8o 



THE CACTACEAE. 



in greenhouse specimens), porrect or more or less reflexed, reddish in age; flowers dark pink, a Httle 

 longer than the tubercles; perianth-segments linear, spreading; stigma-lobes 5 to 7, rose-colored. 



Type locality: Mexico. 



Distribution: San Luis Potosi. 



Our description is based on plants from San Luis Potosi, Mexico, especially those col- 

 lected by Mrs. Vera in 191 2. 



Schumann refers Mammillaria macracantha to M. ccntricirrha but it must be different. 

 Riimpler refers to it also M. zuccarinii, but this has different flowers and we have recog- 

 nized it as a species. M. macraniha (Forster, Handb. Cact. 189. 1894) is referred here. 



Illustrations: De CandoUe, Mem. Cact. pi. 9; Forster, Handb. Cact. ed. 2. 378. f. 38, 

 as Alanimillaria macracantha ; Schumann, Gesamtb. Kakteen f. 93; Thomas, Zimmerkultur 

 Kakteen 57; Mollers Deutsche Gart. Zeit. 25: 475. f. 8, No. 13, as M. centricirrha macra- 

 cantha; (?) Engler and Prantl, Pfianzenfam. 3'''': 170. f. 57, E, as M. centricirrha. 



Fig. 72a. — Neomamminaria macracantha. 



Plate IX, figure 4, shows a plant received from Kew in 1902, which flowered in the New 

 York Botanical Garden on April 27, 1912. Figure 72a is a reproduction of the first illus- 

 tration cited above; figure 72 is from a photograph of the plant distributed by the Kew 

 Gardens in 1902 which flowered in the New York Botanical Garden in 1905. 



15. Neomammillaria johnstonii sp. nov. ^ 



Plants large for the genus, globular to short-oblong, 15 to 20 cm. high, slightly depressed at 

 apex; tubercles i to 1.5 cm. long, 4-angled throughout, somewhat bluish, naked in their axils, milky; 

 spine-areoles when A^oung short-floccose, in age glabrate, circular; radial spines 10 to 14, white, but 

 with brown tips, somewhat spreading, stiff-acicular; central spines 2, much longer and stouter than 

 the radials, slightly diverging, bluish brown; flowers from near top of plant but from axils of old 

 tubercles, campanulate, 2 cm. long; outer perianth-segments ovate-lanceolate, greenish white with a 

 reddish-brown mid-rib ; inner perianth-segments narrow, acuminate, white ; filaments short, pinkish ; 

 style pinkish; stigma-lobes linear, 6 or 7, green. 



