^sarmn.l ARISTOLOCHIEiE, 139 



1. C. umbellata (Nutt. Gen, Am. 1, p. 157) ; caule ramoso, foliis lanceolatis subrigidis, 

 umbellulis in paniculas foliosas terminales dispositis, perianthii laciniis oblongis erectis. 



(Tab. CLXXIX. A.)— Rich, App,p. 8.— Thesium umbellatum.^^i PL Am. I. p. 177. 



— T. corymbulosum. Mx. 



Hab. From Lake Huron to the Saskatchawan, and to the Rocky Mountains. Dr Richardson, Drum- 

 inond, Douglas. Dr Todd. Dry banks of the Columbia River. Toimie. Gairdner. -^This species is correctly 

 described by Mr Nuttall, except that he considers the five lacini£B of the perianth as the five petals of a 

 corolla inserted upon the edge of a tubular calyx, which most assuredly is not the case. He well observes 

 the curious tuft of hairs by which each anther is attached at the back to the segment of the perianth. The 

 fruit seems to be chartaceous, enveloped by the thickened tube of the perianth, and thus somewhat drupaceous. 

 In this species it is only the lower part of the tube that is united with the ovary : and the persistent upper 

 free portion of this tube forms a sort of neck at the top of the fruit. 



Tab. CLXXIX. A.— Comandka umbellata. Fig. 1, Umbel of flowers; / 2, Flower laid open; 

 /. 3, Segment of the perianth, with the stamen, exhibiting the tuft of filaments at the back of the anther ; 

 / 4, Fruit (nat. size) ; f. 5, Fruit ;— magnified. 



2. C. livida (Rich. App. p. 9); caule simplici, foliis ellipticis flaccidis, umbella solitaria 

 axillari pedunculata trifloraj perianthii laciniis brevibus patentibus. (Tab. CLXXIX. B.) 



Hab. From Lake Winipeg to the Rocky Mountains, and to lat. C9° on the Mackenzie River. Dr Rich' 

 ardson. Drumynond. Newfoundland and Labrador. Miss Brenton. Dr Morison.—'T\m is a very distinct 

 species, and has been well described by Dr Richardson. Here the whole tube of the calyx is incorporated 

 with the germen ; the limb short and spreading. Filaments, also, and style very short. There is ripe fruit 

 upon the specimens, but pressed and injured. The singlo seed, however, appears to be attached near the 

 middle to a funiculus, which rises from the base of the cell. 



4 



Tab. CLXXIX. B.— Comandra livida. Fig. I, Umbel of flowers ; / 2, Single flower ; /. 3, Segment 

 of the perianth, with the stamen ; / 4, Fruit {nat. size) ; /. 5, Fruit ; and /. 6, Fruit cut through trans- 

 versely, containing the seed : — magnified. 



Ord. LXXXIIL ARISTOLOCHIE^. Juss. 



1. ASARUM. L. 



1. A, Canadense., L. 



Ph. Am. 2. p, 596. Hook. Bat. Mag. t. 2769 p. perianthii 



lobis longissimis subulato-acuminatissimis. 



Hab. Throughout Canada to the Saskatchawan. Dr Richardson. Drummond.-~{i. Abundant in shady 

 pine woods, among moss, on the N. W. Coast. Douglas.—Hhis species varies exceedingly in the length of 

 the acumination of the lobes of the perianth ; but none of the specimens from the east side of the Rocky 

 Mountains have them much more than half the length of those from the Pacific side of America : these lobes 

 appear also to be much more erect, the flowers larger, and the leaves more truly cordate and less downy. 

 Future observation may prove it to be a distinct species, as Mr Douglas considered it. 



