THE YUCCEAE. 45 
Leaves linear or linear-spatulate, white-margined. 
Leaves grass-like. — Eastern Texas. Y. tenuistyla. 
Leaves more rigid and spreading. — Western. 
Low. Seeds small. Y. constricta. 
Arborescent. Seeds very large. Y. radiosa. 
Inflorescence racemose or branched close to the leaves. 
Not arborescent. 
Leaves as in the last. Y. angustissima. 
Leaves lanceolate, often short. Y. Harrimaniae. 
Style swollen, green. 
Inflorescence racemose or branched close to the leaves. 
Leaves linear, rather stiff. Seeds large. Y. glauca. 
Leaves grass-like, flexible. Y. Arkansana. 
Inflorescence panicled on a long scape. Leaves as in the 
last or wider. Y. Louisianensis. 
Leaves with a distinct thin yellow or brown horny finely denticulate 
border. 
Capsule mucronate, with flat-backed valves. 
Arborescent. Leaves linear to lanceolate. Y. rigida. 
Acaulescent. Leaves lanceolate. Y. rupicola. 
Capsule attenuate-beaked, with round-backed valves. 
Arborescent. Leaves linear. Y. rostrata. 
Fruit (so far as known) indehiscent. 
Fruit erect or pendent, soon drying. Seeds thin, flat, slightly mar- 
gined: albumen not ruminated. § HETEROYUCCA. 
Leaves finely denticulate, softly green-pointed. Y. gigantea. 
Leaves at most sparingly denticulate or filiferous, pungent. 
Leaves broad, rigidly ascending or spreading. Fruit mostly 
pendent. Y. gloriosa. 
Leaves more elongated, recurved. Fruit erect so far as 
known. ; 
Inflorescence close to the leaves, the latter relatively 
broad. Y. recurvifolia. 
Panicle long-stalked. Leaves narrower. Y. jlexilis. 
Leaves crowded, regularly arcuate. Y. De Smetiana. 
Fruit pendent, fleshy and edible. Seeds thick, often convex, nearly 
or quite marginless: albumen ruminated. § Sarcoyucca. 
Fruit coreless, with purple pulp. Ovary stalked. Leaves with 
sharply denticulate horny border. Y. aloifolia. 
Fruit with a papery core and greenish or yellowish-white pulp. 
Ovary sessile. 
Leaves very minutely denticulate, not filiferous, flat or 
plicate. Y. elephantipes. 
Leaves soon more or less filiferous, concave. 
Margin at first slightly denticulate. Leaves thick and 
firm, scabrid Y. Treculeana. 
Not denticulate. 
