8 



THE CACTACEAE. 



4. Echinocereus huitcholensis (Weber) Gurke, Monatssehr. Kakteenk. 16: 23. 1906. 



Cereus huitcholensis Weber, Bull. Mus. Hist. Nat. Paris 10: 383. 1904. 

 Plants 4 to 6 cm. long, 2 to 4 cm. in diameter; radial spines 10 to 12 ; central spine usually soli- 

 tary; flowers 11 cm. long or less, narrow, with a pronounced tube; color of perianth-segments un- 

 certain but perhaps orange, as in E. salm-dyckianus; spines on ovary and tube weak, acicular; areoles 

 of flower-tube bearing long cobwebby hairs. 



Type locality: Sierra de Nayarit, Jalisco, Mexico. 



Distribution: Known only from the type locality. 



Weber described it as a Cereus, but without seeing flowers or fruit, basing it on the 

 collection of L. Diguet of 1900. Three sheets of this collection are in the herbarium of 

 the Museum of Paris, and with them are a flower, immature fruit, and two plants of another 

 species, perhaps undescribed. 



5. Echinocereus pensilis (K. Brandegee) J. A. Purpus, Monatssehr. Kakteenk. 18: 5. 1908. 



Cereus pensilis K. Brandegee, Zoe 5: I9 2 - 1904. 



More or less cespitose; the stems often erect, 30 cm. high or, when growing on cliffs, hanging, 

 and then nearly 2 meters long, 3 to 4 cm. in diameter; ribs 8 to 10, low; areoles about 10 mm. apart; 

 spines needle-like, at first yellow, becoming reddish gray, the longest not over 2 cm. long; radial 

 spines about 8; central spine 1; flowers orange-red, narrow, 5 to 6 cm. long; areoles on ovary and 

 tube bearing short, yellow or white wool and chestnut-colored bristly spines; fruit globular, 1.5 to 

 2 cm. in diameter; seeds black, rugose, very oblique at base. 



Type locality: Sierra de la Laguna, Lower California. 



Distribution: High mountains of the Cape region of Lower California. 



This species is unlike most of the known Lower Californian species in that it grows 

 in the high mountains of the Cape region and is in fact more closely related to the species 

 of the mountains of the United States and Mexico than to any of its near neighbors. It is a 

 beautiful plant; Dr. Rose saw it in flower in Darmstadt in June 191 2, where it was grown 

 from a hanging basket. 



The type specimen is in the Brandegee 

 Herbarium at the University of California, but 

 a duplicate and a photograph of the type 

 are preserved in the United States National 

 Herbarium. 



Illustration: Monatssehr. Kakteenk. 18: 3. 



6. Echinocereus mojavensis* (Engelmann and Bige- 



low) Riimpler in Forster, Handb. Cact. ed. 2. 

 803. 1885. 



Cereus mojavensis Engelmann and Bigelow, Proc. 



Amer. Acad. 3: 281. 1856. 



Cereus biselovii Engelmann, Pac. R. Rep. 4: pi. 4, _ , . 



f 8 TSsfi Fig. 4. Echtnocereus mojavensis. 



Cespitose, growing in massive clumps, often forming mounds, with hundreds of stems 

 (500 to 800 have been recorded) ; stems globose to oblong, 5 to 20 cm. long, pale green; ribs 8 to 13, 

 5 to 6 mm. high, but becoming indistinct on old parts of stem, somewhat undulate; areoles circular, 

 about 1 cm. apart; spines all white, or in age gray; radial spines about 10, acicular, spreading, 

 curved, 1 to 2.5 cm. long; central spine subulate, porrect or somewhat spreading, often weak, 3 to 5 

 cm. long; flowers rather narrow, 5 to 7 cm. long, crimson; perianth-segments broad, obtuse or even 

 refuse: areoles on ovary with white felt and short acicular spines; fruit oblong, 2.5 to 3 cm. long. 



Type locality: On the Mojave River in California. 



Distribution: Southeastern California to Nevada and Utah, western Arizona, and 

 reported from northwestern Mexico. 



* This species was named for the Mojave Desert, California, where it was first found. The specific name is 

 sometimes incorrectly spelled mohavensis. Munz and Johnston report that the flowers are "pale scarlet tinged with 

 nopal-red." 



