52 MISSOURI BOTANICAL GARDEN. 
somewhat decurrent: prickles brown, moderately distant, minute, tri- 
angular with the cusps upcurved above and recurved below. Inflor- 
escence, flowers and fruit unknown. 
Pacific Islands of middle Lower California.—Disjuncta,— 
isolated, because of its occurrence apart from what appear to 
be its closest relatives.—Map (I). 
Specimens examined :—San Benito Island (Rose, 47, 1911, 
—small living plants only). 
Closely comparable, in young specimens, with A. dentiens 
only, from which it differs in its firmer more acicular prick- 
les: differing from other known Deserticolae in the small 
size of its prickles. 
AGAVE DESERTI Engelmann, Trans. Acad. St. Louis. 3: 310, 
370. 1875; Bot. Works. 309, 316.—Gartenflora. 25 : 154.— 
L. de Smet, Cat. 10: 1, 31, 33.—Baker, Gard. Chron. n. s. 
7; 717; Handbook Amaryllid. 172; ‘Kew Bull. 1892: 
3, and Add. Ser. 2: 219.— Ricasoli, Bull Soc. Tose. Ort. 
3; 212.—Peacock, List. 2.—Palmer, Amer. Journ. Pharm. 
50; 588.— Oreutt, Gard. & For. 3; 450; W. A. Sci. 
6:22; 7:95.—Terracciano, Primo Contributo. 49.— 
Nicholson, Dict. 1: 40; Dict. Prat. 1; 82.—Dodge, Rept. 
Fiber Invest. 9:46. f. 10.— Mulford, Rept. Mo. Bot. 
Gard. 7: 79. pl. 833-34.—Kew Hand List Tend Monocot. 
111.—Rose in Bailey, Cyclop. 1: 34.—Segura, El Maguey. 
4 ed. 72.—? Braun, Pflanzer. 2: 219.—Endlich, Beihefte 
Tropenpfil. 9: 279.— Mittheil. D. Dendrol. Ges. 2 ed. 
191.—Abrams, Bull. N. Y. Bot. Gard. 6: 321. 
A. americana Emory, Notes Milit. Recon. 104, 152. 1848. 
A. deserti humilis L. de Smet, Cat. 10:1, 31, 33. 
Densely cespitose, acaulescent. Leaves gray, sometimes trans- 
versely banded, slightly granular-roughened, triangular-lanceolate, 
gradually acute, openly concave becoming rather channeled near the 
end, about 5X 15-30 cm., faleately ascending: spine from dull brown — 
becoming gray, compressed-conical or acicular, nearly straight, about — 
330 mm., round-grooved below the middle or involute: prickles . 
similarly colored, rather friable, 5-10 mm. apart, 8-4 mm. long, tri- 
angular, mostly reflexed, hardened onto the tops of low fleshy prom- — 
inences between which the margin is nearly straight. Inflorescence ~ 
2-8 m. high, the top, only, paniculate: scape slender: bracts sepa- 
rated, ascending: branches few, short, ascending, compactly short- 
