. The Cactaceae : descriptions and illustrations of plants of the cactus family. 58 THE CACTACEAE. typical species of the so-called Mammillaria in its large flowers and black seeds, while from all of these genera it differs in its circumscissile fruit. This monotypic genus is named for Dr. Paul Bartsch, curator in the United States National Museum, distinguished in conchology, who has sent us cacti from many out of the way places. 1. Bartschella schumannii (Hildmann). Mammillaria schumannii Hildmann, Monatsschr. Kakteenk. i: 125. 1891. Mammillaria venusla K. Brandegee, Zoe 5: 8. 1900. More or
. The Cactaceae : descriptions and illustrations of plants of the cactus family. 58 THE CACTACEAE. typical species of the so-called Mammillaria in its large flowers and black seeds, while from all of these genera it differs in its circumscissile fruit. This monotypic genus is named for Dr. Paul Bartsch, curator in the United States National Museum, distinguished in conchology, who has sent us cacti from many out of the way places. 1. Bartschella schumannii (Hildmann). Mammillaria schumannii Hildmann, Monatsschr. Kakteenk. i: 125. 1891. Mammillaria venusla K. Brandegee, Zoe 5: 8. 1900. More or less cespitose (as many as 40 stems have been reported in a single cluster), 6 cm. high or less; axils slightly woolly, without bristles; radial spines 9 to 15, stout, 6 to 12 mm. long, brownish above, glabrous; central spines usually i, sometimes 2 or 3, one of these usually hooked; in seedlings 10 or II radial spines developing, these spreading, feather-like with long spreading hairs; in one-year- old plants the spines simply puberulent, all white with brown tips and one central much longer than the others and strongly hooked; flower 3 to 4 cm. in diameter, the segments about 10, lanceolate, acuminate; stamens numerous, erect, shorter than the style; style slender, erect, pale; stigma- lobes 6, linear, green; fruit short, dull in color; seeds usually found in a cup between the tubercles, less than i mm. Fig. 55.—Bartschella schumannii. Fig. 56.—Pelecyphora aselliformis. Type locality: Not cited.* Distribution: Southern Lower California. This species has been rare in collections, but considerable material was collected by Dr. Rose at Cape San Lucas, Lower California, in March 1911 (No. 16375). Living specimens were sent us from Lower California by Ivan M. Johnston in 1921. Dr. C. H. Thompson writes under date of September 15, 1911, as follows: "Your No. 16375, Mammillaria venusla, puzzles me. We received three plants from the New York Botanical Garden. Two are
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Keywords: ., bookauthorbrittonnathaniellord1, bookcentury1900, bookdecade1910
