. Carnegie Institution of Washington publication. THE CACTACEAE. Berger remarks that this species is very variable, but that it can not well be divided even into varieties. Opimtia mcgalarihra Rose (Smiths. Misc. Coll. 50: 529. 1908), in its very spiny joints, yellow spines, and small fruits, seems very different from the common cultivated 0. robusta; yet when grown in the greenhouse for several years it takes on much the appearance of 0. robusta. If this view is correct, O. megalarthra represents the wild form of the species. Opuntia cochinera Griffiths (Rep. Mo. Bot. Card. 19: 263. pi. 26. 1
. Carnegie Institution of Washington publication. THE CACTACEAE. Berger remarks that this species is very variable, but that it can not well be divided even into varieties. Opimtia mcgalarihra Rose (Smiths. Misc. Coll. 50: 529. 1908), in its very spiny joints, yellow spines, and small fruits, seems very different from the common cultivated 0. robusta; yet when grown in the greenhouse for several years it takes on much the appearance of 0. robusta. If this view is correct, O. megalarthra represents the wild form of the species. Opuntia cochinera Griffiths (Rep. Mo. Bot. Card. 19: 263. pi. 26. 1908) from Zacatecas, Mexico, is, perhaps, a hybrid between Opuntia robusta and one of the Streptacanthae. Illustrations: N. Mex. Agr. Exp. Sta. Bull. 60: pi. 5, f. i; Monatsschr. : 135; Journ. Inter. Card. Club 3: 14, the last two as Opuntia gorda; U. S. Dept. Agr. Bur. PI. Ind. Bull. 74: pi. 5, as Tapuna pear. ? N. Mex. Agr. Exp. Sta. Bull. 64: pi. i. Plate xxxiv, figure 4, represents a joint of the plant collected by Dr. Rose in Hidalgo, Mexico, in 1905, and described by him as Opuntia megalarthra. Figure 238 is from a photo- graph taken in Zacatecas, Mexico, by Professor F. E. Lloyd in 1908. .. ''' FIG. 238.—Opuntia robusta. 214. Opuntia guerrana Griffiths, Rep. Mo. Bot. Card. 19: 266. 1908. Plant 9 to 12 dm. high, with an open, branching top; joints oblong to orbicular, 15 to 25 cm. long, thick, glaucous; areoles 5 mm. in diameter, filled with tawny wool; spines white to yellow, i to 6, flattened, twisted; petals yellow; filaments greenish white; stigma-lobes green; fruit globose greenish white, 4 to 5 cm. in diameter. Type locality: Near Dublan, Hidalgo, Mexico. Distribution: Known only from type locality. Except in size and color of fruit this species is very much like the common Opuntia robusta of this part of Mexico. 215. Opuntia fusicaulis Griffiths, Rep. Mo. Bot. Gard. 19: 271. 1908. Plant 5 meters high or less, the branches erect or spreading; joints obl
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