less than 2 mm. wide.
"Contributed by Agnes Chase.
HITCHCOCK—GRASSES OP CENTRAL ANDES 435
Spikelets distinctly hollowed on the flat side with raised mar- gin ; culms decumbent and branching—2. P. penicillatum.
Spikelets not hollowed; culms erect, simple—3, P. tuberosum.
Rachis with a spikelet at its apex; second glume and sterile lemma loose.
Second glume and sterile lemma not much larger than the fruit;
rachis about 2 mm. broad 6. P. sodiroanuin.
Second glume and sterile lemma much larger than the fruit; rachis scarcely more than 1 mm. wide, or less,
Spikelets 2 mm. long, the glume and sterile lemma not fluted.
7. P. fiavum.
Spikelets 2.5 mm. long, the sterile lemma distinctly fluted, the glume slightly so 8. P. racemosum.
Second as well as first glume suppressed.
Plants very scabrous, elongate and clambering 12. P. scabxum.
Plants not or very slightly scabrous.
Culms commonly 1 meter or more long; spikelets 2.3 to 2.5 mm.
long 9. P. candidum.
Culms commonly not more than 50 cm. long; spikelets not over 2 mm. long.
Culms vinous-purple or purple-tinged; sheaths glabrous or nearly so 10. P. depauperatum.
Culms pale stramineous; sheaths pilose 11. P. lineispatha.
Spikelets silky. Rachis brightly colored, membranaceous; spikelets clothed with long silky hairs; perennials.
Rachis more than 5 mm. wide; spikelets solitary.
Blades 5 to 8 mm. wide 14. P. ceresia.
Blades not more than 3 mm. wide 15. P. stellatum.
Rachis 1 mm. or less wide; spikelets or some of them paired.
Spikelets pale; glume and sterile lemma 5-nerved, both long-ciliate; blades less than 5 mm. wide 19. P. polyphyllum.
Spikelets purplish to tawny; glume and sterile lemma 3-nerved, only the glume long-ciliate; blades commonly more than 10 mm. wide.
Racemes spreading or drooping, more than 5 cm. long; spikelets with a conspicuous fringe of long silky hairs.
Blades stiffly pilose, at least on the margins; racemes mostly 2 to 5, spreading 16. P. humboldtlanum.
Blades glabrous or nearly so; racemes mostly 8 to 16, drooping.
17. P. buchtienil.
Racemes narrowly ascending, less than 5 cm. long; spikelets with a soft inconspicuous fringe .—18. P. soboliferum.
Rachis not winged, or if narrowly winged not foliaceous nor broad and mem- branaceous with silky spikelets.
Fertile lemma strongly ridged; spikelets concavo-convex. Both glumes sup- pressed. (Subgenus Anachybis.)
Blades velvety beneath; rachis sparsely pilose; spikelets 1.7 to 2 mm. long (mostly less than 2 mm,) S3. P. malacophyllum.
Blades glabrous; rachis glabrous; spikelets 2 to 2.2 mm. long.
54. P. boliviense.
Fertile lemma not ridged, spikelets generally plano-convex; second glume normally developed.
Fruit scarcely indurate, pointed; spikelets with long silky white hairs on the margin. (Subgenus Moenchia) 55. P. saccharoides.
CONTRIBUTIONS FBOM THE NATIONAL HERBARIUM
Fruit mostly strongly Indurate, if relatively thin, spikelets not long-silky (Subgenus Opistheon. )
Racemes 2, conjugate, or approximately so, at the summit of the culm, rarely a third below, Spikelets solitary.
Plants annual, tufted, not stoloniferous.
Spikelets orbicular, bearing globular hairs 32. F. multicaule.
Spikelets obovate, glabrous 32A. P. pictum.
Plants perennial, stoloniferous or creeping.
Spikelets elliptic or narrowly ovate, not silky around the margin.
Second glume and sterile lemma glabrous 20. P. vaginatum.
Second glume pubescent 21. P. distichum.
Spikelets suborblcular or nearly as broad as long.
Spikelets sparsely silky around the margin, about 1.5 mm. long.
88. P. conjugatum.
Spikelets glabrous, 2.5 to 3 mm. long 39. P. notatum.
Racemes 1 to many, racemose or fasciculate, not conjugate.
Inflorescence a large flabellate panicle of numerous racemes; spikelets solitary 50. P. fasclculatum.
Inflorescence not flabellate, or if slightly so, spikelets in pairs.
Racemes solitary (rarely 2 in no, 52); spikelets in pairs.
Spikelets densely white-woolly 52. P. ekmanianum.
Spikelets glabrous. First glume developed on at least one of each pair of spikelets.
Plants creeping; spikelets 1.5 mm. long 26. P. decumbens.
Plants not creeping; spikelets about 2.5 mm. long_51. P. pilosum.
Racemes 2 to many (or solitary in axillary inflorescences).
Spikelets suborblcular or broadly ovate, not more than 2 mm.
long; fruit pale.
Spikelets (tubescent with short crisp hairs, In pairs. Culms erect or suberect.
Spikelets not more than 1.7 mm. long, brownish.
Sterile lemma pubescent; spikelets rounded at apex, 1.2 to 1.4 mm. long 29. P. paniculatiun.
Sterile lemma glabrous; spikelets slightly abruptly acutish, 1.6 to 1.7 mm, long 30. P. juergensii.
Spikelets 2 mm. long, yellowish 31. P. tenellum.
Spikelets glabrous.
Plants creeping; spikelets solitary.
Spikelets about 1 mm. long 36. P. orbiculatum.
Spikelets about 1.8 mm. long 37. P. haenkeanum.
Plants erect, robust; spikelets In pairs.
Rachls scarcely pilose; spikelets 2 to 2.2 mm. long.
45. P. miUegrana.
Rachis densely pilose; spikelets 1.8 to 2 mm. long.
46. P. densum.
Spikelets elliptic to ovate or obovate, if approaching suborblcular the fruit dark brown.
Fruit pale.
Spikelets 1.2 mm. long 33. P. gosslpinum.
Spikelets 2 mm, or more long.
Glume and sterile lemma loose, more or less rumpled, glabrous; spikelets solitary. Rachis 1 to 2 mm. wide.
HITCHCOCK—GRASSES OF CENTRAL ANDES 437
Rachls finely pubescent, especially on the Inside; blade*
densely grayish-villous 23. P. bonplandianum, Rachis glabrous or obscurely puberulent; blades puberu-
lent.
Spikelets 2.1 to 2.3 mm. long; rachls 1.6 mm. wide.
24. P. pilgerianum.
Spikelets 2.5 to 3 mm. long; rachls 2.5 to 3 mm. wide.
25, P. pallidum.
Glume and sterile lemma not loose and rumpled; spikelets paired.
Rachls with very narrow margins, 0.8 to 2 mm. wide.
Plants glabrous; racliis flat; inflorescence terminal only, Spikelets abruptly and minutely pointed.
22. P. lividum.
Plants with more or less puberulent to velvety foliage;
rachls with upturned margins; Inflorescence ter- minal and axillary.
Culms 45 to 85 cm. tall; blades puberulent to glabres- cent 27. P. inconstans.
Culms 20 to 45 cm. tall; blades densely velvety- pubescent on both surfaces 28. P. lepidum.
Kachis not at all winged.
Spikelets on relatively long pedicels, loosely arranged in splendor racemes In open pyramidal panicles.
Plants annual; second glume and sterile lemma equal, covering the fruit 34. P. microstachyum.
Plants perennial; second glume about half as long as the fruit and sterile lemma 35. P. inaequivalve.
Spikelets subsessile, imbricate.
Spikelets pubescent. Racemes few to several; blades flat.
Blades mostly not more than 1 cm. wide, scarcely wider than the sheath at base; spikelets more than 3 mm. long 49. P. remotum.
Blades 1 to 2.5 cm. wide, broadly rounded and wider than the sheath at base; spikelets not more than 3 mm. long.
Racemes spreading, rather distant; spikelets 2.5 mm. long 47. P. macrophyllum.
Racemes ascending, approximate; spikelets 2.8 to 3 mm. long 48. P. baiclayi.
Spikelets glabrous.
Rachls scarcely pilose; spikelets 2 to 2.2 mm. long.
45. P. millegrana.
Racbis densely pilose; spikelets 1.8 to 2 mm. long.
46. P. densum.
Fruit brown.
Spikelets 3 mm. long; fruit not shining; plants robust, com- monly 2 meters tall 44. P. virgatum, Spikelets 2 to 2.5 mm. long, strongly plano-convex; fruit dark
and shining; plants rarely more than 1 meter tall.
Plants annual; spikelets 2 mm. long.
40. P. melanospermum.
438 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM
Plants perennial; splkelets about 2.5 mm. long.
Sterile lemma finely undulate Inside the slightly raised margin, glabrous 41. P. plicatulum.
Sterile lemma not or very obscurely undulate, appressed pubescent.
Blades densely pubescent beneath, long-pilose above.
42. F. publfolium.
Blades ciliate and with long hairs at the very base, otherwise glabrous 43. P. collinum,
1. Paspalum repens Berg. Act. Helv. Phys. Math. 7: 129. pi. 7, 1772.
Ceresia fluitans Ell. Bot, S. C. & Ga. 1: 109. 1810.
Paspalum fluitans Kunth, R6v. Gram. 1: 24. 1829.
An aquatic or subaquatic perennial, with submerged stems and floating branches buoyed up by the inflated sheaths, thin Hat blades, and panicles of numerous spreading racemes, the small flat elliptic whitish splkelets in 2 rows on the broad green rachis.
In sluggish streams or standing water, southeastern United States to Ecuador and Paraguay. Originally described from Dutch Guiana.
EcuADOE: Balao, Eggers 14632; Jameson 540.
2. Paspalum penicillatum Hook. f. Trans. Linn. Soc. 20: 171. 3Sol.
A decumbent branching annual, with ascending flowering culms 15 to 40 cm. long, flat lax blades mostly 3 to 10 cm. long and 6 to 12 mm. wide, and panicles of several to many spreading racemes 10 to 20 mm. long, commonly In pairs, the whitish splkelets about 1.7 mm. long.
Shaded places on moist slopes and in cultivated ground. Ecuador, Peru, and Bolivia. Described from Charles Island, GalSpago.?
Ecuador: Quito, Holirny 909. Cotocollao, MilleZOZ, 303 Vi. Ambato, Pachano 15. Riobamba, if (lie 58. Huigra, Rose 24010. "Andes," Spruce 5043.
Peru: Cutervo, JeUki 407. Tamblllo, Jelski 582.
Bolivia: Sorata, Rusby 240; Bang 1310; Holway 507%. Sirupuya. Buch*
tien 417. Villa Aspiazu, Holway 697. La Florida, Hitchcock 22612, 22643.
Part of Mille's no. 303 (which we have numbered 303*4) has sparsely pilose foliage, and Holway's no. 507% rather copiously pilose foliage.
3. Paspalum tuberosum Mez, Repert. Nov. Sp. Fedde 15: 29. 1917.
An erect perennial (?), branching at the base, the slender culms 12 to 28 cm.
tall, leafy toward the base, the foliage pilose to glabrescent, the blades 4 to 5 mm. long and about 3 mm. wide, the panicle 3 to 4 cm. long, with 4 to 9 ascending to spreading racemes, the pale splkelets about 1.7 mm. long.
Probably in moist or muddy places.
Known only from Weberbauer 3815 from San Pablo, and Webcrbatter 3932 from San Miguel, Dept. Cujamarca, Peru, both numbers being cited with the original description. Both collections were examined in the herbarium of the Berlin Botanical Museum. The species is described as perennial, but the bases of the plants are matted with dried mud and vegetation, with nothing tuberous evident. All the allied species are annuals and it seems probable that this also Is annual.
4. Paspalum pygmaeum Hack. Repert. Nov. Sp. Fedde 11: 18. 1912.
Paspalum minimum Meyen, Rels. En I. 1: 484. 1834, name only. (Mara villas, Meyen; dwarf plants.)
Paspalum haenkeanum var. minimum Nees, Act. Aead. Caes. Leop. Carol. 19:
Suppl. 1: 6.1841; 138.1843-
Paspalum pygmaeum var. glahresccns Hack. Repert. Nov. Sp. Fedde 11: 18.
1912. (Buchtien 2490.)
HITCHCOCK—GRASSES OP CENTRAL ANDES 439
A low annual, branching at the base and forming mats, with spreading culms 2 to 10 cm. long, the ends ascending from strongly geniculate nodes, pilose foliage, the blades rarely more than 3 cm. long, and small panicles of 3 to 6 racemes, mostly less than 12 mm. long, commonly equaled or exceeded by the uppermost blades; splkelets 1.7 to 1.9 mm. long.
Open ground on high plateaus, Peru and Bolivia. (Type, Buchtien 850.)
Pebu: La Quinhua, Macbride & Feather stone 2030. Rio Blanco, Macbride
<£• Featherstone 804. PuearS., Weberbauer 415. Mara villas, Meyen. Tamblllo, Jelski 582. Southern Peru, Weddell 4423, 4490.
Bolivia: La Paz, Buchtien 859, 2490. Pongo, Hitchcock 22772. Talca Chu- giagulllo, Bang 808.
In Macbride & Featherstone's no. 2030 the splkelets are 2 mm. long.
5. Paspalum prostratum Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 34:
9. 1900.
Resembles both P. peniciUa tum, than which it is stouter and larger leaved, and P. candidum/ from the latter it is distinguished by the greenish splkelets with the second glume developed.
Moist slopes at middle and higher altitudes, southern Mexico to Bolivia.
Originally described from Mexico.
Bolivia: Sorata, Hoi way 507.
6. Paspalum sodiroanum Hack. Oesterr. Bot. Zeltschr. 51: 237. 1901.
Paspalum peruvianum Mez, Repert. Nov. Sp. Fedde 15: 28. 1917. (Weber- batter 137.)
A decumbent branching annual, with culms commonly 1 meter or more long, flat lax blades 7 to 18 cm. long and 7 to 12 mm. wide, and oblong panicles of numerous approximate ascending racemes 1 to 4 cm. long, the splkelets 2 mm.
long, the sterile lemma loose and rumpled, the terminal spikelet purple.
Moist shaded places, at middle altitudes, Colombia to Peru. Originally described from Ecuador, the type collected by Father Sodiro in 1886 at 2,000 meters, locality not given.
Ecuador : Niebll, Sodiro in 1882. Without locality, Sodiro in 1886.
Pebu : Between Tain bo de Viso and Chaupichaca, Weberbauer 137.
7. Paspalum flavum Presl, Rel. Haenk. 1: 220. 1830.
Paspalum cristatum Trin. M&». Acad, St. Pfetersb. VI. Sci. Nat. 1: 152. 1834.
Paspalum mollendense Mez, Repert. Nov. Sp. Fedde 15: 31. 1917. (Weber- bauer 1553; an exceptionally robust specimen with panicles 15 to 18 cm.
long.)
A glabrous annual, branching at the base, with culms 20 to 55 cm. long, loose sheaths and thin flat blades mostly 5 to 10 cm. long and 5 to 10 mm.
wide, and oblong panicles 5 to 18 cm. long and 1.5 to 2 cm. wide, of numerous approximate arching racemes 8 to 20 mm. long, the splkelets about 2 mm.
long, stramineous to dark purple, the glumes and sterile lemma larger than the fruit, thin and loose, the rachls scarcely 1 mm, wide, commonly appearing narrower because of the in rolled margins.
Probably in moist places (no habitat is given with any of our specimens), on the Pacific slope, Peru and Chile. Originally described from unknown locality.
Pebu: Obrajlllo, Wilkes Ex pi. Exped. Lima, Dombey. Matucana, Macbride
& Featherstone 135. Mollendo, Weberbauer 1553. Without locality, Sepne;
Pavdn.
8. Paspalum racemosum. Lam. Tabl. Encycl. 1: 176. 1791.
Paspalum stoloniferum Bosc, Trans. Linn. Soc. 2: 83. pi. 16. 1794. (Peru.) Milium latifolium Cav. Icon. PI. 3: 37. pi. 273. 1794. (Peru.)
440 CONTRIBUTIONS FROM THE NATIONAL HERBABIUM
Paspalum purpureum Ruiz & Pav, Fl. Peruv. Chil. 1: 47. 1798. (Peru.) Paspalianthum stoloniferum Desv. Opusc. 59. 1831.
Hatellla stolonifera Sclilecht. Bot. Zeit. 8: 605. 1850.
Paspalum biglume Steud. Syn. Pi. Glum, 1: 24. 1854.
Paspalum manabiense Mez, Repert. Nov. Sp, Fedde 15: 30. 1917. (Eggers 14965, n small specimen with pale spikelets,)
A glabrous annual, with sparingly branching culms decumbent and rooting at the lower nodes, commonly 60 to 100 cm. long, loose sheaths, thin flat blades usually 3 to 12 cm. long and 1 to 2.5 cm. wide, rounded to subcordate at base,
and oblong panicles 5 to 15 cm. long and 1.5 to 3 cm. wide, of numerous approximate, ascending to spreading racemes 1 to 2.5 cm. long, the rachis about 1 mm. wide, the spikelets about 2.5 mm. long, commonly purple to rusty brown, but sometimes pale, the glume and sterile lemma much longer than the fruit, thin, loose and finely fluted.
In recently disturbed soils, fields, waste places, and roadsides, spreading or clambering among brush, Colombia to Peru. Originally described from Peru.
Ecuador: El Recreo, Eggers 14965. Perucho, Sodiro without number.
Huigra, llolway 823; Hitchcock 20341; Rose 22162, 24017, 24022, 24025. Hua- taxi, Spruce, 5959 (Kew Herb.). Guayaquil, Anthony <0 Tate 79; Hitchcock 19955, 20132, 20134.
Peru: Lima, Hitchcock 22338; Wilkcs ExpL Exped.; Cuming 1054; Mathews 425, 426 (last three numbers in Kew Herb.). Santa Clara, Rose 1 $742.
" Callao et Lima," Didrichson 4887.
6. Paspalum candidum (Humb. & Bonpl.) Kunth, M6m. Mus. Hist. Nat. 2:
68. 1815.
Reitnaria vandida Humb. & Bonpl.; Fliigge, Monogr. Pasp. 214. 1810.
Paspalum candidum Kunth. M&n. Mus. Hist. Nat. 2: 68. 1815.
Paspalitm confertum Willd.; Steud. Nom. Bot. ed. 2. 2: 270. 1841.
Paspalum uniseriatum Steud.; Lech I, Berb. Amer. Austr. 55. 1857, name only.
(Lechler 1862,)
A loosely branching annual, with culms commonly more than 1 meter long, decumbent at base, straggling or clambering in brush, smooth to slightly scabrous sheaths, thin, flat, softly pilose blades 5 to 14 cm. long, and 5 to 12 mm. wide, commonly much smaller on the branches, and loose panicles 5 to 12 cm. long, of 8 to 20 ascending or arched spreading racemes 2 to 4 cm, long, the rachis 2 to 2.5 mm. wide, the white oblong spikelets 2.3 to 2.5 mm.
long, commonly so far apart as to appear to be in a single row, not appressed, but more or less spreading from the rachis.
In moist places and recently disturbed soils, roadsides and along hedges, southern Mexico to Bolivia. Originally described from "Puanbo" [Puembo], Ecuador (Bonpland).
Bouadob: Quito, Heilbom 530. Chillo, Sodiro 300. Nono, Sodiro in 1837.
Huigra, Rose 22582. Las Juntas, Rose 23210. Cumbe, Rose 22957.
Peru: Obr&jillo, Wilkes Expl. Exped. Mito, Macbride rf Featherstone 1366.
Machu Picchu, Cook d Gilbert 858. Without locality, Lechler 1862; Ileyne.
Bolivia: San Felipe, Hitchcock 22597.
10. Paspalum depauperatum Presl, Rel. Haenk. 1; 215. 1830.
Paspalum vinosum Mez, Repert. Sp. Nov. Fedde 15; 28. 1917. (Sirupaya, Buchtien. The date and other data of the type specimen agree with those of Buchtien 422.)
Resembling P. candidum, but the culms shorter, purplish, decumbent with erect branches; nodes densely pubescent; sheaths smooth; blades velvety
HITCHCOCK—GRASSES OF CENTRAL ANDES 441
beneath and finely papillose-pubescent above, on the average smaller than in p. candidum; panicles shorter, purple-tinged; spikelets about 2 mm. long.
In brushy borders, Venezuela and Colombia to Bolivia. Originally described from Hufinuco, Peru, the type specimen collected by Haenke.
Ecuador : Alausl, Hitchcock 20723. Portovelo, Hitchcock 21206.
Pebu: Huilnuco (?), Ruiz 4620, Bolivia: Sirupaya, Buchtien 422.
Hitchcock's no. 20723 has stouter culms and broader blades than the other specimens and rather dense panicles of few to numerous racemes; some of the panicles are conspicuously vinous-purple.
11. Paspalum. lineispatha Mez, Repert. Nov. Sp. Fedde 15: 27. 1917.
Resembling P. candidum, but much smaller, the weak to delicate, decumbent culms 10 to 30 cm. long; sheaths and blades softly pilose; panicles 1.5 to 3 cm.
long, of 2 to 12 spreading racemes 1 to 1.5 cm. long, the rachis about 1.5 mm.
wide; spikelets about 1.8 mm. long. Closely related to P. depauperatum, differing in the pale weak culms, pilose sheaths, smaller pale panicles, narrower rachis, and smaller spikelets.
Probably in moist shaded places (no habitat given on either specimen seen), at middle and upper altitudes, Peru and Bolivia. Originally described from Peru; type, Weberbauer 3142. The locality published is "infra Hacienda Cajfibamba, Samanco inter et Casaz, Dept. Ancachs, alt. 3000-3500 M," Doubt- less Caraz, Dept. An cash, is meant; the altitude indicates a locality well up in the Cordillera.
Peru: Caraz, Weberbauer 3142.
Bolivia: Hacienda Casano, Buchtien 7112.
12. Paspalum scab rum Sci'ibn. U. S. Dept. Agr. Div. Agrost. Bull, 4: 36. pi. 3.
1897.
A straggling annual, very scabrous throughout, with elongate, divergently branching, sometimes vinous-purple culms, clambering over shrubs, thin flat scabrous-liispid blades 5 to 10 cm. long and 10 to 18 mm. wide, tapering to both ends, and pale panicles 12 to 20 cm, long of numerous subverticillate spreading racemes 1.5 to 5 cm. long, the rachis acuminate, the white spikelets about 1.8 mm. long.
Brushy slopes, Guatemala to Ecuador. Originally described from Guatemala.
Ecuador : Guayaquil, Hitchcock 19948. Milagro, Hitchcock 20274.
13. Paspalum crassum Cluise in Hitchc. Contr. U. S. Nat. Herb. 17: 239. 1913.
A coarse erect annual 35 to 100 cm. or more tall, branching from the base, with coarsely papillose-hirsute foliage, the flat blades 11 to 25 cm. long and 15 to 25 mm. wide, tapering to a rounded base; panicle of 4 to several pale thick ascending racemes, on a narrowly winged axis, the rachis 3 to 4 mm.
wide, tapering to a narrow summit, the margins hispidulous; spikelets soli- tary (or a few paired about the center of the raceme), crowded, oval, turgid, about 3.5 mm. long, blunt, pale, glabrous, the first glume developed as a minute thick bractlet or obsolete, the second glume and sterile lemma subindufate, equal.
Along ditches and in moist open ground, Mexico and Peru. Originally described from Mexico; the type specimen, from Colima, is much taller than the Peruvian specimen and the blades are as much as 60 cm. long.
Peru: Colonia Perenfi, Hitchcock 22076.
i
14. Paspalum ceresia (Kuntze) Chase in Niles, Contr. U. S. Nat. Herb. 24:
153. 1925.
Paspalum membranaceum Lain. Tabl. Encycl. 1: 177. 1791. Not P. mem*
branacettm Walt. 1788.
442 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM
Ceresia elegans Pers. Syn. PI. 1: 85. 1805.
Ceresia membranacea Beauv. Ess. Agrost. 9, 171. pi. 5. f. 4- 1812.
Paspalum elegana Roem. & Scbult. Syst. Veg. 2 : 290. 1817, Not P. elegans Fltigge 1810.
Panicum ceresia Kuntze, Rev. Gen. PI, 3s: 360. 1898.
An erect perennial, densely villous at the base, with culms in tufts from a short rhizome, sometimes one or two culms with a decumbent lower joint root- ing at the node with a knoblike cluster of villous scales, glaucous foliage, the flat blades mostly 5 to 15 cm. long and 3 to 8 mm. wide, usually stiffly pilose on the upper surface near the margin, and 1 to 4 ascending to arching racemes rather distant on a very slender axis, the ribbonlike rachis purplish or bronze- green with bright yellow-brown margins and crowded silvery-silky spikelets, the hairs exceeding the spikelets and obscuring them.
Open, rather dry, rocky slopes, at middle altitudes, Ecuador, Peru, and Bolivia. Originally described from Peru.
Ecuador : Between Loja and San Lucas, Hitchcock 21491.
Pebu : Mito, Macbride & Featherstone, 1780. Without locality, Ruiz 4621;
Pavdn.
Bolivia r Sorata, Mandon 1255 (1755?). Cochabambn, Hitchcock 22825.
Charagua, Hersog 1210. Buena Vista, Steinbach 5421. Bolivian plateau, Bang 1080.
15. Paspalum stellatum Humb. & Bonpl. in Fliigge, Monogr. Pasp. 62. 1810.
A tufted erect perennial with narrow subinvolute hirsute blades and simple wiry culms 25 to 50 cm. tall, the solitary (or rarely paired) arcuate racemes 5 to 10 cm. long, the ribbonlike rachis golden-brown, the glistening white hairs of the spikelets stellately spreading at maturity.
Open dry slopes in the uplands, southern Mexico to Argentina. Originally described from Colombia.
Bolivia: Buena Vista, Steinbach 7103.
16. Paspalum humboldtianum Fltigge, Monogr. Pasp. 67. 1810.
Paspalum ciliatum H. B, K. Nov. Gen. & Sp. 1: 87. ph 2.}. 1816. Not P. ciU- atum Lam. 1791.
#
Paspalum blepharophorum Roem. & Scliult. Syst. Veg. 2: 292. 1817.
Panicum humboldtianum Kuntze, Rev. Gen. PI, 3*: 361. 1898.
A tufted perennial, with culms commonly 50 to 80 cm. tall, erect from a woody decumbent base, usually branching from the lower nodes, leafy toward the base with overlapping sheaths and spreading blades, the sheaths and blades papillose-pilose, the Arm flat sharp-pointed blades 8 to 18 cm. long and 8 to 15 mm. wide; racemes 2 to 5, ascending or spreading, lax, 5 to 10 cm. long, the rachis dull purple, the crowded purplish spikelets glistening with long white silky hairs, but hardly obscured by them.
Stony open or brushy slopes in the highlands from Mexico to Argentina.
Originally described from Puembo, Ecuador (Bonpland).
Ecuador: Quito, Harteman 65. Ambato, Hitchcock 21710. Huigra, Rose 22639. Between Huigra and Naranjapata, Hitchcock 20656. Portovelo, Rose 24027; Hitchcock 21306.
Peru: Chosica, Holxcay 782; Macbride <t Featherstone 517. Ollantaytambo, Hitchcock 22485.
BOLIVIA: Sorata, Rusby 205. Cotafia, Buchtien 3125. lllimanl, Julio 44.
Cochabamba, Hitchcock 22795, 22830. Buena Vista, Stein bach 6644. Rio Cuchi, Steinbach 6618, Without locality, Bang 2590.
17. Paspalum buchtienii Hack. Repert. Nov. Sp. Fedde 6: 153. 1908.
Resembling P. humboldtianum, but on the average taller and somewhat straggling, with larger blades not crowded at base and mostly glabrous on