58 



LILIACEAE. 



77. Calochortus, 60. 



Family 21. LILIACEAE. Lily Family. 



Terrestrial herbs or sometimes woody plants; stems usually 

 from bulbs, corms, or more or less thickened rootstocks; flowers 

 mostly perfect, regular; perianth not glumaceous, of 6 separate 

 or united segments free from the ovary; stamens 6, opposite 

 the perianth-segments; ovary 3-celled; fruit a few to many- 

 seeded 3-celled capsule or berry. 



Plants with bulbs or corms. 

 Flowers in umbels. 



Perianth-lobes united, funnel-form; stamens 



on the throat. 75. Hookera, 58. 



Perianth-lobes not at all or but slightly united ; 

 stamens on the bases of the lobes. 76. Allium, 59. 



Flowers solitary or in racemes or cymes. 



Outer perianth-segments narrower than the 



inner. 

 Perianth-segments all alike or nearly so. 

 Leaves on the stem. 



Leaves only two at the surface of the 

 ground but near the middle of the 

 stem, appearing basal; flowers bract- 

 less. 

 Stem leafy; flowers leafy-bracted. 

 Leaves linear, basal; flowers bracted. 

 Flowers small, greenish-white. 

 Flowers large, blue. 

 Plants with rootstocks. 

 Leaves all basal. 

 Leaves cauline. 



Leaves in a whorl of three below the flower. 

 Leaves alternate. 

 Flowers axillary. 

 Flowers terminal. 



Leaves linear, rigid. 

 Leaves broader, not rigid. 



Flowers umbelled or solitary, ter- 

 minal. 

 Flowers racemed or panicled. 



Flowers polygamous or monoe- 

 cious, rather large. 87. Veratrum, 64. 

 Flowers perfect, small. 88. Vagnera, 65. 



78. 

 79. 



80. 

 81. 



82. 



83. 



84. 



85. 



Erythronium, 61. 

 Fritillaria, 61. 



ZiGADENUS, 62. 



quamasia, 62. 

 Clintonia, 63. 

 Trillium, 63. 

 Streptopus, 63. 

 Xerophyllum, 64. 



86. Disporum, 64. 



75. HOOKERA. 



Usually erect scapose herbs from a membranous-coated corm ; 

 leaves linear; inflorescence a several-bracted umbel of few to 

 many flowers, on jointed pedicels; perianth funnel-form not 

 contracted at the throat, blue, purple, yellow or white, the seg- 

 ments united; stamens 3 on the throat opposite the inner lobes 

 and alternate with three sterile stamens, or 6 in one or two rows; 

 ovary stalked or sessile, 3-celled, each cavity containing 3-8 

 seeds. 



