200 ARISTOLOCHIACEAE 
Flowers smaller than the typical form and lobes of the calyx early re- 
flexed. Conn., and southward. April-May. 
2, ARISTOLOCHIA, L. 
Erect herb or twining vines with alternate leaves on leaf-stalks, egg- 
shaped, base heart-shaped, apex tapering. Flowers irregular. Stamens 
6, style 3 to 6 parted. 
1. A. Serpentaria, L. (Fig. 2, pl. 30.) Vircinta Snake Root. 
Leaves egg-shaped or broad lanceolate with heart-shaped base, 13 to 5 
in. long, alternate. Flowers from a pedicel arising from the root and 
which bears scaly bracts. The calyx tube elongated and curved like an 
S, the mouth broadly open. Rare in our region. June-July. 
2. A. Clematitis, L. Brrrawort. European species, escaped from 
cultivation, naturalized near Flushing, Troy, and Utica, N. Y., with 
straight calyx tube and clustered flowers. 
3. A. macrophylla, Lam. DutcuMman’s Pipe. A twining vine mostly 
cultivated. Leaves broad, kidney-shaped, densely downy. Flower in the 
form of a pipe. Rich woods, southern Penna. 
Order III.—POLYGONALES. Order of the Sorrelworts 
Flowers without corollas, the perianth consisting of a regular 
enyelope which is not adherent to the ovary. Stamens generally 
equal in number to the divisions of the green or colored calyx, 
rarely double the number or less or more. Ovary one, surmounted 
by a pistil which divides into 2 or 3 stigmas. Fruit a dry 3-angled 
seed or a compressed one with wings. Stamens and pistils in the 
same flowers or in different flowers. Only one family. 
Famity. POLYGONACEAE. Buckwuerat FaMILy 
Herbaceous plants erect or twining, with alternate leaves. Calyx 
green, colored or white, divided in 3 to 6 parts; seed carpels 2 or 
3. In our species the joints at the leaf-stalks are always sur- 
rounded by a long sheathing collaret extending on the stem above 
the insertion of the leaf stalk. There is no true stipule. These 
collarets are known as ocreae. Flowers in elongated terminal clus- 
ters or more compressed clusters in the leaf axils. 
Calyx in 4 parts, stamens 6 . . 4. 5's. a « « 
Calyx in 6 parts . i de eS pe Pees} vn? cs 
Calyx in 4 or 5 parts; stamens 5 to 9. 
Pedicels of flowers solitary and closely jointed § Polygonella 
Pedicels several in a group. 
Fruit ordinarily enveloped by the perianth Polygonum 
Fruit larger than the perianth . . . Fagopyrum 
