LILIACE.E 



111 





CONSPECTUS OF THE ABORESCENT SPECIES OF THE UNITED STATES. 



Flower-clusters usually sessile, or short-stalked. 



Fruit pendulous, with thick succulent flesh; seeds thick; albumen ruminate. 

 Segments of the perianth slightly united at the base. 

 Panicle glabrous or puberulous. 



Ovary stipitate; leaves sharply toothed on their horny margins, smooth, dark 

 green, slightly concave. 1. Y. aloifolia (C). 



Ovary sessile. 



Leaves concave, blue-green, rough on the lower surface. 2. Y. Treculeana (E) . 

 Leaves concave above the middle, light yellow-green, smooth. 



Style elongated. 3. Y. macrocarpa (E, H). 



Style short. 4. Y. mohavensis (G, H). 



Panicle coated with hoary tomentum; leaves concave, smooth, light yellow-green. 



5. Y. Schottii (H). 



Segments of the perianth united below into a narrow tube; leaves flat, smooth, dark 

 green. 6. Y. Faxoniana (E). 



Fruit erect or spreading, the flesh becoming thin and dry at maturity; seeds thin; albu- 

 men entire. 



Leaves rigid, concave above the middle, blue-green, sharply serrate. 



7. Y. brevifolia (F, G). 



Leaves thin, flat or concave toward the apex, nearly entire, rough on the lower 



surface, dull or glaucous green. 8. Y. gloriosa (C). 



Flower-clusters long-stalked; fruit capsular, erect, finally splitting between the carpels 



and through their backs at the apex; seeds thin; albumen entire; leaves thin, flat, 



filamentose on the margins, smooth, pale yellow-green. 9. Y. elata (E, H). 



i. Yucca aloifolia L. Spanish Bayonet. 



Leaves 18'-32' long, lj'-2^' wide, erect, rigid, conspicuously narrowed above the light 

 green base, widest above the middle, slightly concave on the upper surface, smooth, dark 



Fig. 106 



rich green, with a stiff dark red-brown tip, and horny finely and irregularly serrate mar- 

 gins; long-persistent. Flowers from June until August on stout pedicels, in nearly sessile 

 glabrous or slightly pubescent panicles 18'-24' long; perianth l'-l' in length and 3' or 4' 

 across when fully expanded, the segments ovate, thick and tumid toward the base, those 

 of the outer rank rounded and often marked with purple at apex, the inner acuminate 



