. The Cactaceae : descriptions and illustrations of plants of the cactus family. 4 The cactaceae. The generic name is from ayKtarpov fish-hook, and kclktos cactus, referring to the -long, hooked central spines. Ancisirocactus was used by Schumarm for a subgenus of Echinocactus. We recognize three species in the genus, occiuring in southern Texas and northern Mexico. Coulter (Contr. U. S. Nat. Herb. 3: 368, 369) calls attention to grooved areoles of Echinocactus brevihamahis resembling those of Coryphantha and Echinocactus scheeri. Key to Species. Radial spines 20 or more, strongly appressed, p
. The Cactaceae : descriptions and illustrations of plants of the cactus family. 4 The cactaceae. The generic name is from ayKtarpov fish-hook, and kclktos cactus, referring to the -long, hooked central spines. Ancisirocactus was used by Schumarm for a subgenus of Echinocactus. We recognize three species in the genus, occiuring in southern Texas and northern Mexico. Coulter (Contr. U. S. Nat. Herb. 3: 368, 369) calls attention to grooved areoles of Echinocactus brevihamahis resembling those of Coryphantha and Echinocactus scheeri. Key to Species. Radial spines 20 or more, strongly appressed, pectinate; flowering areoles naked i. .-1. megarhizas Radial spines 18 or fewer, more or less spreading, hardly pectinate; flowering areoles woolly. Groove half length of tubercle: flower greenish; radial spines 15 to 18 scheeri Groove extending full length of tubercle; flower rose-colored; radial spines usually 12. breviliamalus 1. Ancistrocactus megarhizus (Rose). Echinocactus megarhizus Rose, Contr. U. S. Nat. Herb. 12: 290. 1909. Solitary or in clusters of 3 or 4; plant bod}^ nearly globular or a little elongated, 5 to 8 cm. high, usually , from large and flesh}' roots; ribs spiral, divided into dark-green tubercl-s, 4 to 5 -ti^f^ 3* ^Wl^'Wtesi. Fig. I.—Ancistrocactus megarhizus. cm. high; radial spines 20 or more, pectinate, at first pale yellow, in age white; in seedlings the spines pubescent; central spines usually 4, the 3 upper similar to the radials, although a little stouter and in young areoles not easily distinguished from them, the lower central spines stout and strongly hooked, 15 mm. long; flowers not seen; fruit green, suggesting that of a Coryphantha, clavate, bearing a few naked scales near top; seed black, smooth, shining. Type locality: Near Victoria, Mexico. Distribution: Known only from the type locaHty. Text-figure i is from a photograph of the type specimen collected by Dr. Edward Palmer. 2. Ancistrocactus scheeri (Sakn-Dyck). Echi
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Keywords: ., bookauthorbrittonnathaniellord1, bookcentury1900, bookdecade1910
