ARISTOLOCIIIACKA',. ( I'.IIM 11 WultT lAMILV.) 445 



§ 1. Cali/x-tiibe u-hol/i/ adnnte to the orari/, tfip dps inJJered in hud ; jilaments 

 slender, much longer than the short anthers; stifle barehf ^-Infted at the sum- 

 mit, with 6 radiating thick stigmas ; leaves a single jxiir, xmspittted. 



1. A. Canad^nse, L. Soft-puhesccnt ; leaves mciiiljraiiaeeous, kidney- 

 shaped, mure or less pointed (4-5' w ide wlien full grown) ; calyx hell-shaped, 

 the upper part of the short-pointed lohes \vi(kdy and ahniptly spn-adinj;, 

 brown-purple inside. — Hillsides in rich woods ; common, especially northward. 

 § 2. Calyx-tube inflated hell-shaped, someirhat contracted at the throat, its hisr 



adnate to the lower half of the ovarii ; limb 3-cleft, short ; anthers sessile or 

 nearly so, oblong-linear ; styles 6, fleshy, diverging, 2-cleft, bearing a thick 

 extrorse stigma below the clejl; leaves thickish, persistent, usually only one 

 each year, often ichitish-mottled ; peduncle very short; roolstocks clustered, 

 ascending. 



2. A. Virginicum, L. Nearly glabrous ; leaves round-heart-shaped 

 (about 2' witle) ; calyx short, reticulated within; anthers pointless. — Va. to 

 Ga., in and near the mountains. 



3. A. arifblium, Michx. Leaves halberd-heart-shaped {2 -4' long); calyx 

 oblong-tubular, with very short and blunt lobes ; anthers obtusely short-pointed. 

 — Va. to Fla. 



2. ARISTOLOCHIA, Tourn. Biuthwout. 

 Calyx tubular ; the tube variously inflated above the ovary, mostly contracteil 

 at the throat. Stamens 6, the sessile anthers wholly adnate to the short and 

 fleshy 3 - 6-lobed or angled style. Capsule naked, septicidally 6-valved. Seeds 

 very flat. — Twining, climbing, or sometimes upright perennial iierbs or slirubs, 

 with alternate leaves and lateral or axillary greenish or luri<l-purple flowers. 

 (Named from reputed medicinal properties.) 



§ 1. Calyx-tube bent like the letter S, enlarged at the two ends, the small limb ob- 

 tusely 3-lobed ; anthers contiguous in pairs {)iiaking 4 cells in a row under 

 each of the three truncate lobes of the stigma) ; low herbs. 



1. A. Serpentina, L. (Virginia Snakeuoot.) Stems (8- 15' high) 

 branched at base, pubescent ; leaves ovate or oblong (or narrower) from a heart- 

 shaped base or halberd-form, mostly acute or pointed ; flowers all next the 

 root, short-pedundod. — Rich woods. Conn, to Fla., west to Mich., Mo., and 

 La. July. — The fibrous, aromatic-stimulant root is well known in medicine. 

 § 2. Calyx-tube strongly curved like a Dutch pipe, contracted at the mouth, the 



short limb obscurely 3-lobed ; anthers contiguous in pairs under each of the 3 

 short and thick lobes of the stigma ; very tall twining shrubs ; flowers from 

 one or two of the superposed accessory axillary buds. 



2. A. SiphO, L'ller. (PirK-VixK. DtTCHMAx's Pipk.) A'^early gla- 

 brous ; Unrrs runnd-kldnc y-shaprd (sometimes 8-12' broad) ; peduncles with a 

 clasping bract ; calyx (H' long) with a brown-purj)le abrupt flat Uirder. — Kich 

 woods, Penn. to Ga., west to Minn, and Kan. May. 



3. A. tomentbsa, Sims. Downy or soft-hairy ; leaves round -hi'art-shn fyed , 

 very veiny (.'3 - 5' long) ; calyx yellowish, with an oltlique dark purple closed ori- 

 fice and a rugose reflexed limb. — Hich woods, mountains of N. C. to Kla., west 

 to S. 111. and Mo. June. 



