. Carnegie Institution of Washington publication. 162 THE CACTACEAE. Australia. J. H. Maiden says: "The growth of this Opuntia is one of the wonders of the world, and the spread of few plants in any country can be compared with ; Illustrations: Dept. Agr. N. S. W. Misc. Publ. 253: pi. [5]; Card. Chron. III. 34: f. 32; Gartenflora 31: pi. 1082, f. d, e, f; De Candolle, PI. Succ. Hist. 2: pi. 138 [C]; De Tussac, Fl. Antill. 2: pi. 34, the last two as Cactus opuntia inermis; Agr. Gaz. N. S. W. 23: pi. opp. 713; pi. opp. 714; pi. opp. 716; Bliihende Kakteen 2: pi. 108, all these as Op
. Carnegie Institution of Washington publication. 162 THE CACTACEAE. Australia. J. H. Maiden says: "The growth of this Opuntia is one of the wonders of the world, and the spread of few plants in any country can be compared with ; Illustrations: Dept. Agr. N. S. W. Misc. Publ. 253: pi. [5]; Card. Chron. III. 34: f. 32; Gartenflora 31: pi. 1082, f. d, e, f; De Candolle, PI. Succ. Hist. 2: pi. 138 [C]; De Tussac, Fl. Antill. 2: pi. 34, the last two as Cactus opuntia inermis; Agr. Gaz. N. S. W. 23: pi. opp. 713; pi. opp. 714; pi. opp. 716; Bliihende Kakteen 2: pi. 108, all these as Opuntia inermis. Plate xxvn, figure 4, represents a flowering joint of the plant collected by Dr. Brit- ton and John F. Cowell on limestone rocks near Pinar del Rio, Cuba, in 1911. 173a. Opuntia keyensis Britton. (See Appendix, p. 222.) 174. Opuntia dillenii (Ker-Gawler) Haworth, Suppl. PL Succ. 79. 1819. Cactus dillenii Ker-Gawler, Edwards's Bot. Reg. 3: pi. 255. 1818. Opittitia liorrida Salm-Dyck in De Candolle, Prodr. 3: 472. 1828. Opuntia maritime Rafinesque, Atl. Journ. 146. 1832. Opuntia tnnoidea Gibbes, Proc. Elliott Soc. Nat. Hist, i: 272. FIG. 201.—Opuntia dillenii, Antigua. West Indies. Low, spreading bushes growing in broad clumps and often forming dense thickets, or tall and much branched, 2 to 3 meters high, sometimes with definite terete trunks; joints obovate to oblong, 7 to 40 cm. long, the margin more or less undulate, bluish green, somewhat glaucous, but bright green when young, the areoles somewhat elevated; leaves subulate, curved backward, 5 mm. long; areoles often large, filled with short brown or white wool when young, usually few and remote, on old joints 10 to 12 mm. in diameter; spines often 10 from an areole on first-year joints, very variable, usually more or less flattened and curved, sometimes terete and straight, yellow, more or less brown- banded, or mottled, often brownish in age, sometimes 7 cm. long, but usually shorter, sometimes few o
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