Pterocactus hickenii sp nov

Rootstocks moniliform, consisting of at least 4 joints widely separated; joints above ground 2 or 3, 2 to 3 cm. long, almost hidden by the spines; spines from each areole numerous, slender, yellow above, brown at base; glochids numerous; fruit and flower not known; seeds thick, 5 mm. in diameter, with narrow lateral wing.

Collected by Cristobal M. Hicken (No. 3284) January 10, 1914, near Comodoro Rivadavia, southeastern Chubut, Argentina.

Figures 3 1 and 32 represent a plant and a seed from the specimen above cited

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