4(5 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. 1". baccata. 



Arborescent. Flowerg of average size. 



Style elongated. Y. macrocarpa. 



Style short. Y. Mohavensis. 



SYNOPSIS OF SPECIES. 



A. Fruit erect, capsular, dehiscent. Seeds thin, flat, margined: albu- 

 men not ruminated. Chaenoyucca. 



1. Leaves finely flliferous 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. FILAMENTOSA Linnaeus, Sp. PL 319. (1753). 

 Walter, Fl. Carol. 124. Michaux, Fl. 1:196. 

 Pursh, Fl. 1 : 227. Gawler, Bot. Mag. 23. pL 

 900. Redout^, Liliacees. 5. pi. 277-8. Haworth, 

 Syn. PI. Succ. 70. Gambold, Amer. Journ. Sci. 

 1819 : 251. Mordaunt, Herb. Gen. 4. pi. 258. 

 Elliott, Bot. S. C. and Ga. 1 : 400. Frost, Plants 

 Abbeville Distr. 317. Lemaire, 111. Hort. 13 : 98. 

 Porcher, Resources So. Fields and For. 530. 

 Curtis, Bot. N. C. 56. Engelmann, Trans. Acad. 

 St. Louis. 3 : 52, 214. Baker, Gard. Chron. 187O: 

 923. Journ. Linn. Soc. Bot. 18: 227. Britton & 

 Brown, 111. Fl. 1 : 427. /. 1027. Holler's Deutsche 



