ENGELMANN — NOTES ON THE GENUS YUCCA. 41 



gracefully recurved leaves. Y. recurva, Haw., and Y. ftendula, 

 Sieb. and Carriere, are synonymous, and Y. sufierba, Haw., Y. 

 rufocincta, Haw., seem not to differ. Y. ensifolia, Baker, Ref. 

 bot. V. t. 317, and the smooth-leaved Y. Ellacombii, Baker, Gard. 

 Chron. 1. c, Ref. bot. ib. t. 318, are intermediate forms connect- 

 ing this variety with the typical plant. 



V ar. plan 1 [folia is also based on a single specimen, which I 

 found in September, 1868, in flower in the botanic garden of 

 Genoa, under the name of Y. glauca. Its short trunk, long and 

 narrow (2? feet long, \\ inches wide), even, not at all plicate, 

 leaves, and especially the short stigma, which is almost as thick 

 as the ovary and resembles that of Y. aloifolia, distinguish this 

 form. Flowers whitish, smaller, 2 or 22 inches wide; filaments 

 as long as the pistil ; anthers small, entire above ; ovules only 

 0.26 mm. thick ; fruit unknown. Could it be the T. glauca of 

 gardens ? 



Yucca jlexilis, Carr, Rev. Hort. viii. t. 89, to which Mr. Baker 

 refers his Y. pruinosa, Gard. Chron. I.e., and Y. tortulata, Baker, 

 ib., may be smooth-leaved forms of Y. gloriosa ; they are thus 

 far only known as acaulescent, and in foliage only. Leaves of 

 both 2-22 feet long, \\ inches wide, stiff and pungent ; the edges 

 serrulate towards the narrowed base. 



Yucca Boerhaavii, Baker, Gard. Ch. 1870, p. 121 7 : caulescens, 

 e basi latissima lanceolato-linearibus elongatis infra vix angustatis 

 planis lawissimis, in mucronem herbaceum mollem excurrentibus. 



This plant makes a short trunk ; leaves 27 inches long, about 

 9 1. wide, with traces of marginal denticulation ; flowers are un- 

 known. — It may be an extreme form of 7". gloriosa. 



Yucca DeSmetiana, Baker, 1. c. : caulescens, foliis plurimis 

 lanceolato-linearibus brevibus, versus basin angustiorem obsolete 

 denticulatis crassis lasvissimis in mucronem vix pungentem excur- 

 rentibus. 



This little plant is cultivated in many gardens, but has, I be- 

 lieve, never flowered. The very fleshy purplish-green leaves are 

 only 10-15 inches long, 6-9 lines wide, and scarcely pungent. Its 

 native country is unknown. 



5. Yucca Treculiana, Carriere, Rev. Hort. vii. p. 280, 

 185s, Baker, Gard. Ch. 1. c. p. S28 : caule elato ramoso ; foliis 

 longissimis rigidissimis profunde concavo-canaliculatis margine 

 brunneo serrulatis tunc integris demum parce filamentosis pun- 



