lOS rONTRTBITTIOiSiS FROM THE NATTDNAL HERBARIUM. 



3. Zygadenus venenosus S. Wats. Prof,. Am. Acad. 14: 279. 1879. Death 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, Lamb 1185; Whidby 

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

 Piper, May, 1898; Fort Vancouver, Tolmie; Snoqualmie, Smith 1060; Steilacoom, Piper 

 211; Muckleshoot Prairie, RnJin: Spokane Valley, Lyall in 1861; Falcon Valley, Siilsdorf 

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

 IV'.sY'v i;i 1889. 



Zonal distribution: Transition. 



This spcci(\s as here accepted is quite variable, but none of the forms seems susceptible 

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

 of the perianth very distinctly limited. The poisonous qualities of the bulb of this plant 

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

 virulence. 



The Washington specimens referred l)y Hooker « to Leimanthium nuitallii and by 

 Cooper l> to Anticlea nnttaUii and A. doucjlasii are with little doubt Zi/gadenus venenosus. 



CONVALLARIACEAE. Lily of the valley Family. 



Leaves reduced to scales; branches thread-like, green AsPABACiUs (p. 202). 



Leaves foliaceous; branches not thread-like. 

 Plant producing but one flower. 



Leaves three in a whorl Trillium (p. 19Sy 



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



Plant producing several to many flowers. 

 Infloi'cscence a raceme or panicle. 



Perianth segments six Vagnera ( p. 199 ) . 



Perianth segments four Unifolium ( p. 200). 



Inflorescence an umbel or flowers solitary. 



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

 Flowers axillary, usually solitary. 



Perianth narrowly campanulato Streptopus (p. 201). 



Perianth rotate Kruiisea (p. 202). 



TRILLIUM. 



Flowers white, becoming purplish, peduncled. 



Leaves rhombic-ovate; rhizome horizontal; petals much longer 



than the sepals _ ] . T. ovatum. 



Leaves ovate; rhizome vertical; petals scarcely longer than the 



sepals 2. T. erassifnHuni. 



Flowers sessile. 



Leaves .sessile, mottled; petals whitish 3. T. eldoro petal urn. 



Leaves petioled, not mottled; petals brown-purple 4. T. petiolatinr,. 



1. Trillium ovatum Pursh, Fl. 1: 245. 1814. W\ke-rop,t;m. 



TrUliinii ohovatinti Hook. Fl. Bor. Am. 2: 180. 1839. 



Type locality: "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 (\iliiml)ia. 



Range: British Columbia to California and Idaho. 



a Flora Bor. Am. 2: 177. >> Pac. R. Rep. 12-: 69. 



