ECHINOCEREUS. 



15 



This species passes generally as E. polyacanthus Engelmann, a Mexican species with 

 which it was confused in the Report on the Cactaceae of the Mexican Boundary, but as 

 stated by Mr. Standley that species "is amply separated by the presence of long, white 

 wool in the areoles of the ovary and fruit." 



Illustrations: Cact. Mex. Bound, pi. 54, 55, as Cercus polyacanthus. 



Figure 13 is from a photograph of a plant obtained on the Sierra Blanca, Texas, by 

 Rose, vStandley, and Russell in 1910, which afterward flowered in the cactus house of 

 the U. S. Department of Agriculture. 



Fig. 13. Echinocereus rosei. 



Fig. 14. Echinocereus maritimus. 



17. Echinocereus maritimus (Jones) Schumann, Gesamtb. Kakteen 273. 1898. 



Cereus maritimus Jones, Amer. Nat. 17: 973. 1S83. 



Cereus flaviflorus Engelmann in Coulter, Contr. U. S. Nat. Herb. 3: 391. 



Echinocereus flaviflorus Schumann, Gesamtb. Kakteen 274. 1898. 



1896. 



Decidedly cespitose, often forming clumps 60 to 90 cm. broad and 30 cm. high, sometimes con- 

 taining 200 joints; individual joints globose to short-cylindric, 5 to 16 cm. long; ribs 8 to 10; areoles 

 10 to 12 mm. apart; radial spines about 10, spreading; central spines 4, stout and angled, 2.5 to 3.5 

 cm. long; flowers small, including the ovary 3 to 4 cm. long, arising from near the top of the plant, 

 light yellow; inner perianth-segments oblanceolate, rounded at apex; ovary not very spiny; fruit 

 not seen. 



Type locality: Ensenada, Lower California. 



Distribution: West coast of Lower California. 



This is a low, coastal species, perhaps extending all along the west coast of central 

 Lower California. It was first found by Marcus E- Jones at Ensenada and was recently 

 collected at the same locality by Ivan M. Johnston, April 7, 1921 (No. 3007). Dr. Rose 

 found it in abundance about San Bartolome Bay and introduced a great quantity into culti- 

 vation. It has frequently flowered both in the New York Botanical Garden and at Wash- 

 ington. A specimen of the original collection is preserved in the U. S. National Museum. 



The name Cercus glomcratus Engelmann, unpublished, is cited by Orcutt (West 

 Amer. Sci. 13: 28. 1902) as a synonym of Echinocereus maritimus. The name is also used 

 by Schumann (Gesamtb. Kakteen 274. 1898), but it is not found in any of Engelmann's 

 works. 



Plants collected by Mr. C. R. Orcutt in Lower California have been referred as Echino- 

 cereus orcuttii (Kew Bull. Misc. Inf. 192 1: 36), without description. 



Illustration: Cact. Journ. 2: 123. 



Plate 11, figure 5, shows a plant in flower. Figure 14 is from a photograph of a plant 

 of the same collection brought to Washington from San Bartolome Bay, Lower California, 

 in 1911 by Dr. Rose (No. 16189). 



