250 PROCEEDINGS OF THE AMERICAN ACADEMY 



5. D. acrotrichum, Zucc. Described as resembling the last, with 

 panicle narrower and the floral bractlets entire. Fruit not known. — 

 Baker, 1. c. 



6. D. serratifolium, Zucc. A similar species, imperfectly known ; 

 leaves not breaking up into fibres at the end. — Baker, 1. c. 298. 



7. D. laxiflortjm, Baker, 1. c. 299. Leaves also not fibre-tipped : 

 panicle ovate-thyrsoid. Female flowers and fruit unknown. 



8. D. quadrangulatum. Caudex 3 feet high : leaves drooping, 

 dark green, 2 feet long or more, 2 or 3 lines broad at base, soon nar- 

 rower and quadrangular (nearly square in section), unarmed, scabrous : 

 scape about 5 feet high; inflorescence narrow : flowers 11 lines long, 

 on very short pedicels : fruit 3 \ to 5 lines long, the broad wings pro- 

 duced upward to the summit of the slender style : stigma-lobes spread- 

 ing : seed 2 lines long. — Sierra Nola, Tamaulipas ; Dr. E. Palmer, 

 1878: a very peculiar species. 



23. HESPEROCALLIS, Gray. 



1. II. undulata, Gray. Bulb large: stem stout, leafy, a foot or 

 two high, 5-8-flowered : leaves linear, fleshy, carinate, 3 to 6 lines 

 wide, the margin undulate: flowers \\ to 2 inches long, on short pedi- 

 cels ; segments 5-7-nerved : style exserted, the capsule acute with its 

 persistent base, sessile, a half-inch long: seeds thin, 2£ to 3 lines 

 broad. — Proc. Am. Acad. 7. 390; Baker, Trim. Journ. Bot. 11. 

 359. Colorado Desert. 



24. HESPERALOE, Engelm. 



1. H. YUCCiEFOLiA, Engelm. Stem 2 to 4 feet high, sparingly 

 branched : leaves a foot or two long, 3 or 4 lines broad, recurved, 

 long-attenuate: bracts broad and acuminate, rather large: pedicels 

 cymose-fascicled, 4 to 18 lines long: flowers a half to an inch long, 

 with erect segments : stamens somewhat shorter ; anthers small (a line 

 long) : style equalling the perianth, at length exserted, 2 or 3 or more 

 times longer than the ovary : capsule ovate, acute, an inch long. — 

 King's Rep. 5. 497. Yucca (?) parviflora, Ton*. Bot. Mex. Bound. 

 221. Aloe yucccefolia, Gray, Proc. Amer. Acad. 7. 390. W. Texas 

 (from Frio County to mouth of the Pecos). A second species from 

 the same region ha^ been proposed (If. Engelmanni, Krauskopf), but 

 is imperfectly known, perhaps to be distinguished by its more slender 

 and flexuous branches and smaller bracts, its twice longer anthers, and 

 the stouter included style scarcely longer than the ovary. 



