LILIACE^E. (LILY FAMILY.) 353 



1. S. amplexifolius, DC. Stem 2 to 3 feet high: leaves very smooth, 

 glaucous underneath : anthers tapering to a slender point : stigma entire, 

 truncate. — Across the continent in northern latitudes and ranging south to 

 New Mexico. 



16. PROS ARTE S, D.Don. 



Low and pubescent, divergently branched above, with closely sessile ovate 

 and membranaceous leaves, and drooping flowers. In ours the stigma is 

 3-cleft. 



1. P. trachycarpa, Watson. Leaves ovate to oblong-lanceolate, acute 

 or rarely acuminate : perianth-segments whitish, slightly spreading, acute : 

 fruit broadly obovate, obtuse and rather deeply lobed, papillose. — Eot. King 

 Exped. v. 344. Colorado to Utah and the Saskatchewan. 



17. VERATRUM, Tourn. False Hellebore. 



The pubescent panicle mostly staminate below, with green or greenish 

 bracts. In ours the leaves are broad-elliptical and sheathing, the ovary gla- 

 brous, and the capsule many-seeded. 



1. V. Californicum, Durand. Stem 2 to 7 feet high: upper leaves 

 lanceolate, but rarely acuminate : branches of the sometimes compound 

 panicle ascending : perianth-segments obtuse, whitish with greener base, 

 often denticulate above. — V. album, Watson. From Colorado and Wyoming 

 to N. California and Oregon. 



18. ZYGADENUS, Michx. 



Stem from a coated bulb crowning a short rhizome, with narrowly linear 

 obscurely nerved leaves mostly near the base : otherwise as Veratrum. In 

 ours the gland covers more or less of the base of the perianth-segments. 

 * Flowers rather large, mostly perfect. 



1. Z. elegans, Pursh. Stem ^ to 3 feet high: leaves glaucous, 2 to 6 

 lines broad : raceme often few-flowered : bracts ovate-lanceolate, usually pur- 

 plish : perianth adnate at base; segments broad, greenish, the inner abruptly 

 contracted to a broad claw ; gland obcordate. — Z. glaucus, Nutt. From New 

 Mexico to Oregon and Canada. 



2. Z. Nuttallii, Gray. Stem stout, 2 feet high: leaves 3 to 8 lines 

 broad : raceme rather densely flowered, with narrow membranous bracts: perianth 

 free from the ovary ; segments not clawed, with an ill-defined gland at base. — 

 Manual, 525. From Colorado to Texas. 



* * Flowers smaller, polygamous. 



3. Z. venenosus, Watson. Stein slender, | to 2 feet high : leaves 2 ot 

 3 lines broad, scabrous, the cauline not sheathing : raceme simple, short : 

 perianth-segments triangular-ovate to elliptical, obtuse or rarely acutish, all ab- 

 ruptly contracted to a short glandular claw ; gland extending slightly above 

 the claw with a well-defined irregular margin: seeds 1£ to 2^ lines long. — 

 Proc. Am. Acad. xiv. 279. From the Wasatch to California and British 

 Columbia. Known as "Death-Camass " or " Hogs' Potato." 



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