94 THE CACTACEAE. 
Schumann refers here Mammillaria cirrhifera, but certainly Pfeiffer’s illustration 
(Abbild. Beschr. Cact. 1: pl. 7) with its long, curved, radial spines and no centrals is very 
different; we have referred it to Neomammillaria magnimamma. 
Illustrations: Nov. Act. Nat. Car. 16: pl. 21; Méllers Deutsche Gart. Zeit. 25: 475. 
f. 8, No. 17, as Mammillaria mystax; Mdllers Deutsche Gart. Zeit. 25: 475. f. 8, No. 1; 
Karsten and Schenck, Vegetationsbilder 1: pl. 44; Schelle, Handb. Kakteenk. 272. f. 195, 
as M. mutabilis; Schelle, Handb. Kakteenk. 273. f. 196, as M. mutabilis longispina. 
Plate rx, 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 Mammnillaria 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. By fel 
Illustrations: Ann: Rep. Smiths. Inst. 1908: pl. 7; Schelle, Handb. Kakteenk. 265. f. 
188, as Mammillaria heeseana; Blanc, Cacti 7o: f..1350, as M. krameri (this is the same figure 
as that used by Schelle as M. heeseana); Cact. Journ. 1: pl. for March; Blanc, Cacti 73. No. 
1460; Deutsche Garten-Zeittng 1886: 186. f. 45, as M. petterssonit.* 
Figure go is a reproduction of the first illustration cited above. 
37. Neomammillaria eichlamii (Quel). 
Mamumillaria 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 1, 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 1905. In 1908 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. 
