18. Neomammillaria 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, densely white-woolly but in age glabrate; spines 4 to 6, very unequal, 5 to 8 mm. long, whitish or sometimes brownish, the central spine solitary; flowers 1.5 to
about 2 cm. long, deep carmine; perianth-segments oblong, apiculate, the tip dry, the outer ciliate, the inner serrulate; stamens and style purplish above; stigma-lobes 4, purple, short; fruit carmine;
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 grows among rocks in rich humus of the decaying leaves in half shade or in the sun. It is very 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 writes that this species is common in many of the barrancas of vera Cruz and that it is very variable. When first described two forms (brevispina and longispina) were characterized.
The species was named for Florantino Sartorius (1837-1908) who assisted Dr. Purpus for many years 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. Bot. 4 123) states that his herbarium was left to the Smithsonian Institution, but no record of this gift can now be found nor can any of his plants be found in the U. S. National Herbarium.
Here may or may not belong Mammillaria rebsamiana (Cact. Journ. 2 176), advertised as a new discovery by Louis Murillo, who lived at Jalapa, Mexico.
Semi Mesa-Garden - MG 882
Collezione "Ento"Ennio Toso - Savona
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