423 
The arrangement of the bristles is somewhat peculiar, the upper and outer ones (by 
far the more numerous) being shorter and thinner and covering the upper part of the 
areola, and within these a semicircular row of stouter and longer bristles, which join 
the outer and shorter spines of the outer and lower margin of the areola, 
13. Opuntia tapona Engelm. MSS. 
Joints obovate, 20 to 25 em. long: pulvini about 5 em, apart, with 
short marginal bristles and 2 (rarely more) pale rather stout compressed 
spines 1 to 1.5 em. long: fruit elongated clavate, stipitate, densely 
tuberculate, dark-purple, 5 to 6 em. long, sterile so far as seen.—Type, 
Gabb 20a in Herb. Mo. Bot, Gard. 
Sandy soil, especially southward in Lower California. 
Specimens examined: LOWER CALIFORNIA (Wm. M. Guabb 20a, in 
1867, near Loreto). _ 
The name refers to a fancied resemblance of the fruit to a bottle- 
stopper (tapone). 
14. Opuntia larreyi Weber, MSS. 
Plant only 9 to 12 dm. high, with large orbicular glaucous joints: 
fruit ‘as large as a goose egg,” juicy, purple, and with purple pulp: 
seeds small, “‘much like those of O. ficus-indica.”—Type unknown. 
A Mexican species, found by Dr. Weber in cultivation about Queretaro, and pro- 
nounced by him the most delicious of all the fruits he had tasted. Known as 
‘‘camuessa.”’ 
15. Opuntia palmeri Engelm. MSS. 
Joints oval, smooth (not tubereulated), pale glaucous, 20 to 25 em. 
long by 15 to 20 em. broad: pulvini 2.5 to 3 cm. apart, with pale brown- 
ish or gray persistent wool, a few very slender straw-colored bristles, 
and slender flattened or compressed straw-colored spines 2.5 to 3 em. 
long (5 to 7 on upper pulvini with some smaller additional ones, 1 to 3 
on lower pulvini), erect or spreading, or the upper ones (from upper 
part of pulvinus) mostly deflexed.—Type, Palmer of 1877, in Herb, Mo. 
Bot. Gard. 
Near St. George, Utah. 
Specimens examined: Uran (Palmer of June, 1877). 
16. Opuntia pycnantha Engelm. MSS. 
Erect, with ovate-orbicular compressed scarcely tuberculate joints 
12.5 to 15 cm. long by 12.5 cm. wide, armed with densely interwoven 
mostly detlexed spines: pulvini approximate (6 to 8 mm. apart), with 
fulvous wool (becoming dusky), and weak bristles (at length elongated 
and very numerous): spines in younger joints 3-7, pale straw-color (at 
length ashy), 6 to 25 min. long, all deflexed; in older joints more numer- 
ous (as many as 20), longer and more rigid; flowers and fruit unknown.— 
Type, Agassiz of 1872 in Herb. Mo. Bot. Gard. 
Magdalena Bay, Lower California. 
Specimens examined: LOWER CALIFORNIA (Prof. L. Agassiz, Magda- 
lena Bay, collected on the Hopler expedition in 1872; Brandegee of 1889, 
Magdalena Island). 
