PROCEEDINGS

Vol. 34, pp.43-46

March

31,1921

PROCEEDINGS

OFTHE

BIOLOGICAL SOCIETY OF WASHINGTON

NEW ^{TREES AND SHRUBS FROM YUCATAN.}

BY

^{S. F.}

BLAKE.

The

descriptions^of

the

_following

new

species of

woody plants from Yucatan, made _by the

writer several

years

ago, are

pub- Ushed here

in

order that the names may ^be

^availablefor

^use

ⁱⁿ

the work on "Trees and Shrubs

^of

Mexico," by Mr. ^{Paul C.}

Standley

^of

the U.

S.

National Herbarium, now

in

course

of publication.

Acacia dolichostachya Blake, sp.nov.

Shrub5meters_high;stem unarmed,glabrous, the older branchlets weakly-

armed

withtiny induratestipules, theyounger minutelyappressed-puberu- lous;upper^leaves(immature)bipinnate, 3^{to 3.5}cm.long includingpetiole;

stipules 0.7 to¹

mm.

_long,subulate,straight,at length indurated^ordecidu- ous;petiole 1.5 to 2.2cm._long,sparsely puberulous, bearingbelowthemid- dlea conspicuous oval^orroundish gland ¹

mm.

long;rachis 1.3 to 1.5cm.

long,bearinganapicalgland;pinnae⁵pairs,2to2.5cm._long,puberulous especially at thebaseof theleaflets; leaflets24 to29pairs, linear-oblong, 3.5

mm.

long, 0.5

mm.

wide, or smaller,obtuse,truncate-rounded _{at base,} inequilateral,^ciliolate,otherwise glabrous; spikescylindric, numerous,^axil- lary, erect, 3 to 3.5cm._long, about6

mm.

_thick, therachisstrigillose;pe- duncle 3

mm.

long; flowers rather loosely spicate, 3

mm.

long (including the stamens); bracteoles curved,yellowish, 0.5

mm.

long, persistent;calyx turbinate, broadly truncate at base, strigillose, 0.6

mm.

long, 5-lobedfor

X

^{itslength, the lobesdeltoid, obtusish; corolla (indriedspecimen) pale}

yellowish, 1.5

mm.

long,strigillose, 5-lobed nearly^tothe middle, the lobes ovate, acutish;stamens30,withfree filaments,surpassing thecorolla, the anthercells elliptic;ovaryshort-stiped,glabrous, ¹¹-ovulate;stylecurved.

Type

^{inthe herbarium of the Field}

Columbian Museum,

^No. 446,819, collectedat Las Bocas, Silam,Yucatan,

May,

1916,

by

^{G. F.}

Gaumer &

Sons(No.23,329).

Thisspeciesbelongs^tothegroupNudiflorae^ofthesecondsubseriesofthe Vulgares, ^as treated

by Bentham.

^Itsnearestally ^isA. coulteri Benth.,

from

which ^itdiffersintheshorter_spikes, smallerflowerswith abouthalf

6—

Proc.^Biol.Soc. Wash., Vol.34, 1921. (43)

44 Proceedings

of^theBiological Society of

Washington.

the

number

ofstamensofA. _coulteri,andparticularlyⁱⁿthe persistence^of the bracteolesontherachis ofthe spikes^afterthefalloftheflowers.

AcaciagaumeriBlake, sp.nov.

Tree8meters high; stem_glabrous, belowthe_stipules

armed

withfirm, retrorse,broad-based, blackishpricklesabout4

mm.

long, as well asafew very^smallstraight prickles;

young

branchlets spreading-pilosulous; leaves bipinnate, 4^{to 4.5}cm.long includingpetiole;stipulessubulate,deciduous, 1

mm.

long; petiole 1.5 to2 cm. _long, canaliculate, subglabrous, bearing belowthemiddlean_{oval gland}1

mm.

long;^{rachis 2.5}cm._long,3-canalicu- late, pilosulous ⁱⁿ the grooves, unarmed, sometimes with ^a single apical gland;pinnae⁴pairs, 4to5cm._long, narrowly oblongin outline,theaxes pilosulous;^leaflets 9to 16_pairs, oblong, 8 to 11

mm.

long, 2.5 to 4

mm.

wide,inequilateral,roundedortruncate-roundedatapex,^atbase truncate- rounded andoblique, beneathslightly paler, sparselyappressed-pubescent on bothsides;spikesvery numerous,fascicled, axillary

and

_terminal,form- inganovoidnakedpanicle 9^to16cm.wide, the axes spreading-pilosulous;

ultimate peduncles 8^to15

mm.

_long,pilosulous,usually bearingtwolinear- lanceolate, alternate bracteoles about 1.3

mm.

long; spikes rather dense, oblong-cylindric, ^{1 to 1.4}cm._{long, 6.5}

mm.

indiameter(including thesta- mens),the bracteoles deciduous; calyx turbinate,roundedat base, 1.5

mm.

long, spreading-pilosulous below the _teeth, 5-lobed _{for f} its length, the lobes_deltoid,acutish;^corolla

when

_{drypaleyellowish,}2

mm.

_long,5-lobed to middle, pubescent below ^the tip of the lobes with subappressed ^hairs, the lobes ovate, acutish, densely^ciliate with subglandularhairs; stamens aboutISO,

some

_free,

some

irregularlyfasciculate-connate atbase ortothe middle,^2.8

mm.

long;ovary withslender glabrousstipe,about11-ovulate, rather denselylong-pilose.

Type

^{in the herbarium of the Field}

Columbian Museum,

^No. 446,825, collected three miles inlandfrom Silam, Yucatan,

May,

^1916,

by

^{G. F.}

Gaumer &

^Sons (No. 23,332).

A member

of the Americanae Spiciflorae, as the genus ^is arranged

by Bentham.

Diospyros anisandraBlake,sp.nov.

Dioecious shrub,3meters_high;stemglabrous; leavesalternate, crowded at the _{tips of}the branches;petioles ¹ to2

mm.

_{long,sparsely}puberulous;

blades obovate, ^{2.5 to 4.3} cm. long, 1.2 to 2.3 cm. wide, retuse at apex, cuneateat_base, shiningabove, beneathslightly paler, glabrous except^for a fewhairs at base ofblade on upper side, chartaceous-membranaceous, slightlyveiny, the^lateralveins4to6_pairs;staminateflowers1or2,axillary onthe

young

branchlets, pendulous on pedicels ¹ to 1.5

mm.

long; calyx funnelform, 4

mm.

_long,glabrous outside, the 4 lobes lanceolate, 1.5

mm.

long, acuminate, recurved, 3-ncrved, within spreading-puberulous below the apex;corolla urccolate, "yellow," glabrous, 14

mm.

long, the tube 7

mm.

_long,the 4 lobeslanceolate,7

mm.

long,spreading,acuminate; stamens glabrous,connateatextroinc_base,alternntely longerandshorter,the longer 4

mm.

long(filaments2_nun.,anthers 2_mru.),theanthers obliquely cordate

Blake — _New

Trees

and Shrubs from ^Yucatan. 45

at_base,acute at apex, the shorterstamens2.7

mm.

_long (filaments¹

mm.,

anthers1.7

mm.)

^;pistillateflowers1or2,axillaryonthe

young

branchlets, erecton_glabrouspedicels6to8

mm.

long;calyxtube_turbinate, 1.7

mm.

long, glabrous outside, appressed-pubescent within, the 4 ^lobes ovate, acute or obtuse, spreading, atapex^ciliate,atbase withinpilosulous,other- wise glabrous;

bud

subulate,veryacute;corolla urceolate,glabrous,

maroon

color, thetube4

mm.

long,the 4 lanceolateacuminatelobesabout6.8

mm.

long;pistil4

mm.

long;ovary^4-celled, witha_pilosering at base, thecells 1-ovuled;style¹

mm.

long;stigmabifid,excavated.

Type

^{intheherbariumofthe Field}

Columbian Museum,

^No.446,760,^col- lected inthe forests ofSuitun, Yucatan,

May,

^1916,

by

^{G. F.}

Gaumer &

Sons _{(No. 23,307).}

The

_pistillate plant (No. 23,308)

was

collected with the type.

A member

ofthe Section Danzleria, not_closelyrelatedto

any

^described

species.

Citharexylumtrinerve Blake,sp.nov.

Shrub 1.5meters _high,the stem minutelyhispiduloustoward_{the apex,} glabrate; leaves opposite, on ciliolatepetioles 5 to12

mm.

_long,the blades ovalorelliptic,3.2 to 5.2cm.long, 1.7 to 3.2cm.wide, obtuse oremarginu- late, not mucronate, ^at base short-cuneate,entire,chartaceous-coriaceous, above glabrous, prominulous-reticulate, beneath_{equally green, strongly} 3-nerved_slightlyabovethe_base, prominulous-reticulate, barbellateⁱⁿ the axils ofthe twolateral veins, otherwise glabrous; spikes terminal,solitary or_{in threes,}usually simple, densely flowered,about2.5cm._long,about1.6 cm. _{wide, the} peduncledensely puberulous, 8 ^to 12

mm.

long; bracts tri- angular, acute, 1.2

mm.

long; flowers subsessile; calyxsubtubular, 4

mm.

long, villous-tomentose at apex ^{in the sinus,} otherwise subglabrous, ^5- sulcate,with5shortobtusish deltoid_teeth;petalsunitedfor f their length, outsideessentiallyglabrous, thetube4

mm.

long, short-pilosewithinabove thebase, the lobes5,oblong, 5^{to 5.5}

mm.

_long,obtuse,^insidedensely bar- bate-villous; perfect stamens 4, reaching the apex ^of the tube, the ^fifth sterile; ovary^glabrous.

Type

^{in the herbarium ofthe Field}

Columbian Museum,

^No. 460,289, collectedat Xnocac, Yucatan, December, 1916,

by

^{G. F.}

Gaumer &

Sons (No. 23,502).

This_speciesisverydistinct initssmallroundishstrongly 3-nervedleaves.

Randiamillspaughiana Blake, sp. nov.

Glabrous shrub 6 meters _high, 1

dm.

_thick, the branches

armed

with stout spines 4^to9

mm.

long;leavescrowded_{at tips of}branchlets, opposite;

petioles¹to1.5

mm.

long,glabrous; bladesoval, 1.5 to 2.7cm.long, 0.9 to 1.7 cm. wide, short-pointed ^at base

and

apex, mucronulate, glabrous or sparselypuberulous beneathalong the costa, above deepgreen and some-

what

shining, scarcely paler beneath, with5 to7 _{pairs of}nerves; flowers solitary,sessile; calyx 5 to 6

mm.

_{long,glabrous outside,} thecampanulate tube4

mm.

_long (measuredtoapex^ofinnermembrane), with^apilosering

46 Proceedings

of^the Biological Society of

Washington.

insideatbase_{of throat,}the5subulate teeth 3

mm.

longfrombase;corolla salver-shaped,blackeningon drying, thetube 13 to 15

mm.

_{long, 2.5}

mm.

thick, slightlywidenedatapex, witha_pilosering insidebetween thebase

and

the stamens, the 5 lobeslanceolate, acuminate, slightlyoblique, 9 to 15

mm.

long, 5

mm.

_wide; stamens5, included, glabrous, the ^cells5

mm.

long;ovary2-celled; style 10.5

mm.

long;stigmaslightly clavate,undivided, 4

mm.

long.

Type

^{intheherbariumofthe Field}

Columbian Museum,

^No.446,691,^col- lected at

Maxcanu,

Yucatan, March, 1916,

by

^{G. F.}

Gaumer &

^Sons(No.

23,260). Additional specimens collected in

May

^are

^{numbered Gaumer}

23,227.

This_speciesisrelated toRandiaxalapensisMart.

&

Gal.,buthasa

much

larger calyx and corolla. In size of flowerit is intermediatebetween R.

xalapensis

and

R._longiloba Hemsl.

Notopteraleptocephala Blake, sp.nov.

Shrub 1.5 meters _high; stem terete, striate, gray, tuberculate-hispid- pilosewithincurvedhairs

and

puberulous; leaves opposite;petiolesdensely tuberculate-hispid-pilose,5

mm.

long;blades ovate orelliptic-ovate, 5.5 to 8.5 cm. _long, 2 to 3.5 cm. _{wide, acuminate,} at base rounded or cuneate, mucronulate-denticulate (teeth9to12_pairs), above veryharshly tubercu- late-hispidulous, beneath _paler, rather _softly and densely hispidulous- pilosulous

and

gland-dotted, reticulate-venosewithabout10pairs of lateral veins; uppermostleaves bracteiform, ^1.8to3.8 cm._long;panicles termin- ating stem

and

branches, 8cm._{wide, 4} to8cm._long,convex; bracts 3^to6

mm.

long;peduncles^{5 to}14

mm.

long;pedicels^1to4

mm.

long;heads_discoid, about26-flowered,

when young

subcylindric,^7.5

mm.

_{high, 3.5}

mm.

thick, in age^9tolO

mm.

_high,Gto 6.5

mm.

_thick;involucreabout4-seriate, 3.5 to 4.5

mm

^.high,the

phy

^Uariessubcoriaceous,strigose,the outer ovate, obtuse, glab- rate, the innerlanceolate,acute;corollas whitish,curvedor reflexed, 4.5

mm.

long (tube 2

mm.

long,ampliateat base,teeth1.2

mm.

_long);palesnarrow, carinate

and

winged, obtuse, glabrous, erose-denticulate above; achenes ovate or oblanceolate, ^{3.5 to 4.5}

mm.

long (excluding wings), blackish, glabrous, narrowly winged on^eachside; pappus

awns

2, the inner2.2

mm.

long, winged ^to apex, the wingspinose-ciliolate, the outer 1.5

mm.

_long,

ciliolate, winged ^{to the} middle (the wing subglabrous), sometimes trifid at base.

Type

^{in the herbarium of the Field}

Columbian Museum,

^No.460,238, cf)llected atXnocac, Yucatan, December, 1916,

by

^{G. F.}

Gaumer &

Sons (No.23,473).

This _{species belongs} to the Section Loxosiphon, and is readily distin- guished from

any

^other species of that group

by

^its subcylindric heads.

The

sectionalcharacter* requires a slightmodification to cover the ciliate

wings^oftheachenein this species,a featurenot_previously

known

in this section. According ^{to the} collectors' note, Notoptera leptocephala ^is re- ported^tobeused medicinally.

iSee Blake, Journ. Bot. 53: 225. 1915.