. The Cactaceae : descriptions and illustrations of plants of the cactus family. ECHINOCEREUS. 39 Collected near Saltillo, Coahuila, April 1898, by Dr. E- Palmer (No. 100). This species is common in Coahuila and Chihuahua, Mexico, having been repeatedly collected by Dr. Palmer and others. It is characterized by its stout, stubby habit and by its very long, usually stiff, often bluish spines. Figure 47 is from a photograph of a plant collected by Dr. E. Palmer in Mexico in 1908. 54. Echinocereus dubius (Engelmann) Riimpler in Forster, Handb. Cact. ed. 2. 787. 1885. Cereus dubius Engelmann, Proc
. The Cactaceae : descriptions and illustrations of plants of the cactus family. ECHINOCEREUS. 39 Collected near Saltillo, Coahuila, April 1898, by Dr. E- Palmer (No. 100). This species is common in Coahuila and Chihuahua, Mexico, having been repeatedly collected by Dr. Palmer and others. It is characterized by its stout, stubby habit and by its very long, usually stiff, often bluish spines. Figure 47 is from a photograph of a plant collected by Dr. E. Palmer in Mexico in 1908. 54. Echinocereus dubius (Engelmann) Riimpler in Forster, Handb. Cact. ed. 2. 787. 1885. Cereus dubius Engelmann, Proc. Amer. Acad. 3: 282. 1856. Somewhat cespitose; stems 12 to 20 cm. long, pale green, of a soft flabby texture, 7 to 9-ribbed; ribs broad; spines white; radial spines 5 to 8, 12 to 30 cm. long; centrals 1 to 4, to cm. long, angled, often curved; flowers pale purple, 6 cm. long or more, with rather few and narrow perianth- segments; scales on flower-tube bearing 1 to 3 white bristles in their axils; fruit very spiny, to 3 cm. long; seeds covered with confluent Fig. 48.—Flower of Echinocereus dubius. Fig. 49.—Flower of Echinocereus enneacanthus. Type locality: Sandy bottoms of the Rio Grande at El Paso. Distribution: Southeastern Texas, perhaps confined to the El Paso region. This is said by Engelmann to be near Echinocereus stramineus and E. enneacanthus. The former, however, grows in the mountains and must be quite distinct. It is given a wide range by Schumann, who doubtless has included specimens of one or more related species. We know it only from co-type herbarium specimens of the Mexican Boundary Survey. Illustrations: Cact. Mex. Bound, pi. 50, as Cereus dubius; Ann. Rep. Smiths. Inst. 1908: pi. 9, f. 3. Figure 48 is copied from a part of the first illustration above cited. 1890. 55. Echinocereus* conglomerates Forster, Gartenflora 39:465. Cereus conglomerates Berger, Rep. Mo. Bot. Gard. 16: 81. 1905. Cespitose, forming large clumps; joints simpl
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