ECHINOCEREUS. 35 



Type locality: El Campo Allemand, Lower California. 



Distribution: Very common on the low hills along the coast of southern Lower Cali- 

 fornia and adjacent islands. 



The species is named for Townsend S. Brandegee, a well-known botanical collector 

 and writer. 



Illustration: Contr. U. S. Nat. Herb. 16: pi. 124. 



Figure 41 is from a photograph of a plant collected by Dr. Rose at the head of Con- 

 ception Bay, Lower California, in 191 1 (No. 16672). 



47. Echinocereus hempelii Fobe, Monatsschr. Kakteenk. 7: 187. 1897. 



Plant, so far as known, simple, erect, 1.5 dm. long or more, 6 to 7 em. in diameter, dark green; 

 ribs 10, strongly tubereulate; radial spines 6, spreading, white with brown tips, aeieular, 1 cm. long 

 or less; central spines none; flowers from near the top of plant, rather large, 6 to 8 cm. broad, violet; 

 inner perianth-segments few, about 14, loosely arranged, oblong, 3 cm. long, strongly toothed above; 

 style longer than the stamens ; ovary bearing conspicuous red scales, spiny ; fruit not known. 



Type locality: Mexico. 



Distribution: Known only from cultivated plants. 



In 191 2 Dr. Rose studied this plant in Berlin and thought it might be a form of E. 

 fendleri but it has since been illustrated in color and shows some striking differences, as, for 

 instance, its lack of central spines, the strongly tubercled ribs and the very loosely arranged 

 perianth-segments. 



This species was named for George Hempel (1 847-1 904) who collected in Mexico and 

 South America. 



Illustrations: Monatsschr. Kakteenk. 7: 185; Bliihende Kakteeri3: pi. 142. 



Figure 42 is copied from the second illustration above cited. 



48. Echinocereus merkeri Hildmann in Schumann, Gesamtb. Kakteen 277. 1898. 



Cereus merkeri Berger, Rep. Mo. Bot. Gard. 16: 81. 1905. 



Cespitose; joints erect, 12 to 15 cm. in diameter, light green; ribs 8 or 9, sinuate; radial spines 

 6 to 9, white, shining ; central spines 1 or rarely 2, often yellowish, larger than the radials, red at base ; 

 flowers purple, about 6 cm. long; inner perianth-segments short-oblong, 3 cm. long, rounded at apex, 

 sometimes mucronate ; scales on ovary 2 to 3 cm. long, ovate, acuminate, bearing 2 to 5 long spiny 

 bristles in their axils. 



Type locality: Not cited. 



Distribution: Durango to Coahuila and San Luis Potosi, Mexico. 



In the original description several localities in Durango and Coahuila are assigned for 

 this species and it is possible that some other species was confused with it. 



To this species we refer Palmer's herbarium specimens from Saltillo, Mexico, 1905 

 (No. 510), and C. A. Purpus's specimen from northern Mexico; the latter we have living 

 also, and it is unlike any other plant in our collections. 



Echinocereus jacobyi (Schumann, Gesamtb. Kakteen 278. 1898), undescribed, be- 

 longs here. 



Figure 43 is from a photograph of a plant collected by Dr. C. A. Purpus in northern 

 Mexico. 



49. Echinocereus fendleri (Engelmann) Riimpler in Forster, Handb. Cact. ed. 2. 801. 1885. 



Cereus fendleri Engelmann in Gray, PI. Fendl. 50. 1849. 



Cereus fendleri pauperculus Engelmann in Gray, PI. Fendl. 51. 1849. 



Cespitose ; stems about 8, ascending or erect, 1 to 3 dm. long, 5 to 7.5 cm. in diameter; ribs rather 

 prominent, 9 to 12, somewhat undulate; spines very variable as to color, length, and form; radial 

 spines 5 to 10, more or less spreading, 1 to 2 cm. long, aeieular to subulate; central spine solitary, 

 usually porrect, 4 cm. long or less, dark colored, often black-bulbose at base; flowers borne at the 

 upper part of the plant, often very large, 10 cm. broad when fully expanded, but sometimes 



