. Carnegie Institution of Washington publication. OPUNTIA. ed. 2. f. 130; Knippel, Kakteen 2: pi. 28, these three as Opuntia polyantha; Curtis's Bot. Mag. 53: pi. 2691, as Caclus polyanthos; De Candolle, PI. Succ. Hist. 2: pi. 138^, as Cactus opuntia polyanthos; Descourtilz, Fl. Med. Antil. pi. 513, as Cactus opuntia. Figure 141 is from a photograph of a plant collected by William Harris, near Kingston, Jamaica, in 1913; figure 142 represents a joint of the same plant. 102a. Opuntia pennellii sp. nov. (See Appendix, p. 219.) 103. Opuntia antillana Britton and Rose, Brooklyn Bot. Card. Mem. 1:
. Carnegie Institution of Washington publication. OPUNTIA. ed. 2. f. 130; Knippel, Kakteen 2: pi. 28, these three as Opuntia polyantha; Curtis's Bot. Mag. 53: pi. 2691, as Caclus polyanthos; De Candolle, PI. Succ. Hist. 2: pi. 138^, as Cactus opuntia polyanthos; Descourtilz, Fl. Med. Antil. pi. 513, as Cactus opuntia. Figure 141 is from a photograph of a plant collected by William Harris, near Kingston, Jamaica, in 1913; figure 142 represents a joint of the same plant. 102a. Opuntia pennellii sp. nov. (See Appendix, p. 219.) 103. Opuntia antillana Britton and Rose, Brooklyn Bot. Card. Mem. 1: 74. 1918. Growing in dense clumps, often i meter broad, more or less prostrate; joints usually obovate, 7 to 20 cm. long, narrow and nearly terete at base; terminal joints easily breaking off; leaves conic- subulate, about 2 mm. long; areoles large, 2 to 3 cm. apart, containing soft brown wool; spines stout, terete, 3 to 6 at an areole, unequal, i to 6 cm. long, yellow but becoming gray to nearly white in age; glochids numerous, yellow; flowers 5 to 7 cm. long; petals broad, obtuse, yellow, turning reddish in age; fruit reddish purple, 4 cm. FIG. 143.—Opuntia antillana forming thickets. Type locality: Near Basse Terre, St. Christopher, Rose, Fitch and Russell, No. 3230. February 2, 1913. Distribution: St. Christopher, St. Croix, Tortola, St. Thomas, Porto Rico, and Hispaniola. This species is one of the most widely distributed in the West Indies and, on some of the islands on which it occurs, generally the most abundant. This is partly due to the fact that the terminal joints are easily de- tached and may thus be widely scattered. The question has frequently been raised in our minds whether this species may not be of hybrid origin. It has some resemblance to O. dillenii, but has much smaller joints and these very fragile. What the other parent would be is not so clear. The fragile joints would suggest 0. triacantha or 0. repens, but otherwise there is no close alliance
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