\ 
326 The Botanical Gazette. [October, 
~ 
course of ages have been gradually acclimated by artificial 
dissemination, and not the fragments of a flora derived from 
Arctic regions. Granting this, then the same method would 
apply to Clematis Virginiana, Negundo aceroides, Ampelopsis 
quinquefolia, Prunus (Cerasus) serotina, Cornus, Shepherdia 
argentea, Sambucus pubens, Hypopitys; all found according 
to Richardson far north in the British possessions, within the 
old buffalo range, but also common as far south as latitude 
35° north. 
Golden, Colorado. 
Notes on certain species of Erythronium. 
E. B. KNERR. 
Perhaps there. is no more interesting genus of plants among 
Liliacee than Erythronium. The species are the first of the 
order to appear in the spring and in point of beauty are 
second to none. Besides, there are features of propagation 
of which arise from underground corms. : 
forms these corms, or rather fleshy bulbs, consist of a series 
of corms arranged somewhat spirally one within the rete 
sometimes as many as four or five in number, the yee 
innermost, each corm producing its plant in succession 4 bee, 
apart and beginning with the oldest and outermost. ag 
times, however, in E. mesochoreum and E. Americanum t 
happens that two and even three of these corms may ieee 
once, producing as many leafy scapes apparently from As 
same root, when ordinarily but one would be expecte? 
yet I have never noticed this in E. albidum. 
. i ap 
The sterile forms (one-leaved) both of E. Amer 
E. albidum, and sometimes the flowering, send out xtrem 
ground off-shoots or rhizomes which produce at ee 
sa ) 
ities new corms destined to furnish the plants 
; *. this difference: 
season. In the two species, however, there 1s this diffe 
