THE YUCCEAE. 29 



REVISION OF THE YUCCEAE. 



The genera constituting the group appear to admit of 

 most natural limitation as follows : 



Flowers oblong or narrowly campanulate, scarcely 15 mm. wide, rosy- 

 red or greenish: filaments shortly adnate to the petals below, 

 slender, erect, inflexed at apex; anthers oblong: style filiform, 

 minutely papillate about the scarcely enlarged stigma. Hesperaloe. 

 Flowers globose or broadly campanulate, spreading to a width of 50 to 

 100 mm., white or creamy, often tinged with green, bronze or 

 violet : filaments clavately enlarged ; anthers shortly sagittate. 

 Style filiform, abrupt; stigma capitate, long-papillate : filaments ad- 

 nate to the petals below, erect. Hesperoyucca. 

 Style stout or wanting, gradually if at all narrowed; stigma openly 

 perforate, not papillate, more or less deeply 6-notched : fila- 

 ments mostly outcurved at apex. 

 Perianth polyphyllous, or the segments barely connate at base, 



to which the filaments are slightly attached. 

 Segments of perianth thick, mostly inflexed: style wanting: 

 nectar glands in walls of ovary small. Clistoyucca. 

 Segments thin and petaloid, spreading at night: style evi- 

 dent : nectar glands large but mostly inactive. Yucca. 

 Perianth gamophyllous and tubular below, the stamens inserted 

 in its throat, otherwise as in Yucca. Samuela. 



HESPERALOE Engelmann. 



Perianth oblong or narrowly campanulate, of subequal 

 closely applied distinct oblong succulent segments out- 

 curved at tip. Filaments adnate to base of perianth, 

 slender, erect, inflexed at apex; anthers oblong, introrse. 

 Ovary ovoid, shorter than the long slender style ; stigma 

 not enlarged, minutely papillate and perforate. Fruit 

 capsular, globose-oblong, rugose-veiny, 3-celled, 6- 

 valved at least above, the valves with short solid erect 

 beak. Seeds thin, flat: albumen not ruminated. 

 Subacaulescent plants with filiferous-margined long con- 

 cave striate scarcely pungent smooth leaves, and loosely 

 panicled few-branched inflorescence. 



SYNOPSIS OF SPECIES. 



Flowers rosy-red or salmon-colored. H. parviflora. 



Flowers green, tinged with purple. . H. funifera. 



