Hamatocactus gen nov

Globose to short-cylindric, of flabby texture like an Echinocereus, distinctly ribbed, the ribs more or less spiraled; areoles circular; spines radial and central, one of them usually hooked; flower-bud pointed, covered with imbricating scales; flower-tube narrow, funnelform; limb broad; scales on the ovary few, fugacious, small, naked in their axils; fruit small, globular, red, dehiscing by a basal pore; seeds black, tuberculate; hilum large, basal, circular; embryo straight; cotyledons short and thick.

Echinocactus setispinus Engelmann, the only species here recognized, is the type.

Although this plant heretofore always passed as an Echinocactus its anomalous characters have been recognized, such as the texture of the fleshy stem, the fruit, and the seeds; Engelmann in his Synopsis of the Cactaceae thus spoke of it: "The compressed ribs, setaceous spines, small red berry, and tuberculated seeds easily distinguish it from all its allies."

The generic name is from hamatus hooked, and cactus, referring to the hooked central spine.

Figs. 110 and 111.—Fruit and flower of Fig. 112.—Hamatocactus setispinus.

Hamatocactus setispinus. X0.8.

Figs. 110 and 111.—Fruit and flower of Fig. 112.—Hamatocactus setispinus.

Hamatocactus setispinus. X0.8.

Continue reading here: Hamatocactus setispinus Engelmann

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