. Carnegie Institution of Washington publication. OPUNTIA. 145 back from the Southwest by W. H. Emory. They can never be critically identified, but are probably of this relationship. Illustrations: Engler and Prantl, Pflanzenfam. 36a: f. 57, C; Forster, Handb. Cact. ed. 2. f. 141; Illustr. Fl. 2: f. 2530; ed. 2. 2: f. 2989; Pac. R. Rep. 4: pi. 9, f. i to 5; pi. 22, f. 12 to 15; Wiener Illustr. Gartenz. 10: f. 115, all as Opuntia caiihiucliica; N. Mex. Agr. Exp. Sta. Bull. 78: pi. [7], as Opuntia chihuahuensis; Contr. U. S. Nat. Herb. 12: pi. 55, as Opuntia blakeana; Cact. Mex. Bound, pi. 75, f
. Carnegie Institution of Washington publication. OPUNTIA. 145 back from the Southwest by W. H. Emory. They can never be critically identified, but are probably of this relationship. Illustrations: Engler and Prantl, Pflanzenfam. 36a: f. 57, C; Forster, Handb. Cact. ed. 2. f. 141; Illustr. Fl. 2: f. 2530; ed. 2. 2: f. 2989; Pac. R. Rep. 4: pi. 9, f. i to 5; pi. 22, f. 12 to 15; Wiener Illustr. Gartenz. 10: f. 115, all as Opuntia caiihiucliica; N. Mex. Agr. Exp. Sta. Bull. 78: pi. [7], as Opuntia chihuahuensis; Contr. U. S. Nat. Herb. 12: pi. 55, as Opuntia blakeana; Cact. Mex. Bound, pi. 75, f. 9 to 13. Plate xxv, figure 2, represents a flowering joint of a plant sent from Tucson, Arizona, in 1916, by Dr. Mac- Dougal. 146. Opuntia mojavensis Engelmann, Proc. Amer. Acad. 3: 293. 1856. Prostrate, with suborbicular joints; pulvini remote, with large yellow bristles; spines 2 to 6, stout and annulate, acutely angu- lar and compressed, more or less curved, reddish brown, paler toward tip, to 6 cm. long, i to 3 smaller, slenderer, pale ones added below; fruit oblong, cm. long. of the Colorado,. FIG. 183.—Opuntia covillei. Xo-4- Type locality: On the Mojave, west California. Distribution: Known only from the type locality. The fragmentary type speci- men has been examined; we have been unable to refer any other specimens to this species, which is thus very imperfectly under- stood. Illustration: Pac. R. Rep. 4: pi. 9, f. 6 to 8. 147. Opuntia covillei Britton and Rose, Smiths. Misc. Coll. 50: 532. 1908. Opunlia megacarpa Griffiths. Rep. Mo. Bot. Card. 20: 91. 1909. Opuntia ntgosa Griffiths, Proc. Biol. Soc. Washington 27: 27. 1914. Bushy plants, usually growing in dense thickets; joints orbicular to obovate, 10 to 20 cm. long or more, pale green, sometimes purplish, slightly glaucous; areoles 2 to 4 cm. apart; spines several from an areole, slender, unequal, the longest ones 6 cm. long, white when young, brownish when old; flowers large, yellow. Type locality: San
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