444 
69. Opuntia schottii greggii Engelm. Cact. Mex. Bound. t. 73, f. 4 (1859). 
Tubercles longer (20 to 24 mm.): spines stout, somewhat less rough 
and more slender, 12 to 15, some borne on upper margin of pulvinus; 
the 4 centrals triangular, much less rough, 2.5 to 4 em. long; the 8 to 
12 exterior ones of very different sizes. (JU. 1. c.)—Type, Gregg of 
1848 in Herb. Mo. Bot. Gard. 
San Luis Potosi. 
Specimens examined: Saw Luis Povost (Gregg of 1848). 
This form is described by Engelmann in Synopsis Cactacem (1856) and in Cactaces 
of the Mexiean Boundary, but with no name, the name being first given in explana- 
tion of plates in the latter work. 
70. Opuntia invicta randegee, Pl. Baja Calif. 163 (1889). 
Low and branching, about 3 dm. high: joints 10 em, long and 4 to 
7.5 em. thick: radial spines 6 to 10, slender and radiant, 6 to 10 mm, 
long (sometimes longer); central spines 10 to 15, very stout and rigid, 
quadrangular or flattened, strongly striate, ashy at base with lighter 
tips, spreading in every direction, 2.5 to 4.5 cm, long: flowers yellow, 
abundant, 5 em. broad: fruit covered with reddish spines: seeds 2mm. 
in diameter.—Type in Herb. Brandegee. 
Common about San Juanico and north to El Campo Aleman, Lower 
California. 
Specimens examined: LOWER CALIFORNIA (Brandegee). 
It is difficult in this species to distinguish exactly the line between centrals and 
radials, as they somewhat intergrade. The species is an uncertain one, and may be 
a Cereus, but it groups well enough with 0, schottii to be retained at present in 
Opuntia. 
71. Opuntia clavellina Engelm. MSS. 
Stems frutescent, about 9 dm. high: joints slender, clavate, 5 to 10 
em. long and a little over 1 em. in diameter, with elongated tubercles: 
spines 3 to 6, stout, 1 to 3.5 em. long, with straw-colored or brown 
sheaths, the central one longer and porrect: flowers yellow: fruit 
clavate, short, tubereulate.—Type, Gabb 22 and 23 in Herb. Mo, Bot. 
Gard. 
On voleanic tables, western slope of the peninsula, near Mission 
Purissima, Lower California, 
Specimens examined: LOWER CALIFORNIA (Gabb 22, 23), 
72. Opuntia tunicata (Lehm.) Pfeiff. Mnum, 170 (1837). 
Cactus tunicatus Lehm. Ind. Sem. Hort. Ham). 17 (1827). 
Suberect, very branching, 3 dm. high and 2.5 to 3.5 em, in diameter: 
joints dusky-green, clavate, almost terete, 16 to 20 mm, in diameter, 
with short leaves and depressed tubercles: pulvini with white wool: 
spines 6 to 9 (almost wanting in some localities) from lowest part of pul. 
vinus, 4 to 6 upper ones larger, 2.5 to 5 em. long, 2 or 3 lowest short (5 
to 12 mm.), all white and with a subpellucid sheath.—Type unknown. 
Throughout Mexico and the West Indies and southward through 
South America to Brazil. 
