ECHINOCEREUS. 



41 



-Kcli 



reus si raumieus. 



Figure 5 1 is from a photograph of a plant 

 collected by Dr. Rose on the Sierra Blanca, 

 Texas, in 191 3; figure 52 shows a flower and 

 figure 53 a fruit copied from the above cited 

 illustrations in the Cactaceae of the Mexican 

 Boundary Survey. 



57. Echinocereus barthelowanus sp. nov. 



Plants cespitose, forming large clusters; stems 

 cylindric, 1 to 2 dm. long, 4 to 5 em. in diameter; 

 ribs about 10, somewhat tuberculate below, but 

 completely hidden by the stout numerous spines ; 

 areoles approximate, 2 to 5 mm. apart, white- 

 felted when young; spines numerous, acicular, 

 sometimes 7 cm. long, pinkish when quite young, 

 afterward white or yellow with brown or blackish 

 tips, in age becoming gray; flowers only 10 to 12 

 mm. long; perianth-segments oblong, 3 to 4 mm. 

 long, ovary minute, strongly tubercled, hidden 

 under the mass of spines ; spine-clusters on ovary 

 with 6 to 12 white or pinkish tipped spines, half as long as the flower. 



Collected by J. N. Rose on the mesa, near Santa Maria Bay, Lower California, 

 March 18, 191 1 (No. 16278). Here we would refer also plants collected by C. R. Orcutt 

 near the same locality in 19 17. 



The species is named for Captain Benjamin Barthelow, in whose company Dr. Rose 

 collected the plant while making a cruise in the Lower California waters on the U. S. 

 Steamer Albatross in 191 1. 



58. Echinocereus mamillatus (Engelmann). 



Cereus mamillatus Engelmann in Coulter, 

 Contr. U. S. Nat. Herb. 3: 405. 1896. 



Cespitose ; stems ascending, 2 to 3 dm. long, 

 cylindric, 3.5 to 6 cm. in diameter; ribs 20 to 25, 

 sometimes oblique, strongly tuberculate; spines 

 white or pinkish; radial spines 10 to 25, acicular, 

 3 to 12 mm. long; central spines 3 or 4, much 

 stouter than the radials, 1 to 2.5 cm. long; flowers 

 and fruit unknown. 



Figs. 52 and 53. Flower and fruit of Echinocereus 

 stramineus. X0.25. 



Type locality: Mountain sides south of Mulege, Lower California. 

 Distribution: Southern Lower California. 



Illustration: Schelle, Handb. Kakteenk. 97. f. 36, as Cereus mamillatus. 

 Figure 54 is from a photograph of a plant sent to the New York Botanical Garden 

 from the Missouri Botanical Garden, in 1904. 



59. Echinocereus ehrenbergii (Pfeiffer) Riimpler in Forster, Handb. Cact. ed. 2. 775. 1885. 

 Cereus ehrenbergii Pfeiffer, Allg. Gartenz. 8: 282. 1840. 

 Cespitose, 2 dm. high; joints often procumbent, pale or leaf-green; ribs 6, obtuse, sinuate, 

 areoles remote, 2 cm. apart, white-felted; radial spines 8 to 10, slender, white; central spines 3 or 4, 

 yellowish at base; flowers not known. 



Type locality: Not cited. 

 Distribution: Central Mexico. 



A living plant was obtained for the New York Botanical Garden from M. Simon of St. 

 Ouen, Paris, in 1901, but it died before flowering. 







