302 AKisTOLOcniACE.f:. (biktiiwokt family.) 



opening irregularly. — Aroinatio juTciinial IktIps, with ireeping stems, long- 

 jK'littK'tl coriiiitc or kidney-shain'il leaves, and axillary pedumled flowers. 

 § I. AsAiir.M. — Cttli/r htll-shuped, udnult to thf tnuirij, ^ijnuted : Jilamenls 

 j'nr or )i((irli/ so: stii/ma G-lobed. — Leaves deciduous. 



1. A. Canadense, L- (Wild Gingek-uoot.) Pubescent; leaves 2, 

 kidne\-slia])eil ; lalyx loi)es acuminate ; filaments as long as the style. — 

 Mountains of North Carolina; and northward. April - May. — Flowers short- 

 peduuded, purple within. 



§ 2. HKTKKOTKorA. — Cdlifx inflated, nearl ij free from the ocanj, 3-clefl : flia- 

 ments united with the ovary: styles 6: stigma 2-cteft. — Leaves evergreen, 

 smooth, mottled. 



2. A. Virginicum, l- Leaves round-cordate; calyx inflated-bell- 

 shajied, with rounded lobes ; stigiua.s deeply 2-cleft. — Kich shady woods in 

 the upper districts. April -May. — Leaves single or 2-3 together, 2' long. 

 Calyx 8" - 9" long, nearly sessile at the base of the petioles, greenish with- 

 out, dull purple within. 



3. A. arifolium, .Michx. Leaves oblong-cordate or hastate ; calyx pitcher- 

 shajied, with rounded lobes ; stigmas .sliglitly 2-cleft. — Shady woods. March - 

 April. — Leaves 3'-4' long, auriculate at the ba.se, loug-petiolcd. Calyx 1' 

 long, distinctly peduucled, contracted above the middle, dark purple within. 



2. ARISTOLOCHIA, Tourn. Bikthwout. 

 Calyx tubular, commonly bent and inflated above the ovary. Anthers 5-6, 

 sessile, adnate to the 3 - 6-lobed or angled stigma. Capsule 5 - 6-valved. — 

 Erect or twining herbs or shrubs. Leaves akeruate, cordate at the base. 

 Flowers long-peduncled, axillary, or near the base of the stem. 



* Stamens 6. 

 •t- Low herbs. 



1. A. Serpentaria, L. (Snakekoot.) Stems single or clustered, pu- 

 bescent, zigzag and leafy above ; leaves short-petioled, varying from ovate to 

 linear-lanceolate, cordate or hastate at the base ; flowers near the base of the 

 stem, on bracted spreading peduncles; cah'x tortuous, 3-lobed, dull purple. — 

 Shady woods. June -August. — Stem 8'- 12' high. Leaves 2' -4' long. 

 Caly.x shaped like the letter S. 



■*- ■*- Woody vines: capsule oblong, 6-angled, 3' -4' long. 



2. A. Sipho, L'ller. Stem smoothish ; leaves large, orbicular-cordate, 

 .slightly pubescent beneath; peduncles slender, solitary, with a roundish clasp- 

 ing bract near the base ; calyx curving upward, with the broad spreading 

 brownish pnrjile border obscurely 3-lobed. — Rich woods along the mountains. 

 May. — Stem climbing high. Leaves 6' - 12' broad. Calyx shaped like a Dutch 

 pipe, H' long. 



3. A. tomentosa, Sims. Hoary-pubescent ; leaves cordate ; peduncles 

 opposite the leaves, Ijractless, woolly ; calyx bent in the middle, the greenish 

 rugo.se unequally 3-lobed border reflexed, thickened and dark brown at the 

 nearly closed throat. — River banks, chiefly in the upper districts. May. — 

 Stem very long. Leaves 3' -5' long. Calyx similar in shape to the preced- 

 ing, but smaller. 



