144 



THE cactaceae;. 



111. Neomammillaria seideliana (Quehl). 



Manimillaria seideliana Quehl, Monatsschr. Kakteenk. 21: 154. 191 1. 

 Solitary, globose, becoming cespitose, 3 to 4 cm. in diameter; tubercles purplish, their axils 

 naked; radial spines 20 to 25, white, long and slender, ascending, puberulent; central spines yellow, 

 3 or 4, puberulent when young, one hooked; flowers arising from near top of plant, about 15 to 18 

 mm. long, creamy yellow; outer perianth-segments brownish; inner perianth-segments oblong, 

 acute; style cream-colored, much longer than stamens; stigma-lobes 5 or 6, cream-colored, obtuse; 

 fruit persisting in axils of tubercles, apparently for a number of years ; seeds black, with thick neck 

 at base; the hilum basal, large. 



Type locality: Zacatecas, Mexico. 



Distribution: Known only from the state of Zacatecas. 



Collected by F. E- Lloyd in Zacatecas, Mexico, in 1908 (No. 54), who states that he 

 found but a single specimen, though he made diligent search for others. 



Although the flowers appear to come from near the top of the plant they are all from 

 axils of old tubercles. In the single specimen examined the flowers appeared before the 

 plant began to form new tubercles. In Mammillaria barbata, a closely related species, the 

 flowers occur at both the old and new tubercles, but so far as known no other species 

 possesses that character, although there is no good reason for not finding it in closely related 

 species. 



Figs. 157a and 158. — Neomammillaria seideliana. 



We have also had a plant sent us by Haage and Schmidt ; it is a profuse bloomer. 

 Illustration: Monatsschr. Kakteenk. 21: 155, as Mammillaria seideliana. 

 Figure 157a is from a photograph of a plant sent us from Zacatecas, Mexico, by Pro- 

 lessor Lloyd in 1908; figure 158 is from a photograph sent by L. Quehl. 



112. Neomammillaria barbata (Engelmann). 



Mammillaria barbata Engelmann in Wislizenus, Mem. Tour North. Mex. 105. 1848. 

 Cactus barbatus Kuntze, Rev. Gen. PI. i: 260. 1891. 



Often densely cespitose, globose, 3 to 4 cm. in diameter; radial spines 20 or more, acicular, 

 spreading or ascending, white, sometimes with brown tips ; central spines several, subulate, brown, 

 puberulent, i or 2 hooked; flowers 15 mm. long; outer perianth-segments ovate to lanceolate, 

 ciliate; inner perianth-segments erect or spreading at tip, light straw-colored or greenish, brown 

 without, acute; filaments numerous, short, purplish; stigma-lobes 5 to 7, greenish. 



Type locality: Cosihuirachi, Mexico. 



Distribution: Western Chihuahua, Mexico. 



This species was collected by Dr. Wislizenus in 1846 and rediscovered and collected 

 at the type locality in 1908 by Dr. Rose, and upon this latter collection the above descrip- 

 tion is based. Schumaim did not recognize the species, but thought that it might be near 

 Mammillaria grahamii. 



Illustrations: Cact. Mex. Bound, pi. 6, f. 9 to 12; Monatsschr. Kakteenk. 20: 181; 

 Gartenflora 34: pi. 1208, f. a, b, c; 43: pi. 1400, as Mammillaria barbata. 



