OF ARTS AND SCIENCES. 249 
22. DASYLIRION, Zuce. 
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. — 
Linnea, 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 
(Bischoff; Rothrock, n. 329, 655) and southwestern New Mexico 
(Emory). 
Mexican Species. 
3. D. BerRLANDIERI. 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. 
