. The Cactaceae : descriptions and illustrations of plants of the cactus family. 82 THE CACTACEAE. 18. Neomammillaxia sartorii (J. A. Purpus). Mammillaria sartorii J. A. Purpus, Monatsschr. Kakteenk. 21: 50. 1911. Globose to short-cylindric, 5 to 13 cm. in diameter, cespitose, very milky, bluish green; tubercles strongly 4-angled, pointed, 8 to 12 mm. long, their axils without bristles and in time without wool; spine-areoles circular when young, densel}' white-wooU}^ but in age glabrate; spines 4 to 6, verj^ unequal, 5 to 8 mm. long, whitish or sometimes brownish, the central spine solitary; f
. The Cactaceae : descriptions and illustrations of plants of the cactus family. 82 THE CACTACEAE. 18. Neomammillaxia sartorii (J. A. Purpus). Mammillaria sartorii J. A. Purpus, Monatsschr. Kakteenk. 21: 50. 1911. Globose to short-cylindric, 5 to 13 cm. in diameter, cespitose, very milky, bluish green; tubercles strongly 4-angled, pointed, 8 to 12 mm. long, their axils without bristles and in time without wool; spine-areoles circular when young, densel}' white-wooU}^ but in age glabrate; spines 4 to 6, verj^ unequal, 5 to 8 mm. long, whitish or sometimes brownish, the central spine solitary; flowers i .5 to about 2 cm. long, deep carmine; perianth-segments oblong, apiculate, the tip dry, the outer ciliate, the inner serrulate; stamens and stjde purplish above; stigma-lobes 4, purple, short; fruit carmine; seeds brown. Type locality: Barranca de Panoaya, Vera Cruz, Mexico. Distribution: Mountains of Vera Cruz, 300 to 600 meters altitude. Our description of this interesting and variable little plant is drawn from specimens sent to us by Dr. C. A. Purpus in 1920, collected at the type locality. There the plant. âXeomammillaria melanocentra. -Neomammillaria seitziana. grows among rocks in rich humus of the deca}'ing leaves in half shade or in the sun. It is ver}^ different from any other Neomammillaria which we have seen; the tubercles are copiously milky and the slightest bruise causes the white milk to ooze out. It flowered in Washington in April 1923. Dr. C. A. Purpus â writes that this species is common in many of the barrancas of Vera Cruz and that it is ver\^ variable. When first described two forms {hreinspina and longi- spina) were characterized. The species was named for Florantino Sartorius (183 7-1908) who assisted Dr. Purpus for many A^ears in his botanical expeditions. He was a son of Carlos Sartorius (1795- 1872), a distinguished scientist who went to Mexico about 1825, where he made large collections of plants. Mr. W. Botting Hemsley (Biol. Centr. Amer.
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