NEOMAMMILLARI A . 



129 



Distribution: Western Texas and northern Chihuahua. Reported also from Arizona, 

 but doubtless incorrectly. 



We have seen no specimens of A^. lasiacantha, except the type, but the following species, 

 first described as a variety of lasiacantha, is very common in eastern Texas and northern 

 Mexico. Possibly the two should be united, the typical form simply representing a juvenile 

 phase. 



Illustrations: Cact. Mex. Bound, pi. 3; Schumann, Gesamtb. Kakteen 522. f. 86; 

 Engler and Prantl, Pflanzenfam. 3^": f. 56, A; Blanc, Cacti 70. No. 1335; West Amer. Sci. 

 13 • 39> as Mammillaria lasiacantha. 



88. Neomammillaria denudata (Engelmann). 



Mammillaria lasiacantha denudata Engelmann, Cact. Mex. Bound. 5. 1859. 

 Cactus lasiacanthus denudatus Coulter, Contr. U. S. Nat. Herb. 3: 100. 1,394. 

 Mammillaria lasiandra denudata Quehl, Monatsschr. Kakteenk. 19: 79. 1909. 



Globose, 2.5 to 3.5 cm. in diameter; tubercles 5 to 6 mm. long; spines 50 to 80, glabrous or nearly 

 so, 3 to 5 mm. long, the innermost usually much shorter; flowers and fruit from near the center but 

 not from the axils of young tubercles; flowers 10 to 12 mm. long; perianth-segments few, about 12, 

 oblong, obtuse, the margins white, the center light purple; stamens white; style and stigma-lobes 

 green; fruit clavate, red, 1.5 to 2 cm. long; seeds black with basal hilum 



Fig. 139. — Neomammil!aria denudata. 



Fig. 140. — Neomammillaria lenta. 



Type locality: Western Texas. 



Distribution: Western Texas and northern Coahuila, Mexico. 



The flowers open about mid-day and close at night ; in one case which we recorded the 

 flowers opened for six consecutive days. 



Mammillaria rungii (Schumann, Gesamtb: Kakteen 522. 1898), an unpublished gar- 

 den name, was supposed by Schumann to be referable to M. lasiacantha denudata. 



Illustrations: Cact. Mex. Bound, pi. 4; Mollers Deutsche Gart. Zeit. 25: 475. f. 8, 

 No. 21, as Mammillaria lasiacantha denudata. 



Figure 139 is from a photograph of a plant collected by Elmer Steams in 1909, which 

 afterwards flowered in Washington. 



89. Neomammillaria lenta (K. Brandegee). 



Mammillaria lenta K. Brandegee, Zoe 5: 194. 1904. 



Described as cespitose; individuals globose to short-cylindric, almost hidden by the white 

 delicate spines; tubercles very slender, light green; spine-areoles naked ; spines about 40, very fragile; 

 axils woolly and occasionally bearing a single bristle; flowers whitish, 7 mm. long; perianth-segments 

 pointed; fruit red, clavate; seeds i mm. in diameter, dull black. 



