THE AGAVES OF LOWER CALIFORNIA. 59 
found on one should not occur on the other or on the main- 
land, nor is there evident reason for specific differentiations. 
It is, therefore, with considerable hesitancy that, because 
of the very different arming of the specimens collected, a 
second species is recognized for these islands. 
Agave Roseana Trelease. 
Somewhat cespitose, acaulescent. Leaves glaucous gray-green, the 
neck somewhat transversely banded, smooth, broadly lanceolate, some- 
what acuminate, openly concave, as much as 15 < 50 em., stiffly 
somewhat spreading: spine from glaucous purplish chestnut becoming 
dull ashen, compressed-acicular, tortuous, 3-4 >< 50-70 mm., round- 
grooved to or beyond the middle, decurrent: prickles from glaucous 
brown soon becoming pinkish drab or creamy, about 30 mm. apart, © 
10-25 mm. long and sometimes 10 mm. wide, mostly broadly triangular, 
variously and very irregularly curved, hooked or doubly flexed, usually 
rather abruptly or lunately dilated, sometimes to a width of 15 mm., 
onto the tops of large fleshy prominences between which the margin 
is either straight or very concave. Inflorescence 2-3 m. high, nar- 
rowly paniculate at top: scape slender: branches very compactly 
short-branched at the end: pedicels slender, varying from 2-7 mm. in 
length. Flowers 40-50 mm. long: ovary 25-30 mm. long, fusiform- 
oblong: tube saucer-shaped, 2-3 mm. deep: segments 3 >< 12-15 mm., 
very much longer than the tube and half as long as the ovary: fila- 
ments inserted nearly in the throat, 30-35 mm. long, more than twice 
as long as the segments. 
Southeastern Lower California.—Roseana,—J. N. Rose, a 
critical student and expert collector of many groups of North 
American plants, whose field work is a model for those de- 
sirous of advancing knowledge of such difficult plants as the 
present genus offers.— Map (S). Pl. 58-60. 
Specimens examined:=-La Paz (Brandegee, Apr. 14, 
1892). On peninsula opposite Pichilinque Island (Rose, 
16524, Mar. 28, 1911). Espiritu Santo (Rose, 16854, Apr. 
18, 1911,—the tyne). 
es remarkable species, alike in its very slender long tor- 
tuous spine—sometimes long-continued by the similarly 
wavy horny-margined leaf-tip, and its very large flat mar- 
ginal teeth,—in both respects recalling some of the marginate 
Littaeas. 
