Asarum 



Aristoloch iaceae 



403 



50 



Map 822 



Asarum canadense L. 



50 



Map 823 



Arl stolochi a Serpentaria L. 



50 



Map 824 



Aristolochia tomentosa Si 



of those in the Gray Herbarium from west of the Allegheny Mountains be- 

 long to this species. It is doubtfully separated from Comandra umbellata 

 and in Britton and Brown, Illus. Flora, ed. 2, it was regarded as a 

 synonym. Fernald gives the range of Comandra umbellata as restricted 

 to the area east of the Allegheny Mountains. Whether this species is main- 

 tained as distinct or is regarded merely as a geographical form, our speci- 

 mens belong to the segregate of plants with the lower surface of the 

 leaves not paler beneath and with a superficial rootstock. 



Eastern Que. to Assina., southw. to N. Y., Ind., Mo., and Kans. 



2112A. GEOCAULON Fern. 

 See excluded species no. 189, p. 1041. 



74. ARISTOLOCHIACEAE Blume Birthwort Family 



Acaulescent herbs; stamens 12, with more or less distinct filaments; capsule fleshy 



2170. Asarum, p. 403. 



Caulescent herbs or woody vines; stamens 6, the sessile anthers adnate to the stigma; 

 capsule dry 2174. Aristolochia, p. 404. 



2170. ASARUM [Tourn.] L. 



Calyx lobes usually reflexed in anthesis, triangular, acute or short-acuminate, generally 

 about as long or less than twice as long as the tube; internodes of the rhizomes, 

 except the last one, generally glabrous 1. A. reflexum. 



Calyx lobes erect or spreading in anthesis, lanceolate, long-acuminate to caudate, much 

 longer than the tube; internodes of the rhizomes mostly more or less pubescent. . . 

 2. A. canadense. 



1. Asarum reflexum Bickn. (Asarum canadense var. reflexum (Bickn.) 

 Rob.) Curly Wildginger. Map 821. Infrequent to frequent in moist, rich 

 soils in woods throughout the state. It spreads mostly by underground 

 stems, hence it is always found in dense colonies, usually in the lee of an 

 old log or treetop where there is an abundance of leaf mold or in some 

 sheltered situation on a wooded slope or in a ravine. 



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



