The Flora of the Cayuga Lake Basin 185 



38. ARISTOLOCHIACEAE (Birthwort Family) 



a. Plant acaulescent; perianth regular, persistent; stamens 12; anthers free from the 

 stigma. 1. Asarum 



a. Plant caulescent, erect or twining ; perianth irregular, tubular, deciduous ; stamens 

 6; anthers adnate to the style or stigma. 2. Aristolochia 



1. Asarum (Tourn.) L. 



a. Lobes of the calyx short-acuminate, mostly spreading. 1. A. canadense 

 a. Lobes of the calyx long-caudate-acuminate, mostly spreading. 



la. A. c, var. acuminatum 

 a. Lobes of the calyx triangular, scarcely acuminate, short, strongly reflexed. 



lb. A. c, var. reflexum 



1. A. canadense L. (A. canadense, in part, of Cayuga Fl.) Wild Ginger. Canada 

 Snakeroot. 



Rich moist humus in upland woods, mostly overlaying calcareous gravels .and rich 

 loams ; scarce. Apr.-May. 



N. of Lick Brook ; Taughannock Gorge ; and probably elsewhere. 



N. B. to Man., southw. to N. C, Mo., and Kans. ; occurring only occasionally on 

 the Coastal Plain. 



la. A. canadense L., var. acuminatum Ashe. (A. canadense, in part, of Cayuga 

 Fl.) 



In situations similar to the preceding ; apparently much more common. 



Enfield Glen; n. of Lick Brook; Six Mile Creek; Fall Creek; Taughannock 

 Gorge ; ravine near Elm Beach, Romulus ; s. of Willets ; Merrifield ; and elsewhere. 



Conn, and N. Y. to Minn, and Ky. ; common westw. 



In this flora this variety is scarcely more than an extreme of the typical form. 



lb. A. canadense L., var. reflexum (Bickn.) Robins. 



Alluvial woodlands ; rare. 



Howland Island, 1919 (A. H. Wright') ; alluvial wooded bank of Clyde River, 

 Galen, 1923 (L. F. Randolph, A. J. £., & K. M. IV.). 



Conn, and s. N. Y. to Mich, and Iowa, southw. to Mo. and Kans. 



2. Aristolochia (Tourn.) L. 

 1. A. Clematitis L. Birthwort. 



Damp thickets on rich gravelly banks ; rare. June. 



Union Springs, on a bank s. e. of the railway station (D. !), probably escaped from 

 cultivation. "First seen in 1874" (D.), it has since spread over a large area. 



N. Y. to Md. Native of s. Eu. 



39. POLYGONACEAE (Buckwheat Family) 



a. Sepals 6, the three inner ones much enlarged in fruit (except in Rumex Accto- 

 sella) ; flowers greenish yellow, frequently tinged with red, wind-pollinated; 

 stigmas tufted. 1. Rumex 



a. Sepals 4-5, nearly equal ; flowers purple, pink, white, or greenish white, not wind- 

 pollinated; stigmas not tufted. 

 b. Leaves triangular-hastate; plant erect; embryo in center of endosperm; achene 

 3-angled; flowers white. [Fagopyrum] 



/». Leaves not triangular-hastate, or, if so, the stem climbing by prickles or twin- 

 ing; embryo curved around one side of endosperm; achene lenticular or 

 3-angled ; flowers of various colors. 2. Polygonum 



