i8 



THE CACTACEAE. 



Inst. 1908: pi. 14, f. i; Thomas, Zimmerkultur Kakteen 46, as Mammillaria conoidea; 

 Monatsschr. Kakteenk. 6: 119, as Mam)uiUaria grandiflora. 



Figure 15 is from a photograph of a barren plant collected by Dr. Safford in Mexico 

 in 1907 (No. 1334); figure 17 is from a photograph of a flowering plant collected by Dr. 

 Chaffey in the state of Zacatecas, Mexico, July 4, 191G. 



Related to the preceding is: 



Mammillaria crebrispina De CandoUe, Mem. Mus. Hist. Nat. Paris 17: 11 1. 1828. 

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



This plant was collected by Thomas Coulter but its identification is very uncertain. 

 Pfeiff'er thought that it was related to Ulaimnillaria conoidea and perhaps it should be 

 referred there. 



IMammillaria polychlora Scheidweiler (Forster, Handb. Cact. 205. 1S46) was given as 

 a synon^^m of j\I. crebrispina. 



Fig. 18. — Neolloydia texensis. 



7. Neolloydia texensis sp. nov 



Globular to short-oblong, 4 to 6 cm. long; tubercles arranged in long spirals, somewhat imbri- 

 cated, a little flattened dorsalh'; radial spines 10 to 15, white, widety spreading, about i cm. long; 

 central spines i to 3, much stouter than the radials, elongated, 2 to 3 cm. long, black; flowers not 

 seen; fruit small, globular, almost hidden by the spines, greenish, thin-walled, dr\'; seeds black, 

 tuberculate, 1.5 mm. in diameter; hilum large, basal, white lunate. 



Collected by MacDougal and Shreve at Sanderson, Texas, December 1920. 



This seems to be the plant from Texas referred by Engelmann to Mammillaria scoly- 

 moides but it probably is not that species which came from central Alexico. il/. scolymoides 

 probably should be considered a synonj'm of Coryphantha cornifera, the species of which 

 Engelmann once thought that it might h& only a form. Coulter (Contr. U. S. Nat. Herb. 

 3: 115. 1894) treats the Texan plant under the name of Cactus scolymoides but the range 

 which he gives is too wide, and doubtless more than one species is involved, both in his 

 description and range. The only specimen which we have seen of this species, except 

 MacDougal and Shreve's plant, is one collected by Walter M. Evans in 1891, which is 

 mixed ^^4th Cactus echinus and labeled as from near El Paso, Texas. 



Figure 18 is from a photograph of plants collected by Dr. MacDougal and Dr. Shreve. 



