ECHINOCEREUS. 
7 
3 . Echinocereus salm-dyckianus Scheer in Seemann, Bot. Herald 291. 1856. 
Cereus salm-dyckianus Hemsley, Biol. Centr. Amer. Bot. 1: 545. 1880. 
Echinocereus salmianus Riimpler in Forster, Handb. Cact. ed. 2. 809. 1885. 
Cereus salmianus Weber, Diet. Hort. Bois 279. 1894. 
Cespitose; stems more or less decumbent, 2 to 4 cm. in diameter, elongated, yellowish green; 
ribs 7 to 9, low, more or less sinuate; radial spines 8 or 9, acicular, yellowish, about 1 cm. long; 
central spine solitary, porrect, a little longer than the radials; flowers orange-colored, 8 to 10 cm. 
long, narrow, the tube elongated, the areoles of the flower-tube and ovary bearing white bristly 
spines and cobwebby hairs; perianth-segments oblanceolate to spatulate; filaments dark red; style 
longer than the stamens; fruit not seen. 
Type locality: -Near Chihuahua. 
Distribution: States of Chihuahua and Durango, Mexico. 
This species is in cultivation in Europe, and Dr. Rose saw it in flower at Ea Mortola 
in 1912; it was also collected by Dr. E- Palmer in Durango in 1906 (No. 205). 
Fig. 2. — Echinocereus scheeri. Fig. 3. — Echinocereus salm-dyckianus. 
We have not been able to see the type specimen and it is probably not in existence. 
The specific name commemorates Joseph Franz Salm-Reifferschid-Dyck (1773—1861), 
author of several important cactus treatises. He was the most distinguished cactologist 
of his time and possessed at his estate at Diisseldorf, Germany, one of the largest cactus 
collections ever brought together. Unfortunately, after his death the collection was 
permitted to disintegrate and most of his types were lost or thrown away. 
Hybrids between E. salm-dyckianus and Heliocereus speciosus and with Epiphyllum 
species are reported. 
Illustrations: Bliihende Kakteen 1: pi. 29; Monatsschr. Kakteenk. 3: 129; Wildeman, 
Icon. Select. 6: pi. 202. 
Text-figure 3 shows a part of the first illustration above cited. 
