Flora of the Palousc Region 41 



Plants with bulbs or cortns. 

 Flowers in umbels. 



Perianth-lobes united, funnel-form: stamens on the throat. 



64. BK.ODIA.EA. 

 Perianth-lobes not united: stamens on the bases of the lobes. 



63. allium. 

 Flowers solitary or in racemes or cymes. 



Perianth-segments all alike or nearly so. 



Stem leafy: flowers leafy-bracted. 65. kritillaria. 



Leaves only two, opposite, appearing basal: flowers bractless. 



66. KRYTHRON'IUM. 

 Leaves linear, basal: flowers bracted. 



Flowers small, greenish-white. 61. zygadenus. 



Flowers large, blue. 68. camassia. 



Outer perianth-segments narrower than the inner. 



67. CALOCHORTUS. 

 Plants with rootstocks. 



Leaves all basal. 69. clixtoxia. 



Leaves alternate, cauline. 

 Flowers terminal. 



Flowers racemed or panicled. 



Flowers polygamous or monoecious, rather large. 



62. VERATRIM. 



Flowers perfect, small. 70. smilacixa. 



Flowers umbelled or solitary, terminal. 71. dlsporum. 



Flowers axillary. 72. strkptopus. 



Leaves in a whorl of three below the flower. 71. Trillium. 



61. ZYGADENUS. 



Glabrous erect perennial herbs from bulbs (in ours), and with 

 leafy stems: leaves narrowly linear: inflorescence a terminal panicle 

 or raceme: flowers perfect or polygamous, greenish, yellowish or 

 white: perianth-segments lanceolate or ovate, separate or united 

 below, sometimes adnate to the lower part of the ovary, with one 

 or two glands or a spot just above the narrowed base: stamens 

 free from the perianth-segments, about equalling them in length: 

 ovary 3-celled: ovules several or nnmerous in each cavity. 



Z. veneilOSUS Wats. Stems 30-50 em. tall, from ovate, dark-coated bulbs: 

 leaves several, linear, keeled, 3-5 mm. broad, shorter than the stems: raceme 

 many-flowered, 5-10 cm. long, much longer in fruit: flowers yellowish, on 

 pedicels 5-10 mm. long: bracts awl-shaped: perianth segments clawed, ellip- 

 tical, the blade obtuse; nectaries with thick margins. Common in meadows 

 and hillsides. Bulbs poisonous. 



62. YKRATRT'M. 



Tall perennial herbs, from short thick poisonous rootstocks: 

 stem pubescent: leaves mostly broad, clasping, strongly veined 

 and plaited; inflorescence pubescent, of terminal panicles: flowers 

 greenish, yellowish or purple, rather large, polygamous or mon- 

 oecious, on short stout pedicels: perianth-segments 6, glandless or 

 nearly so, adnate to the base of the ovary: stamens opposite the 



