96 MISSOURI BOTANICAL GARDEN. 
rials being abundant and apparently more easily manufac- 
tured. 
M. Pittier informs me that in Costa Rica, everywhere on 
the central plateau as well as on the Pacific slope a Yucca 
called ‘‘Itavo’’ or ‘‘ Itabo’’ is cultivated as a hedge plant 
and its flowers sold for the table, and it is doubtless this 
species, though I have been unable to see material repre- 
senting it. 
22. Leaves from sparingly denticulate becoming sparingly filiferous, 
thick and firm. 
Y. Trecuuieana Carriére, Rev. Hort. 1858:580. 1861: 
805. 1863:13,55. 1869:406. f. 82.—Baker, Gard. 
Chron. 1870: 828. Journ. Linn. Soc. Bot. 18 : 226. 
Kew Bull. 1892 :8.— Lemaire, Ill. Hort. 18:97. — 
Engelmann, Trans. Acad. St. Louis. 3:41, 55, 210, 
212.—Rev. Hort. 59: 368. f. 74. — Garden. 1: 161. 
7:11. 8:181. 12:328, 369. pl. 94. 35:585. f.i— 
Sargent, Silva. 10:9. pl. 498.— Gardening. 4: 371. 
f.—Coulter, Contr. U. S. Natl. Herb. 2:4386.— 
Havard, Bull. Torr. Bot. Club. 28: 37. 
Y. aspera Regel, Ind. Sem. Hort. Petropol. 1858:24. Gartenflora. 8;14, 
85. — Engelmann, Trans. Acad. St. Louis. 8:37, 210, 212. 
Y. longifolia Buckley, Proc. Phila. Acad. 1862:8. Gard. Monthly. 17: 
69.— Gray, Proc. Phila. Acad. 18623167. 
Y. Vandervinniana Koch, Belg. Hort. 18623 131. 
Y. argospatha Verlot, Rev. Hort. 1868: 393. — Belg. Hort. 1870: 23. 
Y. contorta Hort. 
Y. cornuta Hort. 
Y. agavoides Hort. 
Simple or loosely few branched tree usually under 5m. high. Leaves 
thick and rigid, very concave, blue-green, shagreen-roughened, pungent, 
.9 to 1.25 m. long, 25 to 50 mm. wide, brown margined, entire or irregu- 
larly denticulate, soon becoming sparingly and finely filiferous. Inflores- 
cence usually short-stalked, glabrous, with large bracts below. Flowers 
white, occasionally tinged with purple: style slightly contracted, short: 
stamens quickly hooked. Fruit oblong: seeds 5 6 to7 mm. — Plates 52- 
54. 84, f. 8. 
South central Texas, southward to Torreon and Tam- 
pico. — Plate 95, f. 2. 
