ASARACEAE 1133 
parietal placentae: styles united into a 4—6-angled column. Ovules numerous in each 
cavity. Capsule pendulous, 4-6-valved. Seeds numerous, horizontal, often „flattened. 
Testa hard, crustaceous. 
Erect herbs. 
Plants sparingly and indistinctly pubescent with soft hairs. 
Leaf-blades hastate, delicate: capsule 5-6 mm. long. 1. A. Nashii. 
Leaf-blades not hastate, membranous: capsule about 1 em. long. 2. A. Serpentaria. 
Plants manifestly pubescent with stiff spreading hairs. 
Leaf-blades petioled, firm, not prominently reticulated. 3. A. convolvulacea, 
Leaf-blades nearly sessile, clasping, leathery, prominently reticulated. 4. A. reticulata. 
Twining or prostrate vines, 
Plants herbaceous: limb of the calyx expanded only on one side: stamens 5. 5. A. pentandra. 
Plants woody : limb of the calyx spreading on all sides: stamens 6. 
Foliage densely tomentose: leaf-blades leathery: hypanthium tomentose. 6. A. tomentosa. 
Foliage minutely pubescent or glabrous: leaf-blades membranous : hypan- 
thium glabrous. 7. A. macrophylla. 
1. Aristolochia Náshíi Kearney. Foliage bright green, finely pubescent. Stems 
erect or reclining, 1-3 dm. long, flexuous, angled, simple or branched below: leaves deli- 
cate ; blades very thin, linear or lanceolate, hastate, or the young leaves sometimes ovate, 
2--10 em. long, acuminate, ciliate, short-petioled, cordate at the base: peduncles slender, 
1-flowered : bracts 2-4 mm. long: flowers brownish purple, 10-12 mm. long: calyx-limb 
slightly 3-lobed, about 1 cm. broad : hypanthium pilose: capsules subglobose, 5-6 mm. in 
diameter, pilose, sharply angled. 
In damp woods, Virginia to Florida and Louisiana. Summer. SNAKEROOT. 
2. Aristolochia Serpentaria L. Foliage deep green, sparingly pubescent. Stems 
erect, 2-5 dm. tall, simple or branched below, more or less zigzag, angled, leafy above, 
naked below: leaves few ; blades oblong-lanceolate to oval-lanceolate or rarely lanceolate, 
4-15 em. long, acuminate, undulate, cordate at the base, 3-nerved, short-petioled : pedun- 
cles 1-flowered, bracted, solitary or clustered: bracts 2-3 mm. long: flowers S-shaped, 
about 1 em. long: hypanthium inflated at the ovary and at the throat : calyx-limb slightly 
8-lobed : capsules subglobose, about 1 cm. in diameter. 
In woods, Connecticut to Michigan, Florida and Missouri. Summer to fall. SNAKEROOT. 
3. Aristolochia convolvulàcea Small. Foliage bristly-pubescent throughout. 
Stems erect or decumbent, 1-3 dm. long, angled, slightly zigzag, simple or rarely branched 
below: leaves few; blades thinnish, becoming firm at maturity, broadly ovate to oval, 
2-8 em. long, short-acuminate or rarely acute, ciliate, deeply cordate at the base ; petioles 
0.5-1.5 cm. long, hirsute: peduncles slender, 1-2-flowered, zigzag angled : hypanthium 
densely hirsute: flower 0.5-1 cm. long : calyx-limb 6-8 mm. broad, scarcely lobed : cap- 
sules subglobose, 6-7 mm. in diameter, pubescent. 
In woods, Georgia. Spring and summer. 
4. Aristolochia reticulata Nutt. Foliage bright green, pubescent. Stems erect or 
decumbent, 1-3 dm. tall, angled, simple or branched below, zigzag, hirsute: leaves few ; 
blades oblong, angled, oval or broadly ovate, firm, 3-10 cm. long, obtuse or acutish, un- 
dulate, prominently reticulated beneath, pubescent on both sides, nearly sessile, clasping : 
flowers corolloid, pubescent, dark brown, solitary or in bracted racemes: bracts ovate to 
to suborbicular. 
On river banks, Arkansas to Louisiana. Summer. 
5. Aristolochia pentandra Jacq. A diffusely twining vine, with minutely or spar- 
ingly pubescent foliage. Stems commonly several meters long ; leaf-blades narrowly or 
broadly ovate, 4-10 cm. long, sometimes slightly 3-lobed, cordate at the base; petioles 
shorter than the blades: pedicel slightly shorter than the peduncle : hypanthium minutely 
pubescent: calyx nearly straight, the small limb not lobed, expanding on one side, nearly 
erect: capsules globular, 1.5-2 cm. long. 
In thickets, southern peninsular Florida and the Keys. Also in the West Indes. 
6 Aristolochia tomentdsa Sims. A twining vine, with tomentose foliage. Stems 
often 10 m. long, woody : leaf-blades firm, broadly ovate to suborbicular, 10-18 cm. long, 
rounded at the apex, cordate at the base, finally reticulated ; petioles stout, densely tomen- 
tose; peduncle wanting: pedicel short, stout: hypanthium densely tomentose and yellow- 
ish green without : calyx abruptly bent above the ovary and contracted into a slender neck 
above the inflation, the limb expanded, 3-lobed, greenish purple, dark brown in the center, 
glabrous within : capsules cylindric-prismatic, 4-6 cm. long. : 
In woods, Missouri to the Indian Territory, North Carolina and Florida. Spring and summer. 
PIPEVINE. 
7. Aristolochia macrophylla Lam. A twining vine with a stem sometimes 10 m. 
long and minutely pubescent or almost glabrous foliage. Leaf-blades thin, reniform, sub- 
orbicular or broadly ovate, 5-25 em. in diameter, abruptly acute or obtuse, glabrous above, 
