48 MISSOURI BOTANICAL GARDEN. 
cated, suberect: branches rather few, stout, ascending, compound: 
pedicels 5- often 10 or 15 mm. long. Flowers yellow, less densely 
aggregated than in A. Shawit, 60-85 mm. long: ovary 35-50 mm. long, 
oblong-fusiform: tube very openly conical, 12-17 mm. deep; segments ~ 
attenuate, about 9X 20 mm., longer than the tube but little more 
than half as long as the ovary: filaments inserted about the upper . 
third of the tube, 50 mm. long, more than twice as long as the seg- 
ments. Capsules with hard thick walls, very large, about 30 60-80 
mm., beaked but scarcely stipitate: seeds very large and glossy, 7 
11 mm. 
Coast of west-central Lower California.—Sebastiana,—from 
its occurrence about Sebastian Viscaino Bay—Map (C). PI. 
23-26. 
Specimens examined:—Cedros Island (Greene, May 1, 
1885,—a co-type; Brandegee, Apr. 1, 1897; Rose, 16122, 
Mar. 10, 1911). San Benito Island (Anthony, 264 ,1897; 
Rose, 16041, Mar. 9, 1911). Sta. Rosalia Bay (Anthony, 
145, Aug. 16, 1896). 
Young plants collected on Cedros Island by Dr. Rose un- 
der his field number 122, and grown at the New York 
Botanical Garden under the number 34174, for which, as for 
living representatives of nearly all of Dr. Rose’s agaves of 
1911 I am indebted to him and Professor Britton, are de- 
cidedly granular-roughened, and rather noticeably lined 
with darker green over the fibro-vescular bundles which are 
closely surrounded by chlorenchyma. In variation of outline 
and marginal arming this and the following differ from the 
two preceding species, from either of which some leaves are 
indistinguishable. 
Agave pachyacantha Trelease. 
Aspect of A. Shawii. Leaves smooth, rather gray, elliptical or 
broadly lanceolate, acuminate, 10-12 25-40 or even 75 cm.: spine 
nearly straight, stoutly conical, chestnut becoming dull or brownish 
gray, 6-9 < 25-40 mm., very openly grooved, long-decurrent: prickles 
similarly colored, about 15 mm. apart, large, about 10 mm. long, pre- 
vailingly retrorsely curved, heavily triangular, rather abruptly widened 
into the margin or where this is repand their heavy bases lunately 
dilated to a width of 10-15 mm. on the tops of the fleshy prominences. 
Inflorescence paniculate: pedicels about 5 mm. long. Flowers 75-80 
mm. long; ovary about 35 mm. long, subfusiform-oblong: tube conical, 
15 mm. deep: segments gradually acuminate, 7-8 X 25-30 mm., nearly 
