FLORA 07 THE DISTRICT OP COLUMBIA. 45
B. PISTILS HOBS THAN ONE, DISTINCT OR NEARLY SO
Calyx none. Flowers in nodding spikes; leaves cordate..SAT7BUBACEAE (p. 132).
Calyx present.
Stamens inserted on the calyx; stipules present —Aphanes (p. 177).
Stamens inserted on the receptacle; stipules none.. .BANTTNCOXACEAE (p. 156).
BB. PISTILS SINGLE, SIMPLE OR COMPOUND.
Ovary inferior or so closely invested by the calyx tube as to appear «o.
Plants aquatic, the submersed leaves finely divided.
HAXOBAGIDACEAE (p. 214).
Plants terrestrial.
Leaves opposite; flowers rose or purple, 3-5 in a broad thin involucre.
ALLIOTOACEAE (p. 149).
Leaves alternate; flowers without an involucre.
Leaves simple; flowers white, in panicles SANTALACEAE (p. 143).
Leaves pinnate; flowers in spikes Sanguisorba (p. 177).
Ovary superior.
Stipules sheathing the stem at the nodes POLYGONACEAE (p. 144).
Stipules, if present, not sheathing the stem.
Plants aquatic, submersed or growing on mud, low and delicate.
Leaves whorled, dissected; style 1 CERATOPHYLLACEAE (p. 155).
Leaves opposite, entire; styles 2 CALXJTBICHACEAE (p. 197).
Plants not aquatic.
Styles 10. Berry 10-aeeded; flowers in racemes.
PHYTOLACCACEAE (p. 150).
Styles (if present) and stigmas 1-3.
Leaves palmately lobed or divided Cannabis (p. 142).
Leaves not palmately lobed.
Ovary 3-celled EUPKORBIACEAE (p. 194), Ovary 1-2-celled.
Ovary 2-celled; flowers in racemes. Pod 2-seeded, circular, flat.
Lepidium (p. 166).
Ovary 1-celled; flowers not in racemes.
Leaves with branched hairs beneath Crotonopsis (p. 195).
Leaves without branched hairs.
Stipules present.
Flowers unisexual; leaves toothed {except Parietaria),
TTRTICACEAE (p. 142).
Flowers perfect; leaves entire CORRIGIOLACEAE (p. 150).
Stipules none.
Perianth and bracts scarioue AMARANTH ACEAE (p. 148).
Perianth and bracts (if present) herbaceous, not scarious.
CHENOPOD1ACEAE (p. 147).
A A, Petals present.
Pistils more than 1, distinct (inclosed in a fleshy receptacle in Rosa),
Stamens inserted on the calyx (hypanthium) ROSACEAE (p. 173).
Stamens inserted on the receptacle.
Stamens united in a column by their filaments MALVACEAE (p. 202).
Stamens distinct.
Plants succulent. Stamens twice as many as the petals; follicles many- seeded CRASST7LACEAE (p. 171).
Plants not succulent.
Plants woody.
Plants climbing; leaves peltate MENISPERMACEAE (p. 161).
Plants not climbing; leaves not peltate.
Stipules encircling the stem, deciduous but leaving a ring on the twigs MAGNOLIACEAE (p. 161).
Stipules none ANNONACEAE (p. 161).
Plants herbaceous.
Sepals and petals 3.
. Plants aquatic CABOMBACEAE (p. 155).
Plants terrestrial UMNANTHACEAE (p. 198).
Sepals and petals 4 or 5.
Carpels distinct RANTJNCtTLACEAE (p. 156).
Carpels united at base,
. Pistil 5-lobed GEBANIACEAE (p. 190).
Pistil 2-lobed SAXIFBAGACEAE (p. 171).
Pistil single.
Leaves punctate with translucent dots.
Leaves simple; herbs or low shrubs; fruit a capsule.
HYPERICACEAE (p. 204).
FLORA OF THE DISTRICT OF COLUMBIA. 47
Leaves trifoliolate; a tall shrub; fruit a winged nutlet BUTACEAE Leaves not punctate.
0, Plants woody.
Plants climbing.
Tendrils present VITACEAE Tendrils none.
Stems twining; leaves simple Celastrus Stems climbing by rootlets; leaves compound. . Toxic odendron Plants not climbing.
-Leaves opposite.
Leaves compound.
Leaves pinnate, with 5 or more leaflets Fraxinus Leaves 3-foliolate STAPHYLEACEAE Leaves simple.
Fruit fleshy, indehiecent.
Flowers in cymes; stone 2-celled COBNACEAE Flo n in pan cles; stone 1-celled OLEACEAE Fruit dry (aril fleshy in Euonymm),
Ovary 2-celled.
Fruit a pair of asymmetric samaras; leaves lobed or compound.
ACEBACEAE (p. 200).
Fruit a capsule; leaves not lobed..HYDBANGEACEAE (p. 172).
Ovary 4-celled; fruit a 4 (3-5) -celled capsule, the aril red.
Euonymus (p. 19D).
Leaves alternate.
Pistil a single carpel, forming in fruit a 1-celled pod.
Corolla papilionaceous FABACEAE (p. 181).
Corolla not papilionaceous, the odd petal inside the others, nearly regular except in Cercis CAESALFINIACEAE (p. 180).
Pistil compound, consisting of more than 1 carpel.
Leaves compound.
Plant prickly: ABALXACEAE (p. 215).
Plants not prickly.
Ovary 2-5-parted, each part becoming in fruit a samara.
SIMABOUBACEAE (p. 193).
Ovary entire; fruit a slightly fleshy drupe.
ANACABDIACEAE (p. 198).
Leaves simple.
Stamens more than 10.
Fruit a globose nut; cluster of flowers attached to a leaflike bract.
TILIACEAE (p. 202.) Fruit fleshy; flowers not attached to a leaflike bract.
Fruit a pome, several-seeded MALACEAE (p. 177).
Fruit a drupe, 1-seeded AMYGDALACEAE (p. 179).
Stamens 10 or fewer.
Stamens 5, opposite the petals BHAMNACEAE (p. 201).
. Stamens not of the same number as the petals, or, if of the same number, alternate with them.
Calyx tube adherent to at least the lower part of the ovary.
Ovules 1 in each cell; leaves toothed; fruit a capsule. Flowers appealing in late autumn HamameUs (p. 172).
Ovules several in each cell; leaves lobed; fruit a berry.
GBOSSULABIACEAE (p. 172).
(P. 192),
(p. 201).
(p. 199).
(p. 198).
(p. 227).
(p. 200).
(p. 219).
(p. 227).
Calyx tube free from the ovary.
Fruit fleshy, a berry-like drupe.. AQUIFOIIACEAE (p. 199).
Fruit a capsule.
Capsule 2-celled; style about equaling the stamens.
ESCALLONIACEAE (p. 172).
Capsule 3 celled; style much longer than the stamens.
CLETHRACEAE (p. 220).
CC.fPlants herbaceous (slightly woody in Pyrolaceae).
Stamens more than 10.
Stems succulent, flat, the leaves reduced to scales; ovary inferior.
CACTACEAE (p. 211).
Stems not succulent and flat, the leaves developed; ovary superior (calyx slightly adherent in Castalia).
Plants aquatic, with broad floating or emersed blades.
NTMPHAEACEAE (p. 155).
Plants terrestrial.
Filaments united in a tube MALVACEAE (p. 202).
Filaments separate.
Leaves peltate, lobed Fodophyllum (p. 160).
Leaves not peltate.
Leaves compound BANTTNCTJLACEAE (p. 156).
Leaves simple.
Leaves tubular (hollow and pitcher-shaped).
SABBACEN1ACEAE (p. 170).
Leaves not hollow.
Leaves fleshy PORTULACACEAE (p. 150).
Leaves not fleshy.
Calyx tubular, 6-toothed; plants viscid. Parsonsia (p. 212).
Calyx of distinct sepals; plants not viscid.
Sepals 2; juice colored PAPAVERACEAE (p. 162).
Sepals 3-5; juice not colored. CISTACEAE (p. 205).
Stamens 10 or fewer.
#■ *■ *
Stamens as many as petals and opposite them.BERBERIDACEAE (p. 160).
Stamens not of same number as petals and opposite them.
Ovary inferior (partly inferior in Portulaca and Saxifragaceae).
Ovules and seeds more than 1 in each cell.
Ovary 1-celled.
Sepals or calyx lobes 2; plants succulent.
POBTULACACEAE (p. 150).
Sepals or calyx lobes 4 or 5; plants not succulent.
SAXEFRAGACEAE (p. 171).
Ovary 2—4-celled.
Anthers opening by terminal pores; leaves 3-ribbed.
MSIiASTOHATACEAE (p. 212).
Anthers not opening by pores; leaves not 3-ribbed.
Ovary slightly inferior; styles 2 Saxifraga (p. 172).
Ovary wholly inferior; style 1, the stigma often lobed.
ONAGBACEAE (p. 212).
. Ovules and seeds single in each cell.
Flowers in simple or compound umbels; stamens 5.
Fruit dry, splitting into seedlike carpels APIACEAE (p. 215).
Fruit fleshy, a 2-5-seeded drupe ABAX1ACEAE (p. 215).
Flowers in spikes.
Plants aquatic, with dissected leaves Myriophyllum (p. 214).
Plants terrestrial, the leaves not dissected Gaura (p. 213).
FLORA OF THB DISTRICT OF COLUMBIA, 49
Ovary superior.
Ovary simple.
Flowers papilionaceous ... -FAB ACE AX (p. 181), Flowers not papilionaceous CAESALFINIACEAE (p. 180).
Ovary compound (the cells, placentae, styles, or stigmas more than 1).
D, DD.