142 



THE CACTACEAE. 



lower one sometimes strongly hooked; flowers from axils of old tubercles, near top of plant; 1.5 cm. 

 long, deep purple; inner perianth-segments narrowly oblong, apiculate; filaments and style purplish; 

 stigma-lobes greenish; fruit clavate, red, 12 

 mm. long; seeds minute, brown. 



This species has been sent to us re- 

 peatedly from Oaxaca, Mexico, by Dr. 

 B. P. Reko and it has been named in his 

 honor; we have selected as the type his 

 specimen of 192 1, which flowered in 

 Washington. 



This is a remarkable species, being 

 the only one we know, except the follow- 

 ing, which has the characters of watery 

 tubercles, a hooked spine, and brown 

 seeds, but some plants give out a very 

 diluted milk and have no hooked spines. 



Dr. Reko sent us a single plant in 

 April 1922, which was about 12 cm. long 

 and short-clavate ; the central spines 

 were mostly 4, but sometimes 5, and 

 none of them hooked. In this specimen 

 we obtained a diluted milky juice from 

 the upper tubercles while the lower ones 

 are entirely devoid of milk. It flowered 

 in April 1923 and seemed to be referable 

 here. 



Figure 149 shows a plant sent by Dr. B. P. Reko from Oaxaca, Mexico, in 1919; figure 

 155a shows the plant collected by Dr. Reko in 1922, referred to above. 



Fig. 155a. — Neomammillaria rekoi. 



108. Neomammillaria solisii sp. nov. 



Simple, globular or nearly so, 5 to 7 cm. in diameter, green or becoming purplish; tubercles 8 

 mm. long, terete in section, a little narrow towards the tip and thus separated above from the ad- 

 joining tubercles, their axils without wool even when quite young, and usually with i to many 

 bristles; radial spines about 10 to 20, spreading, 6 to 7 mm. long, white, bristle-like; central spines 

 3 or 4, a little stouter than the radials, becoming brown, one of them strongly hooked (sometimes 

 2 cm. long). 



Collected by Octavio Soils in Cerro de Buenavista de Cuellar, Guerrero, Mexico, in 

 1920 (No. 5) and in 192 1, type, and at the same station by Professor C. Nuiiez in April 

 and November 192 1 (Nos. 4 and 6). 



Figure 156 is from a photograph of a plant sent by Octavio Soils from Guerrero, Mexico, 

 in 1920; figure 157 is from a photograph of a plant sent by Professor C. Nuiiez in 1922. 



109. Neomammillaria pygmaea sp. nov. 



Plant very small, globose to cylindric, 2 to 3 cm. in diameter; tubercles small, obtuse; radial 

 spines about 15, white, stiff, hardly puberulent even under a lens; central spines 4, ascending, 

 golden yellow, the lower one hooked, 5 to 6 mm. long; flowers about i cm. long, the outer segments 

 tinged with red, apiculate; inner perianth-segments about 10, cream-colored; filaments greenish, 

 much shorter than the perianth-segments; style greenish. 



Collected by J. N. Rose near Cadereyta, Queretaro, Mexico, in 1905 (No. 9863). 

 It has repeatedly flowered but was only 3 cm. high in 192 1 when it died. 



