453 
Neighborhood of Tucson and Benson, Arizona, on mesas and foothills. 
Specimens examined: ARIzONA (Parry of 1880 and 1881; G. Engel- 
mann of 1880; Pringle of 1881; Miller of 1881: Nealley of 1891; Toumey 
of 1892, Tucson). 
This species has been distributed under this name ever since 1881, but I have been 
unable to find any published description. Toumey’s specimens have much shorter, 
more prominent, and more crowded tubercles than usual. 
91. Opuntia molesta Brandegee, Pl. Baja Calif. 164 (1889). 
Stems few, sparingly branched, 12 to 18 dm. high: cylindrical joints 
15 to 20 em. long and 2.5 em. in diameter, with few not prominent 
tubercles: spines 5 to 9, of which 1 to 3 are 2.5 to 5 cm. long, the rest 
less than 1.2 em. long, all reddish-brown to blackish, the 2 upper 
large ones divaricate, the lower one porrect or deflexed, the small and 
apparently naked ones usually at lower edge of pulvinus and deflexed: 
flower purple, 5 em. broad: fruit obovate, juicy, 2.0 to 4 em, long, not 
tuberculate or spiny, but with remnants of the woolly pulvini: seeds 
very irregular, with a swollen, warty look, the narrow commissure In a 
deep furrow, 5 to 8 mm. in diameter.—Type in Herb. Brandegee. 
San Ignacio, Lower California. 
Specimens examined: LOWER CALIFORNIA (Brandegee of 1889). 
Mr. Brandegee says that the long spines are sometimes not present, Their sheaths 
are straw-color to brownish, very loose and bladdery, giving the spines a massive 
look when unbroken. 
92. Opuntia calmalliana, sp. nov. 
Habit and height unknown: joints cylindrical, 1 to 2 cm. in diameter, 
glaucous, with linear-oblong crested (mostly distinct) tubercles 20 to 
25 mm. long: pulvini densely covered with yellowish wool, and with a 
penicillate tuft of whitish bristles at upper edge: spines usually 4, the 
upper one stout and porrect, reddish with yellowish tip (as are all the 
spines), 2 to 2.5 em. long (occasionally L or 2 short upper ones added), 
the usually 3 (sometimes 4) lower ones more slender and sharply 
detiexed, 1 to 1.5 cm. long (occasionally one of them longer): flowers 
apparently purple: ovary covered with very prominent woolly pulvini 
which are more or less bristly and spiny, but ripening into a smooth 
juicy obovate fruit: seeds discoid and beaked, irregularly angular, 
with broad commissure, about 4 mm. broad,—Type in Herb. Brandegee. 
Calmalli, Lower California. 
Specimens examined: LOWER CALIFORNIA (Brandegee of 1889). 
This species is closely related to molesta, but its spines are different, though on the 
same general plan, and its seeds are very different, 
(2) Fruit more or less spiny. 
93. Opuntia thurberi Engel. Syn. Cact. 308 (1896). 
Erect and frutescent: joints slender-cylindrical (12 mm. in diameter), 
with oblong-linear tubercles 18 mm. long: pulvini with short yellow 
wool and scarcely any bristles: spines 3 to 5, short (6 to 16 mm,), dusky, 
