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. TRECULEANA Carriere, Rev. Hort. 1858 : 580. 1861 : 

 305. 1863:13,55. 1869 :406./. 82. Baker, Gard. 

 Chron. 187O: 828. Journ. Linn. Soc. Bot. 18 : 226. 

 Kew Bull. 1892:8. Lemaire, 111. Hort. 13:97. 

 Engelmann, Trans. Acad. St. Louis. 3:41, 55, 210, 

 212. Rev. Hort. 59: 368. /. 74. Garden. 1 : 161. 

 7:11. 8:131. 12: 328, 369. pi. 94. 35:585./. 

 Sargent, Silva. 1O : 9. pi. 498. Gardening. 4 : 371. 

 /. Coulter, Contr. U. S. Natl. Herb. 2:436. 

 Havard, Bull. Torr. Bot. Club. 23 : 37. 



Y. aspera Regel, Ind. Sem. Hort. Petropol. 1858:24. Gartenflora. 8:14, 

 35. Engelmaun, Trans. Acad. St. Louis. 3:37, 210, 212. 



F. longifolia Buckley, Proc. Phila. Acad. 1862:8. Gard. Monthly. 17: 

 69. Gray, Proc. Phila. Acad. 1862:167. 



T. Vandervinniana Koch, Belg. Hort. 1862: 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 5 m. 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 flliferous. 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 X 6 to 7 mm. Plates 52- 

 54.84,f. 8. 



South central Texas, southward to Torreon and Tam- 

 pico. Plate 95, f. 2. 



