94 The; cactacbab. 



Schumann refers here Mammillaria cirrhifera, but certainly Pfeiffer's illustration 

 (Abbild. Beschr. Cact. i : pi. 7) with its long, curved, radial spines and no centrals is very- 

 different; we have referred it to Neomammillaria magnimamma. 



Illustrations: Nov. Act. Nat. Cur. 16: pi. 21; MoUers Deutsche Gart. Zeit. 25: 475. 

 f. 8, No. 17, as Mammillaria mystax; MoUers Deutsche Gart. Zeit. 25: 475. f. 8, No. i; 

 Karsten and Schenck, Vegetationsbilder i: pi. 44; Schelle, Handb. Kakteenk. 272. f. 195, 

 as M. mutabilis; Schelle, Handb. Kakteenk. 273. f. 196, as M. mutabilis longispina. 



Plate IX, figure 5, shows a plant collected by Dr. Rose at Tehuacan which flowered and 

 fruited in Washington in 1907. Figure 89 is from a photograph of a potted plant obtained 

 by Dr. Rose at Tehuacan in 1905. 



36. Neomammillaria petterssonii (Hildmann). 



Mammillaria petterssonii Hildmann, Deutsche Garten-Zeitung 1886: 185. 1886. 

 Mammillaria heeseana McDowell, Monatsschr. Kakteenk. 6: 125. 1896. 



Plants rather large for this genus, cylindric, 2 dm. high or more, very spiny; tubercles arranged 

 in 13 or 21 spirals, terete, setose in their axils; radial spines 10 to 12, white, with black tips; central 

 spines 4, the longer ones 4.5 cm. long; flowers unknown; fruit small, naked, oblong. 



Type locality: Mexico. 



Distribution: Guanajuato, Mexico. 



We have followed Schumann in uniting Mammillaria petterssonii and M. heeseana but 

 have selected the older name. 



Dr. Rose collected this plant in Guanajuato in 1889 (No. 4846) and Dr. Safford obtained 

 it there a few years later. 



Mammillaria heeseana brevispina and M. heeseana longispina are two varieties listed by 

 Schelle. 



Illustrations: Ann. Rep. Smiths. Inst. 1908: pi. 7; Schelle, Handb. Kakteenk. 265. f. 

 188, as Mammillaria heeseana; Blanc, Cacti 70. f. 1350, as M. krameri (this is the same figure 

 as that used by Schelle as M. heeseana) ; Cact. Journ. i : pi. for March; Blanc, Cacti 73. No. 

 1460; Deutsche Garten-Zeitung 1886: 186. f. 45, as M. petterssonii* 



Figure 90 is a reproduction of the first illustration cited above. 



37. Neomammillaria eichlamii (Quehl). 



Mammillaria eichlamii Quehl, Monatsschr. Kakteenk. 18: 65. 1898. 



Solitary or growing in large clumps of 25 or more, but loosely held together; plant-body cylindric, 

 6 to 15 cm. long; tubercles yellowish green, very milky, only slightly angled; axils filled with dense 

 yellow (sometimes whitish) wool and longer white bristles; radial spines 7 or 8, ascending, whitish 

 with brown tips; central spines usually i, rarely 2, stouter, darker colored than the radials; spine- 

 areoles when young filled with short yellow wool, in age glabrate ; flower-buds covered with long wool ; 

 outer perianth-segments narrow, acuminate, with a dark red stripe down the center, otherwise cream- 

 colored, slightly ciliate; inner perianth-segments narrowly lanceolate, acuminate, entire, cream- 

 colored to light lemon-yellow; style longer than the stamens, pale; stigma-lobes linear, 4 to 6, yellow, 

 obtuse. 



Type locality: Guatemala. 



Distribution: Guatemala and Honduras. 



This plant differs from the other Guatemalan species in the yellow wool in the axils of 

 the tubercles and in the areoles. 



Our first knowledge of this species came from a photograph and living and herbarium 

 material collected by Dr. William R. Maxon in Guatemala in 1 905 . In 1 908 Quehl described 

 it as new from specimens sent by F. Eichlam; the plant since then has been common in 

 cultivation. It flowered first in Washington, December 1909. 



* This name appears as M. petersonii in Blanc and Schumann. 



