. Carnegie Institution of Washington publication. 184 THE CACTACEAE. 4 to 6 (in the original description 8 to 10), somewhat spreading or appressed, i to 2 cm. long; glochids few, brownish; areoles small, cm. apart; leaves small, brownish; flowers red; fruit globular, yellowish, its areoles filled with long, weak glochids; umbilicus broad, only slightly depressed. Type locality: In Mexico. Distribution: Oaxaca, Mexico. This species is very near Opuntia streptacantha, and in many cases it is difficult to separate them. It is also near O. pilifera, but the areoles are not so hairy. Weber, who
. Carnegie Institution of Washington publication. 184 THE CACTACEAE. 4 to 6 (in the original description 8 to 10), somewhat spreading or appressed, i to 2 cm. long; glochids few, brownish; areoles small, cm. apart; leaves small, brownish; flowers red; fruit globular, yellowish, its areoles filled with long, weak glochids; umbilicus broad, only slightly depressed. Type locality: In Mexico. Distribution: Oaxaca, Mexico. This species is very near Opuntia streptacantha, and in many cases it is difficult to separate them. It is also near O. pilifera, but the areoles are not so hairy. Weber, who first described it, gives no definite locality for the species; but Dr. Rose has examined, at La Mortola, Italy, a living plant sent by Weber which seems to be the same as one of the large opuntias from Tehuacan, Mexico. Opuntia chavcna Griffiths (Rep. Mo. Bot. Card. 19: 264. pi. 23, in part. 1908) is a near relative of 0. hyptiacantha or not dis- tinct from it. Illustration: Rep. Mo. Bot. Card. 21: pi. 24, as Opuntia nignta. Figure 224 represents a joint of a plant obtained for the New York Botanical Garden from the collection of M. Simon, St. Ouen, Paris, France, in 1901. 204. Opuntia streptacantha Lemaire, Cact. Gen. Nov. Sp. 62. 1839. Much branched, up to 5 meters high, sometimes with a trunk 45 cm. in diameter; joints obovate to orbicular, 25 to 30 cm. long,dark green; areoles small, rather close together for this group; spines numerous, spreading or some of them appressed, white; glochids reddish brown, very short; flowers 7 to 9 cm. broad, yellow to orange, the sepals red- dish; filaments greenish or reddish; stigma-lobes 8 to 12, green; fruit globular, 5 cm. in diameter, dull red or sometimes yellow, both within and without. Type locality: Not cited. Distribution: Very common on the Mex- ican table-lands, especially on the deserts of San Luis Potosi. This species is known as tuna cardona or nopal cardon, and is one of the most impor- tant economic opuntias in Mexico. I
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