1008 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



128. Neomammillaria bombycina (Quehl) Britt. & Rose, Cactaceae 4: 161. 

 1923. 



MammiUaria homhijcina Quehl, Monatsschr. Kakteenk. 20: 149. 1910. 



Mexico, the range not known. 



Cylindric, 15 to 20 cm. long, 5 to 6 cm. in diameter ; tubercles spiraled, 

 obtuse ; young areoles conspicuously white-woolly ; radial spines numerous, 

 acicular, widely spreading, 1 cm. long or less ; central spines 4, elongate, a 

 little spreading, those toward the top of plant erect, 2 cm. long, brown 

 except at base, the lower one hooked ; flowers from near the top, light purple, 

 about 1 cm. long; perianth segments narrowly oblong. 



129. Neomammillaria occidentalis Britt. & Rose, Cactaceae 4: 161. 1923. 

 Type from Manzanillo, Colima. 



Cespitose, the branches slender, cylindric, 10 cm. h'gh, densely spiny; radial 

 spinel about 12, yellowish, spreading ; central spines 4 or 5, reddish or brown, 

 one of them longer and hooked ; flowers 1 cm. long, pink ; fruit said to be red. 



130. Neomammillaria nelsonii Britt. & Rose, Cactaceae 4: 163. 1923. 

 Type from cliffs at La Solada, Michoacdn. 



Globo.se, 5 cm. in diameter ; tubercles numerous, terete, apparently not 

 milky, 5 to 7 mm. long, their axils naked ; radial spines about 15, acicular, 

 white, 6 to 8 mm. long, spreading; central spines several, all like the radials 

 but one of them elongate, stouter, and longer than the others, brown to 

 black, strongly hooked, 12 to 15 ram. long; fruit very slender, clavate, 3 cm. 

 long or more, red, few-seeded ; seeds globose, black, rugose, 2 mm. in diameter. 



131. Neomammillaria long-iflora Britt. & Rose, Cactaceae 4: 163. 1923. 

 Durango ; type from Santiago Papasquiaro. 



Solitary or clustered, 3 cm. in diameter, apparently not at all milky ; tu- 

 bercles terete, not grooved on upper side, 5 to 7 mm. long, rather closely set 

 and nearly hidden by the spines ; radial spines about 30, acicular, 10 to 13 

 mm. long, yellow or straw-colored, somewhat spreading; central spines 4, red- 

 dish brown, much stouter than the radials, 3 of them straight, about the length 

 of the radials, 1 of them hooked at apex, twice as long as the others ; flowers 

 several, even on small plants, borne near the top, 2 cm. long or more, with a 

 distinct narrow tube ; perianth segments pinkish, oblong, acute ; ovary very 

 small, ovoid, more or less sunken in the axils, thin above and perhaps dehiscing 

 by an operculum, the lower part with the seeds persisting for years ; seeds 

 nearly globose, minutely pitted, 1 to 1.5 mm. in diameter, black. 



132. Neomammillaria tacubayensis (Fedde) Britt. & Rose, Cactaceae 4: 164. 

 1923. 



MammiUaria tacubayensis Fedde, Nov. Gen. Sp. Ind. 1905. 443. 1905. 

 Type from Tacubaya, Distrito Federal. 



Globose, 3 to 5 cm. in diameter; radial spines 35 to 40, white, 3 to 5 mm. 

 long ; central spine 1, black, 5 to 6 mm. long, hooked ; flowers 1.5 cm. long. 



133. Neomammillaria umbrina (Ehrenb.) Britt. & Rose, Cactaceae 4: 164. 

 1923. 



MammiUaria umbriiia Ehrenb. Allg. Gartenz. 17: 287. 1849. 



Hidalgo. 



Simple or becoming cespitose, cylindric, 10 to 12.5 cm. high, dull green ; 

 tubercles conic; axils of tubercles naked; radial spines 22 to 25, spreading, 

 white, 4 to 6 mm. long; central spines 4, 3 being 8 to 10 mm. long, one being 

 20 to 24 mm. long, hooked ; flowers 2 cm. long ; inner perianth segments about 

 15, narrowly lanceolate, acute, purple. 



