. Carnegie Institution of Washington publication. THE CACTACEAE. 1. Echinocereus delaetii Giirke, Monatsschr. Kakteenk. 19: 131. 1909. Cephalocereus delaetii Giirke, Monatsschr. Kakteenk. 19: 116. 1909. Low, 1 to 2 dm. high, densely eespitose, completely hidden by the long, white, curled hairs; ribs indistinct; areoles closely set, bearing 15 or more white reflexed hairs 8 to 10 cm. long and a few stiff reddish bristles; flowers appearing near top of plant; perianth-segments pink, oblanceo- late, acute; stigma-lobes about 12; ovary covered with clusters of long, white, bristly spines; fruit no
. Carnegie Institution of Washington publication. THE CACTACEAE. 1. Echinocereus delaetii Giirke, Monatsschr. Kakteenk. 19: 131. 1909. Cephalocereus delaetii Giirke, Monatsschr. Kakteenk. 19: 116. 1909. Low, 1 to 2 dm. high, densely eespitose, completely hidden by the long, white, curled hairs; ribs indistinct; areoles closely set, bearing 15 or more white reflexed hairs 8 to 10 cm. long and a few stiff reddish bristles; flowers appearing near top of plant; perianth-segments pink, oblanceo- late, acute; stigma-lobes about 12; ovary covered with clusters of long, white, bristly spines; fruit not seen. Type locality: Not cited. Distribution: Known only from Sierra de la Paila, north of Parras, Mexico. This is the most remarkable species in the genus; in aspect it resembles small plants of Cephalocereus senilis, and owing to this resemblance it was first described as a Cephalo- cereus. Its flowers, however, are so different from those of that genus that as soon as they were seen the plant was at once transferred to Echinocereus. The plant is now largely imported into Europe and can be obtained from many dealers; it was named in honor of Frantz de Laet, a Belgian cactus dealer, who had imported many plants from Mexico through Dr. C. A. Purpus and other collectors. Illustrations: Monatsschr. Kakteenk. 19: 119, as Cephalocereus delaetii; Monats- schr. Kakteenk. 22: 73; Rev. Hort. Beige 40: after 184. Text-figure 1 is from a photograph of the plant received from M. de Laet. 2. Echinocereus scheeri (Salm-Dyck) Riimpler in Forster, Handb. Cact. ed. 2. 801. 1885. Cereus scheeri Salm-Dyck, Cact. Hort. Dyck. 1849. 190. 1850. Cespitose; stems procumbent, prostrate or ascending, decidedly narrowed towards the tip, 10 to 22 cm. long, yellowish green; ribs 8 to 10, rather low, not at all sinuate, somewhat spiraled; spines 7 to 12, acicular, white with brown or blackish tips; flowers 12 cm. long, rose-red to crimson, with an elongated tube; perianth- segments oblanceolate, acute; fr
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