CORYPHANTHA. 33 



Simple, subglobose, up to 14 cm. high and 19 cm. broad; tubercles very large, somewhat flat- 

 tened, obtuse, 4 to 5 cm. long, densely woolly in the axils; areoles elliptic, when young woolly, in 

 age naked; spines 8, all radial, somewhat unequal, subulate, the longest about 2 cm. long, spreading, 

 when young brownish with yellowish bases, black at apex ; flowers large, rose-colored, 1 1 cm. broad ; 

 perianth-segments numerous, narrowly oblong, apiculate. 



Type locality: Not cited. 



Distribution: Central Mexico, but Nicholson's Dictionary of Gardening says Paraguay 

 in error. 



This is a very characteristic plant but we know it only from illustrations. Walter 

 Mundt once offered it for sale but his supply has been exhausted ; he gives a good illustra- 

 tion of it in a group of cacti printed on his letter heads and he writes us that this plant 

 has a large carmine flower. 



Schelle (Handb. Kakteenk. 238. 1907) gives M. elephantidens spinosissima Rebut, with- 

 out synonymy or description. 



Illustrations: Diet. Gard. Nicholson 4: 563. f. 33; Suppl. 516. f. 550; Forster, Handb. 

 Cact. ed. 2. 397. f. 40; Hort. Univ. i: pi. 2i2i\ Pfeiffer, Abbild. Beschr. Cact. 2 pi. 20; Riim- 

 pler, Sukkulenten 206. f. 117; Garden i: 396; Lemaire, Icon. Cact. pi. 2 [not pi. 3]; Herb. 

 Gener. Amat. II. 2: pi. 17; Palmer. Cult. Cact. iii; Ann. Rep. Smiths. Inst. 1908: pi. 14, 

 f. 3; Goebel, Pflanz. Scbild. i: f. 34; Blanc, Cacti 68. No. 1224; Watson, Cact. Cult. 159. 

 f. 60; Bergen in Rother, Praktischer Leitfaden Kakteen 5 ed. i. 65; ed. 3. f. 38, as Mam- 

 millaria elephantidens. 



14. Coryphanthabtunamma (Ehrenberg). 



Mammillaria bumamma Ehrenberg, Allg. Gartenz. 17: 243. 1849. 

 g Mammillaria elephantidens bumamma Schurnann, Keys Monogr. Cact. 43. 1903. 



Globular or somewhat depressed ; tubercles few, very large, rounded at apex, bluish green, very 

 woolly in their axils when young but glabrate in age; spines 5 to 8, subulate, grayish brown, more or 

 less recurved, 2 cm. long or more, all radial; flower large, yellow, 5 to 6 cm. broad; inner perianth- 

 segments narrowly oblong, obtuse or retuse. 



Type locality: Mexico. 



Distribution : Mexico . 



This plant is perhaps nearest Coryphantha elephantidens, to which it was referred as a 

 variety, but the flowers are much smaller and nearly yellow. Mundt states that the 

 flowers are smaller but bright rose with a dark stripe. His plant, however, is not now in 

 his possession. 



The plants are often much depressed, arising only a little above the surface of the 

 ground, and are firmly anchored in the soil by a thick root, almost equal in diameter to that 

 of the stem itself. 



Dr. Rose made two collections in Mexico which we would refer here, one on the ped- 

 regal near Yautepec, Morelos (No. 8530), and the other at Iguala, Guerrero (No. 9320). 



Illustration: Engler and Prantl, Pflanzenfam. 3*"": 194. f. 67, as Mammillaria bumamma. 



Plate V, figure 6, shows a plant collected by H. H. Rusby at Lemon Mountain, Guer- 

 rero, altitude 800 meters, July 28, 1910 (No. 4), which flowered in the New York Botanical 

 Garden, September 11, 191 1. Figure 29 is from a photograph showing a top view of a 

 plant collected by Dr. C. Reiche at Iguala, Mexico, in 1921. 



15. Coryphantha robustispina (Schott). 



Mammillaria robustispina Schott in Engelmann, Proc. Amer. Acad. 3: 265. 1856. 

 Cactus robustispinus Kuntze, Rev. Gen. PI. i: 261. i8gi. 

 Mammillaria brownii Toumey, Bot. Gaz. 22: 253. 1896. 

 Cactus brownii Toumey, Bot. Gaz. 22: 253. 1896. 



Stems solitary or clustered, globular or a little longer than thick, 5 to 15 cm. high, densely 

 armed and almost hidden by the spines; tubercles large, 2.5 to 2.8 cm. long, arranged in 13 some- 

 what spiraled rows, fleshy, in age thickly set one against the other, becoming more or less dorsally 

 flattened, pale, grayish green, narrowly grooved; radial spines 12 to 15, the 3 lower very stout, brown- 



