198 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



3. Zygadenus venenosus S. Wats. Proo. Am. Acad. 14: 279. 1879. Deatii camas. 



Type locality: Salinas Valley, "among hills," Monterey County, California, according 

 to the label on the type specimen. Collected by Brewer. 



Range: British Columbia to California. 



Specimens examined: Clallam County, Elmer 2493; Humptulips, iomft 1185; Whidby 

 Island, Gardner 294; Lope7< Island, Lyall in 1858; Tacoma, Flett 893; Admiralty Head, 

 Pijier, May, 1898; Fort Vancouver, Toltnie; Snoqualmie, Smith 1060; Steilacoom, Piper 

 211; Mucklcshoot Prairie, Ruhn; Spokane Valley, Lyall in 1861; Falcon Valley, SuJcxihrf 

 515; KHckitat River, Flett 1120; Pullman, Piper 1672, Elmer 831; without locality, 

 Vaseij in 1889. 



Z<^NAL ni.sTRiBLTioN: Transition. 



This species as liere accepted is quite variable, but none of the form.s .seems susceptible 

 of .seojrepation. The western Washington forms are more nearly typical, having the glands 

 of tiic perianth very distinctly limited. The poi-sonous qualities of the bulb of this plant 

 arc certainly much exaggerated, if indeed there is any real basis in fact for its reputed 

 virulence. 



The Washington specimens referred by Hooker a to LeimarUhium nuttaUii and by 

 CiMijxT b to Antiel^'a nitttaUii and A. doxiglasii are with little doubt Zygadenu^ venenosus. 



CONVALLARIACEAE. Lily ov the valley Family. 



Ijcaves reduced to scales; branches thread-like, green Asparagus (p. 202). 



Leaves foliaceous; branches not thread-like. 

 Plant prcMlucing but one flower. 



Liiavcs three in a whorl. Trillium (p. 1 9S). 



Leaves all basal, not whorled Clintonia (p. 199). 



Plant producing several to many flowers. 

 Inflorescence a raceme or panicle. 



Perianth segments six Vagnera (p. 199) . 



Perianth segments four Unifolium (p. 200). 



Inflorescence an umlwl or flowers solitary. 



Flowers terminal on the branches,. solitary or umbelled. Disporum (p. 201). 

 Flowers axillary, usually .solitary. 



Perianth narrowly campanulate Streptopus (p. 201). 



Perianth rotate. Kruiisea (p. 202). 



TRILLIUM. 



Flowers white, becoming purpli-sh, peduncled. 



Leaves rhombic-ovate; rhizome horizontal; petals much longer 



than the .sepals 1 . T. omtum. 



Leaves ovate; rhizome vertical; petals scarcely longer than the 



.sepals 2. 7'. crassifolium. 



Flowers sessile. 



Leaves sessile, mottled; petals whitish S. T. chloropetnhim. 



Ijeaves petioled, not mottled; petals brown-purple 4. T. petiolntum . 



1. Trillium ovatum Pui-sh, Fl. 1: 245. 1814. Wake-rokin. 



Trillium ohovatum Hook. Fl. Bor. Am. 2: 180. 1839. 



Type ixjcality: "On the rapids of the Columbia River." Collected by Lewis, April 10, 

 1806, on which date he was at the foot of the Cascades of the Columbia. 



Range: British Columbia to California and Idaho. 



a Flora Bor. Am. 2: 177. b Pac. R. Rep. 122: 09. 



