THE YUCCEAE. 57 



the name Y. angustifolia ft. radiosa, which varietal name, 

 two years later, he replaced by the varietal name elata which 

 was still later applied specifically by him. 



With Mr. Baker, and against the opinion of Engelmann, 

 Professor Sargent identifies this plant with the earlier 

 Y. constricta of Buckley and applies the latter name to it. 

 As has been stated above, however, there is reason to 

 believe that Y. constricta is really a distinct species of more 

 eastern and northern range, and to the present one the name 

 radiosa, first used varietally by Engelmann, is applicable as 

 a specific name. 



As in Y. glauca, the fruit of this species is stout, oblong, 

 and unusually symmetrical among the capsular species, and 

 it is here very smooth and of a clear straw-color at matur- 

 ity, and the seeds are exceptionally large. The leaves, 

 which are usually about 6 mm. wide, occasionally reach a 

 minimum of 3 mm. and a maximum of about 12 mm., but 

 both the broad- and narrow-leaved trees occur associated 

 with the usual form, from which they do not appear other- 

 wise distinguishable. 



So far as can be told from young leaves from Mr. Baker, 

 in the Engelmann herbarium, Y. polyphylla Baker,* 

 which its author subsequently f treated as a synonym of 

 Y. radiosa, under the name Y. constricta, is more 

 likely to have been based on an immature and aberrant 

 garden seedling of Y. fiUfera than one of the representa- 

 tives of this group, since the leaf possesses a distinct 

 brown margin, very different from the white margin of 

 Y. radiosa and its allies, which at most very exceptionally 

 has a narrow brown line between the white border and 

 the green body of the leaf. Though Y. alba-spica (or 

 albospica as it is commonly written) seems to refer to the 



* Gard. Chron. 1870 : 1088. 



t Journ. Linn. Soc. Bot. 18 : 229. 



