ARISTOLOCHIACEZ. (BIRTHWORT FAMILY.) 371 
Division I. APETALOUS EXOGENOUS PLANTS. 
Floral envelopes single, consisting of a calyx only, or alto- 
gether wanting. 
Orper 100. ARISTOLOCHIACE/E. (Birruwort 
! . FAMILY.) 
Herbs or woody vines, with alternate petioled mostly cordate and entire 
leaves, and solitary peduncled dull-colored flowers. — Calyx adherent to 
the 6-celled ovary, tubular, valvate in the bud. „Stamens 6 - 12, more or 
less united with the styles: anthers adnate, extrorse. Fruit 6-celled, few 
-many-seeded. Seed anatropous Embryo minute, at the base of fleshy 
albumen. ; 
1. ASARUM, Tourn. ASARABACCA. 
Calyx regular, 3-lobed. Stamens 12, the filaments partly united. with the 
style, and usually prolonged beyond the anthers. Capsule fieshy, globose, open- 
ing irregularly — Aromatic perennial herbs, with creeping stems, long-petioled 
cordate or kidney-shaped leaves, and axillary peduncled flowers. = = 
$1. Asarum. — Calyz bell-shaped, adnate to the ovary, 3-parted : filaments free 
nearly so: stigma 6-lobed. — Leaves deciduous. 
1. A. Canadense, L. (WILD GINGER-ROOT.) Pubescent ; leaves 2, kid- 
ney-shaped ; calyx-lobes acuminate; filaments as long as the style. — Mountains 
of North Carolina, and northward. April and May. — Flowers short-peduncled, 
purple within. 
$2. Hererorrora. —Calyx inflated, nearly free from the ovary, 3-cleft: fila- 
ments united with the ovary: styles 6 : stigmas 2-cleft. — Leaves evergreen, smooth, 
mottled. 
2. A. Virginicum, L. Leaves round-cordate ; calyx inflated-bell-shaped, 
With rounded lobes; stigmas deeply 2-cleft.— Rich shady woods in the upper 
districts, Georgia, and northward. April and May.— Leaves single or 2-3 
together, 2' long. Flowers 8" — 9/ long, nearly sessile at the base of the petioles, 
greenish without, dull purple within. ws 
3. A. arifolium, Michx. Leaves oblong-cordate; calyx pitcher-shaped, 
With rounded lobes; stigmas slightly 2-cleft.— Shady woods in the lower dis- 
tricts, Florida to North Carolina. March and April — Leaves 3'—4' long, - 
auriculate at the base, long-petioled. Calyx 1’ long, distinctly peduncled, con- 
tracted above the middle, dark purple within. vk ue 
Ee 2. ARISTOLOCHIA, Toum. Brrraworr, 
Calyx tabular, commonly bent and inflated bove the ovary. Anthers 6, we 
tile, adnate to the 3- 6-lobed or angled stigma. a. Capsule 6-valved. = Erect or — 
