KEY TO THE SPECIES 9 



1. Zyg:adenus elegans Pursh {Larob-flowered Camass). Stem i-8 dm. 

 high; leaves glaucous, keeled, 1-2 cm. broad; flowers greenish- white, the segments 

 obovate, 7-10 mm. long, with an obcordate glaud near the base ; capsule oblong, 

 longer than the flower segments. In wet valleys. 



2. Zygadenus falcatus Eydb. Stem stoutish, 3-4 dm. high ; leaves some- 

 what scabrous, shorter than tfie stem, usually conduplicate and falcate ; flowers 

 yellowish-white, the segments 5 mm. long, ovate, short-clawed ; gland semi- 

 orbicular ; capsule ovoid-cylindrical. 



VII. LILIACEiE (Lilt Family) 



Herbs ; stems scapose or leafy, from bulbs or fleshy roots (a 

 ■ woody caudex in Yucca) ; leaves mostly linear ; flowers per- 

 fect ; perianth of 6 distinct segments ; stamens 6, on the recep- 

 tacle or the tube of the perianth ; styles united ; stigma 3-lobed 

 or entire ; ovary 3-celled, becoming a capsule. (See Plant 

 Structures, p. 245.) 



* With fleshy roots from a short rootstock. 



1. Lieucocrinuiu, Perianth white, with long narrow tube. 



* * Bulbous plants. 



-t- Flowers in umbels. • 



2. Allium. Umbel of flowers from a, 1- or 2-leaved scarious sheath ; onion 

 scented. 



-(- -*- Flowers solitary, racemed or sub-umbellate. 



** Perianth segments all alike. 



3. Iiilinm. Perianth large, erect, funnel-form, orange-red. 



4. Fritillaria^ Perianth nodding, small, reddish-brown, segments not 

 reflexed. 



5. Erythronium. Perianth nodding, yellow, segments reflexed. 



++ ++ Outer perianth segments narrower than the inner. 



6. Calocliortus. Flowers erect, outer segments small, the inner with a hairy 

 gland at base. 



* * * With large woody caudex. 



7. Yucca. Leaves rigid, sharp-pointed, numerous. 



1. LEUCOCRINUM 



Stemless, the numerous fleshy roots from a short rootstock which bears the 

 several linear leaves ; flowers few to many from the crown of the rootstock. 



1. Leucocrlnum montanum Nutt. (White Mountain Lily). Leaves thick, 

 surrounded at base by scarious bracts ; flowers white, the tube slender, 3-5 cm. 

 long, the segments spreading ; stamens on the tube ; style long, with dilated 

 stigma. The fragrant blossoms appear just above the ground in early spring. 

 3 



