80 MISSOURI BOTANICAL GARDEN. 



Y. FLEXILIS ENSIFOLIA (Greenland) Baker, Journ. Linn. 



Soc. Bot. 18: 224. (1880). 



F. ensifolia Greenland, Kev. Hort. 1859: 433. /. 1 29. Baker, Gard. 

 Chron. 1870: 217. Ref. Bot. 5. pi. 318. Engelmann, Trans. 

 Acad. St. Louis. 3 : 41. Hemsley, Garden. 8 : 134. /. 

 Y. Eylesii Hort. 



Taller (1 to 1.5 m.) with less recurving, soon pale green, somewhat 

 concave, entire leaves. 



Y. flexilis Hildrethi Trelease. 



Differs from f . ensifolia chiefly in having its frequently somewhat fal- 

 cate leaves usually finely flliferous in age. Plate 41, f. 2. 



Cultivated, from unrecorded source, and escaped, at the 

 place of Mr. J. A. Hildreth, at St. Augustine, Fla., where 

 it is said to bloom through the winter and where the spec- 

 cimen photographed was observed in flower at the end of 

 May, simultaneously with Y. aloifolia, though it has 

 never been known to set fruit. 



Y. flexilis tortulata (Baker) Trelease. 



Y. tortulata Baker, Gard. Chron. 1870: 1122. Engelmann, Trans. 



Acad. St. Louis. 3 : 41. Hemsley, Garden. 8: 133. 

 F. gloriosa tortulata Baker, Journ. Linn. Soc. Bot. 18 : 226. (1880). 

 T.falcata Garden. 16:369. (1879). 



Y. flexilis falcata Baker, Journ. Linn. Soc. Bot. 18:224. (1880). 

 T. undulata Hort., in part. 



Differs from f. ensifolia chiefly in being shorter-stemmed and with 

 the green leaves flatter and somewhat falcate, and from Y. gloriosa 

 minor in its longer outer leaves being reflexed. 



Y. FLEXILIS SEMICYLINDRICA Baker, Journ. Linn. Soc. Bot. 



18:224. (1880). 

 F. semicylindrica Baker, Gard. Chron. 1870: 1217. 



Differs from f . ensifolia in its firm and deeply concave narrower leaves 

 (less than 20 mm. wide). 



Y. flexilis Boerhaavii (Baker) Trelease. 



r. Boerhaavii Baker, Gard. Chron. 1870 : 1217. Journ. Linn. Soc. Bot. 



18:224. Engelmann, Trans. Acad. St. Louis. 3:41. 

 Chiefly differs from the preceding in its flat scarcely pungent leaves. 



