Specimens examined: Mexican specimens from Hort. Dyck in 1857;
from Hort. Pfersdorff in 1869; and growing in Mo. Bot. Gard. 1893
(from material sent by Pringle from San Luis Potosi).

++ The single central spine shorter than the radials (in C.
longimamma centrals often more than one and somewhat
longer).

34. Cactus gabbli, sp. nov.

Mamillaria gabbii Engelm Mss.

Globose, 5 to 10 cm. in diameter, simple: tubercles cylindrical,
slender, 12 to 14 mm. long, with woolly axils: radial spines
about 13, 5 to 8 mm. long, lower ones longer and stouter,
especially the lateral ones pectinate; the central shorter,
straight, and robust: flowers small, yellowish-red: fruit
unknown. Type in Herb. Mo. Bot. Gard.

Among rocks, from San Ignacio to Mission San Fernando, Lower
California, and "perhaps farther north in the interior."

Specimens examined: Lower California (W. M. Gabb 19 of 1867).

35. Cactus sphaericus (Dietr.) Kuntze, Rev. Gen Pl. 261 (1891).

Mamillaria sphaerica Dietr. Allg. Gart. Zeit xxi. 94 (1853).

Obovate or clavate, 5 cm. or more high, proliferous and at length