46 MISSOURI BOTANICAL GARDEN. 
Thin, flexible: threads sparing, fine. Y. Schottii. 
Thick, rigid, with usually coarse threads. Leaves: 
narrow, smooth. Small tree. Y. brevifolia. 
Leaves relatively broader, usually smooth. 
Large trees. 
Panicle narrow, pendent. Y. australis. 
Panicle broad, erect, to recurved Y. valida. 
Leaves large, very coarsely filiferous, the back 
very scabrous except in the last. 
Acaulescent. Flowers very large for the 
genus: style elongated. Y. baccata. 
Arborescent. Flowers of average size. 
Style elongated. ¥. macrocarpa. 
Style short. ¥. Mohavensis. 
SYNOPSIS OF SPECIES. 
A. Fruit erect, capsular, dehiscent. Seeds thin, flat, margined: albu- 
men not ruminated. —§ Chaenoyucca. 
1. Leaves finely filiferous at the margin (entire in aberrant garden 
forms of the second). 
2. Style oblong, white, 
3. Inflorescence a long-peduncled panicle (reduced to a simple ra- 
ceme in aberrant forms or secondary inflorescences of the second). 
4. Leaves lanceolate or spatulate, often plicate, not conspicuously 
white-margined. 
Y. rmamentosa Linnaeus, Sp. Pl. 319. (1753).— 
Walter, Fl. Carol. 124.— Michaux, Fl. 1: 196.— 
Pursh, Fl. 1: 227. — Gawler, Bot. Mag. 23. pl- 
900.— Redouté, Liliacées. 5. pl. 277-8. — Haworth, 
Syn. Pl. Succ. 70.—Gambold, Amer. Journ. Sci. 
1819 : 251. — Mordaunt, Herb. Gén. 4. pl. 258. — 
Elliott, Bot. S. C. and Ga. 1: 400. — Frost, Plants 
Abbeville Distr. 317. — Lemaire, Ill. Hort. 18: 98. — 
Porcher, Resources So. Fields and For. 530. — 
Curtis, Bot. N. C. 56.— Engelmann, Trans. Acad. 
St. Louis. 3: 52, 214. — Baker, Gard. Chron. 1870: 
923. Journ. Linn. Soc. Bot. 18: 227.—Britton & 
Brown, Ill. Fl. 1: 427. f. 1027. — Miller’s Deutsche 
