NEOMAMMILLARIA. 163 
Illustration: Emory, Mil. Reconn. 157. f. 2, as Mammillaria fasciculata, 
Figure 180 is from a photograph of a plant collected by F. E. Lloyd near Tucson in 
1906. 
145. Neomammillaria nelsonii sp. nov. 
Globose, 5 cm. in diameter; tubercles numerous, small, terete, apparently not milky, 5 to 7 
mm. long, their axils naked; radial spines about 15, acicular, white, 6 to 8 mm. long, spreading; 
central spines several, all like the radials; but one of them elongated, stouter and longer than the 
others, brown to black, strongly hooked, 12 to 15 mm. long; flowers unknown; fruit very slender, 
clavate, 3 cm. long or more, red, few-seeded; seeds globose, black, rugose, 2 mm. in diameter; hilum 
basal, triangular, white, depressed. 
Collected by E. W. Nelson on cliffs at La Salada, Michoacan, Mexico, March 23, 
1903 (No. 6932). 
This plant in its form and in the color and shape of the fruit agrees with Neomammil- 
laria but differs from all the species we know in its rather large rugose black seeds. It some- 
what resembles Neomammillaria zephyranthoides. 
Figure 182 shows the fruit, spine-cluster, and seed of the type. 
146. Neomammiillaria longiffora sp. nov. 
Solitary or clustered, small, 3 cm. in-diameter, apparently not at all milky ; tubercles small, 
terete, not grooved on upper side, 5 to 7 mm. long, rather closely set and nearly hidden by the spines; 
radial spines about 30, acicular, 10 to 13 mm. long, yellow or straw-colored, somewhat spreading ; 
central spines 4, reddish brown, much stouter than the radials, 3 of them straight, about length of 
radials, 1 of them hooked at apex, twice as long as others; flowers several, even on small plants, 
borne near top, 2 cm. long or more, with a distinct narrow tube; perianth-segments pinkish, oblong, 
acute; ovary very small, ovoid, more or less sunken in the axils, thin above and perhaps opening 
by an operculum, the lower part with the seeds persisting for years; seed nearly globose, minutely 
pitted, 1 to 1.5 mm. in diameter, black with a prominent white hilum. 
a b c 
Fic. 182.—Fruit, spine-cluster, 
and seed of N. nelsonii. 
fy 
Fic. 183.—Seed and spine-cluster of 
N. longiflora. 
Collected at Santiago Papasquiaro, Durango, by Dr. Edward Palmer in 1897 (No. 89). 
We have repeatedly studied this curious plant during the last 25 years, but have never 
been able to identify it or reach a definite conclusion as to its relationship. Our mareria 
consists of a single plant split down one side, bearing several withered flowers, a” ie 
detached flowers. Recently, we were sent a photograph of a cactus from Mexico, la ° e 
Mammillaria n. sp., Sierra de Cacaria S. de Ulama, which seemed to be Dr. Palmer’s plant 
and led us to make a detailed study of it. One of the peculiarities was the absence of 
an exserted ovary, so conspicuous in all the Neomammillarta. The cut stem showed an 
exposed sunken ovary, and by mere chance an old fruit with ripe seeds, probably sey “ 
years old, was found in the axils of one of the oldest tubercles. As described above, the 
seeds are very unlike those of any species of Neomammiullarta. 
