

CATALOGUE OF SPECIES. 113 



Opuntia chlorotica Engelm. & Bigel. Pac. R. Eep. iv. 38 (1856). Type locality, 

 "on both sides of the Colorado, from the San Francisco mountains to the head- 

 waters [of] Williams' river, sometimes called 'Bill Williams' fork/ and to the 

 Mojavo creek." 



In the Charleston Mountains, Nevada, hoth near Clark's sawmill (No. 313) and on 

 the eastern slope of Mountain Springs Pass. 



Opuntia echinocarpa Engelm. & Bigel. Pac. R. Rep. iv. 49 (1856). Type local- 

 ity, "in the Colorado valley, near the mouth of Williams' river/' 



Nos. 1891 and 1993 are specimens whose lateral branches are shorter tban usual, 

 only 2 to 6 cm., their tubercles closer together, and the wbole plant, therefore, much 

 more compact and more densely covered with spines than in the typical form. Such 

 specimens wore found near Cottonwood Springs, Nevada (Xo. 1891), and farther 

 northeastward in Nevada (No. 1993) and Utah. Nos. 132 and 1960 represent the ordi- 

 nary form of the plant. 



This is the common cylindrical-stemmed Opuntia of tbo Mohave Desert region. 

 Throughout the Larrea belt northward from Hesperia (No. 132) it occurred almost 

 everywhere, yet it was not found, strange to say, in Death Valley itself nor in the 

 immediate vicinity. In Tehachapi Pass, Walker Pass, and Antelope Valley it ceases 

 abruptly with the desert vegetation, extending a little farther than Larrea, but not 

 farther than Yucca arborescens. 



Opuntia engelmanni occidentalls (Engelm. & Bigel.) Pac. R. Rep. iv. 38 (1856), 

 as 0. occidentalis; Engelm. Proc. Amer. Acad. iii. 291 (1856). Type locality, "on the 

 western slope of the California mountains, from Qniqual Gungo, east of Los Angeles, 

 to San Pasquale and San Isabel, northeast of San Diego, at an elevation of 1,000 to 

 2,000 feet." 



Near San Bernardino (No. 28). 



Opuntia missouriensis DC. Prodr. iii. 472 (1828). Typo locality, "in planitiebus 

 aridis ad Missouri." 



Reese River Valley (Xo. 161), Charleston Mountains (Xo. 314), and about 30 kilo- 

 meters east of Panaca (Xo. 1981), localities all in Nevada. The specimens are with- 

 out flowers. Xo. 1981 appears to be the same as No. 434 of the King Survey. Its 

 spines are much stouter, fewer, and of more uniform size than those of O. rutila. 

 Xos. 161 and 314 have larger, slenderer spines, more nearly like those of the short- 

 spined forms of O. rutila, while the smaller ones are appressed to the surface of the 

 joint, as iu O. missouriensis from the Rocky Mountain region, not divergent as in 

 (). rutila. The reference of these specimens to O, missouriensis is not entirely satis- 

 factory. 



Opuntia parryi Engelm. Amer. Journ. Sci. ser. 2. xiv. 339 (1852). Type locality, 

 "eastern slope of the California mountains, near San Felipe." 



In the report of the Whipple Expedition 1 Dr. Engelmann again described this spe- 

 cies from specimens collected by Bigelow on "gravelly plains 30 miles west of the 

 Colorado, near the Mohave River," with the remark : " This description refers to the 

 plant brought by the expedition 1'romMojave River. Several years before this time 

 Dr. Parry had described a plant discovered by him f on the hills and plains about 

 San Felipe, on the eastern slope of the California mountains,' which bad been named 

 after the discoverer, We presume that both plants were identical, but have to 

 remark that Dr. Parry's plant is much larger, having, joints of 4 to 8 inches in length, 

 with tubercles 6 to 12 lines long; spines whitish, half an inch long. He describes 

 the flower as 1^ inch in diameter, greenish-yellow, with <jreen stigmas. Fruit not 

 mentioned. Further investigation will be necessary to clear up these doubts." Our 

 plant agrees precisely with the figures and description of Bigelow's Mohave River 



'Pac. R. Rep. iv. 48 (1856). 



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