OF ARTS AND SCIENCES. 249 



22. DASYLIRION, Zucc. 



1. D. Texanum, Scheele. Caudex 2 to 5 feet high, bearing a 

 dense rosette of leaves and a flowering stem 8 or 10 feet long : leaves 

 light-green, 3 or 4 feet long, 4 or 5 lines broad below and attenuate 

 upward, splitting into coarse fibres at the apex, the serrulate margin 

 armed with hooked teeth a line long and 3 to 6 lines apart ; the dilated 

 base narrowed gradually into the leaf, entire : panicle 2 or 3 feet long, 

 very narrow ; the partial panicles erect or suberect and about 3 inches 

 long, equalling the broad subtending bracts ; racemes an inch or two 

 long, ascending : floral bractlets broadly ovate, acute, lacerately toothed, 

 about a line long : perianth a line long : fruit 3 to 3£ lines long, on 

 pedicels a line long, broadly elliptical, the rather narrow wings con- 

 tinued above and adnate to the style (or attenuate apex of the body) its 

 whole length : seed (immature) 1^ lines long, acute at both ends. — ■ 

 Linnsea, 23. 140. D. graminifolium, Baker, Trim. Journ. Bot. 10. 

 297, mainly. W. Texas and Eastern New Mexico. 



2. D. Wheeleri, Watson. Similar in size (12 to 14 feet high) 

 and habit : leaves 7 to 9 lines broad, with brown-tipped teeth : racemes 

 longer (2 to 4 inches), flexuous and usually pendent : fruit narrowly 

 obcordate, 4 lines long, on pedicels a line or two long, the wings adnate 

 only to the base of the style and prolonged above it in divergent ob- 

 tuse lobes a line long: seed 2 lines long, acutish. — Rothrock, Wheeler's 

 Rep. 6. 379. D. graminifolium, Rothr. 1. c. 6. 272. S. Arizona 



, (Bisckoff; Rothrock, n. 329, 655) and southwestern New Mexico 

 (Emory). 



Mexican Species. 



• 3. D. Berlandieri. Only the fruiting panicle known. Racemes 

 stout, spreading, 2 inches long : floral bracts equalling or exceeding the 

 pedicels, 2 or 3 lines long, broadly lanceolate, acute, nearly entire : 

 perianth-segments 2 to 2 \ lines long : fruit very broadly winged (sub- 

 orbicular) ; summits of the wings broad and divergent, the free por- 

 tion of the style and the stigmas a line long. — N. E. Mexico (Nuevo 

 Leon, Berlandier, n. 3218). 



4. D. graminifolium, Zucc. Resembling D. Texanum ; base of 

 the somewhat shorter glaucous leaves abruptly contracted and spine- 

 toothed above : staminate spikes thicker : body of the fruit less 

 attenuate above and wings free from the style. — Collected in flower 

 and fruit by Parry & Palmer (n. 876) in the mountains near San 

 Luis Potosi. 



