The North American Species of Cactus, Anhalonium, and Lophophora | Page 7

evidently distributed first.
8.Cactus gummiferus (Engelm.) Kuntze. Rev. Gen. Pl. 260 (1891).
Mamillaria gummifera Engelm. Wisliz. Rep. 21 (1848).
Hemispherical, 7.5 to 12.5 cm. broad and 6 to 10 cm. high: tubercles 12
to 15 mm. long: radial spines 10 to 12, the lower stout, with dusky apex,
12 to 15 mm. long, twice or thrice as long as the whitish setaceous

upper ones; central spine (sometimes two) shorter (about 4 mm.), stout,
dusky and porrect: flowers 3 cm. long, reddish-white, brownish-red
outside: fruit unknown. (Ill. Cact. Mex. Bound. t. 9. figs. 18-20) Type
probably lost, as no specimens could be found in the Engelmann
Herbarium.
Chihuahua, near Cosihuiriachi.
So far as can be discovered, this species has not been collected since
the original Wislizenus collection of 1846-47. The plants were
cultivated by Dr. Engelmann and made to bloom, showing the flowers
to be larger and darker colored than in the rest of the group, from which
the species also differs in its more robust habit, its very unequal radial
spines, and the occasional occurrence of two centrals.
** Central spine hooked.
9.Cactus uncinatus (Zucc) Kuntze, Rev. Gen. Pl. 261 (1591).
Mamillaria uncinata Zucc. in Pfeiff. Enum. 34 (1837). Mamillaria
bihamata Pfeiff. in Otto and Deitr. Gart. vi. 274 (1840) Mamillaria
adunca Scheidw. (1845-1849?). Mamillaria depressa Scheidw.
(1845-1849?).
Usually globose (occasionally depressed or even subcolumnar), 5 to 6
cm. in diameter (doubtless becoming larger): tubercles 8 to 10 mm.
long, woolly in the upper axils: radial spines 4 to 6, rigid, 4 to 6 mm.
long, the upper one stouter than the rest and sometimes shorter,
reddish-brown and horny, straight or slightly curved, the remainder
straight and white with dusky tips; central spine stout and horny,
reddish-brown, 7 to 10 mm. long: flowers greenish-white or tinged with
red: fruit unknown Type unknown.
Entirely Mexican, reported from Chihuahua to Saint Luis Potosi.
Specimens examined: San Luis Potosi (Gregg of 1848; Parry 268;
Eschanzier of 1891): Chihuahua (Wislizenus of 1846-47; also
Chihuahua specimens cultivated in the Jacoby Garden in 1856 and
1857).
The variations observed in this species do not seem sufficient for the
establishment of varieties. The type form seems to have been globose,
with 4 radial spines and a stout central one. The depressed forms with 6
radials and a more slender central represent var. spinosior Lem. (M.
depressa Scheidw.); and the subcolumnar forms with 6 radials (the
upper one of which is somewhat curved) and a stout strongly hooked

central represent var biuncinata Lem. (M. bihamata Pfeiff.) Such
combinations of characters, however, do not hold, as any one of the
plant body forms may display any one of the spine characters referred
to.
B. Tubercles terete.
* Central spines none: mostly simple globose plants, with very
numerous straight whitish setaceous radials.
10. Cactus lasiacanthus (Engelm.) Kuntze, Rev. Gen. Pl. 259 (1891).
Mamillaria lasiacantha Engelm. Syn. Cact. 261 (1856).
Globose or ovate globose, 2 to 2.5 cm. high and 1 to 2 cm. broad:
tubercles 4 mm. long, about 2 mm. in diameter, with naked axils:
spines 40 to 60, in many series, very unequal, 2 to 4 mm, long, white
and pilose, the upper exterior usually longer than the rest, the innermost
usually much shorter: flowers 12 mm. long, whitish or pinkish (petals
with red median band): fruit 1 to 2 cm. long: seeds about 1 mm. long,
blackish and conspicuously pitted. (Ill. Cact. Mex. Bound. t. 3). Type,
the specimens of Wright in Herb. Mo. Bot. Gard.
From western Texas ("west of time Pecos, on low limestone hills,
among herbage") to Arizona and Chihuahua. Fl. April, May.
Specimens examined: Texas (Wright 121, also of 1852; Parry of 1852):
Arizona (Miller of 1881): Chihuahua (Pringle 213, 250,258): also
specimens cultivated in St. Louis in 1852 and 1855.
11. Cactus lasiacanthus denudatus (Engelm.).
Mamillaria lasiacantha denudata Engelm. Cact. Mex. Bound. 5 (1859).
Larger, 2.5 to 3.5 cm. in diameter, with longer tubercles (5 to 6 mm.),
and more numerous (50 to 80) longer (3 to 5 mum.) spines which are
naked or nearly so. (Ill. Cact. Mex. Bound. t. 4) Type, Wright specimen
in Herb. Mo. Bot. Gard.
From western Texas (with the species) to Coahuila.
Specimens examined: Texas (Wright of 1852): Coahuila (Palmer of
1880).
In the Syn. Cact. Dr. Engelmann merges this variety with the species,
and has been followed in this by subsequent writers, but the characters
seem so (distinctive that its varietal rank has been restored.
12. Cactus micromeris (Engelm.) Kuntze, Rev. Gen. Pl. 260 (1891).
Mamillaria micromeris Engelm. Syn. Cact. 260 (1856).
With depressed top and very rarely branching, 1 to 3.5 cm. in diameter:

tubercles very small (about 1 mm. long) and wart-like, crowded,
shedding the spines with age and giving the base of the plant a
tuberculated appearance: spines from white to ashy-gray, 1 to 3