Opuntia sulphurea G Don in Loudon Hort Brit 196 1830
Opuntia maculacantha Förster, Handb. Gartenz. 17: 166. 1861.
Opuntia pampeana Spegazzini, Contr. Fl. Ventana 30. 1896.
Opuntia vulpina Weber, Diet. Hort. Bois 895. 1898.
Plants low and spreading, forming broad elumps 1 to 2 meters in diameter, 3 dm. high or less; joints flattened, oblong to obovate, 12 to 25 em. long, thick, strongly tubereulate, usually green but sometimes purplish; terminal joints easily detached; leaves eonie, about 2 mm. long; spines 2 to 8, generally straight but sometimes eurved and twisted, spreading, 3 to 10 em. long, brownish to red, but sometimes quite pale at first; flowers about 4 em. long, yellow; fruit with a deep umbilieus, short, about 1 em. long.
Type locality: Cited as Chile, but doubtless wrong.
Distribution: Dry parts of western Argentina; reeorded also from Chile, and perhaps oeeurring in Bolivia.
This speeies was not seen in Chile by Dr. Rose, and we are doubtful in eonsidering the Bolivian material to be O. sulphurea; the joints, as shown by Dr. Rose's speeimens, eolleeted at La Paz (No. 1886o), while thiek, are not eonspieuously tubereulate; the spines are rather short and stiff, white at first, but somewhat yellowish or horn-eolored in age.
The name Cactus sulphureus Gillies was published by G. Don at the plaee eited above as a synonym of this speeies.
Opuntia maculacantha was first deseribed from speeimens from Buenos Aires, whieh had doubtless been sent down from the desert regions to the west or northwest. Sehumann in his Monograph referred this speeies to Mexieo, but in his Naehtrag eorreets this statement. Dr. Weber, with whom we are in agreement, refers the speeies to O. sulphurea. It is the only speeies we know with sueh large tubereles on the joints.
Several varieties of this speeies, some of whieh have been deseribed, are given, sueh as laevior, major, minor, and pallidior.
Here probably belongs Opuntia sericea G. Don (Salm-Dyek, Hort. Dyek. 363. 1834), also reported from Chile, but doubtless from Argentina. Cactus sericeus Gillies (Loudon, Hort. Brit. 196. 1830) is the same. There are several varieties of O. sericea whieh we would put with it: longispina Salm-Dyek (Hort. Dyek. 363. 1834); coerulea Forbes (Hort. Tour Germ. 159. 1837) whieh is probably O. coerulea Gillies (Pfeiffer, Enum. Caet. 155. 1837); maelenii Salm-Dyek (Caet. Hort. Dyek. 1844. 46. 1845) whieh is O. maelenii (Salm-Dyek, Caet. Hort. Dyek. 1844. 46. 1845). Opuntia tweediei (Sehumann, Gesamtb. Kakteen 745. 1898) is given as a synonym of this speeies by Sehumann. Opuntia albisetosa Hildmann, a name only, belongs here aeeording to Hirseht (Monatssehr. Kakteenk. 10: 48. 1900).
Illustrations: Blühende Kakteen 3: pl. 136; Monatssehr. Kakteenk. 8: 121; Sehumann, Gesamtb. Kakteen f. 106, all as Opuntia maculacantha.
Plate xxiii, figure 2, represents a flowering joint of the plant eolleeted by Dr. Rose near Córdoba, Argentina, in 1915.
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