ESCOBARIA. 53 
>3. Neobesseya missouriensis (Sweet). 
Cactus mammuillaris Nuttall, Gen. Pl. 1: 295. 1818. Not Linnaeus, 1753. 
ammullaria missouriensis Sweet, Hort. Brit. 171. 1826. 
Mammillaria simplex Torrey and Gray, Fl. N. Amer. 1:.553. 1840. 
77 Mammillaria nutiallu Engelmann, Pl. Fendl. 49. 1849. 
Mammillaria nuttallii borealis Engelmann, Proc. Amer. Acad. 3: 264. 1856. 
Cactus missouriensis Kuntze, Rev. Gen. Pl. 1: 259. 1891. 
Mammillaria missouriensis nuttallit Schelle, Handb. Kakteenk. 241. 1907. 
Coryphantha missouriensis Britton and Rose in Britton and Brown, Illustr. Fl. ed. 2. 2: 570. 1913. 
Plants solitary or cespitose, globose, 2.5 to 5 cm. in diameter; tubercles more or less spiraled, 10 
to 15 mm. long; spines ro to 20, acicular, gray, pubescent, all radial or sometimes 1 central; flowers 
greenish yellow; outer perianth-segments narrowly oblong, gradually tapering to an acute apex, 
ciliate; inner segments linear-lanceolate, attenuate; fruit globose, scarlet, about 1 cm. in diameter; 
seeds 1 mm. in diameter. 
Type locality: On the high hills of the Missouri, probably to the mountains. 
Distribution: North Dakota to Montana, Colorado to Kansas, Oklahoma, and perhaps 
northern Texas. 
This little cactus has a wide distribution on the Great Plains; both its conspicuous 
yellow flowers and its round red fruits are very attractive. 
Coryphantha nuttallii, credited to Engelmann, is cited as a synonym of Mammillaria 
nuttallit by Riimpler (Forster, Handb. Cact. ed. 2. 407. 1885). a 
Illustrations: Meehan’s Monthly ro: pl. 3; Gartenwelt 1: 85, as Mammiullaria mis- 
sourtensis; Gartenwelt 1: 89, as M. missouriensis viridescens; Britton and Brown, IIlustr. 
Fl. 2: f. 2525, as Cactus missouriensis; Schelle, Handb. Kakteenk. 241. f. 160, as M ; 
missouriensis nuttalliii; Cact. Mex. Bound. pl. 74, f. 6, as M. nuttallit borealis; Blanc, Cacti 
72. No. 1426; Blithende Kakteen 3: pl. 145, as M. nutialli:; Britton and Brown, Illustr. 
Fl. ed. 2. 2: f. 2984, as Coryphantha missouriensts. 
Plate x1, figure 4, shows a plant from a large clump sent by Professor C. O. Cham bers 
in 1921 from Stillwater, Oklahoma. 
4. Neobesseya notesteinii (Britton). 
Mammiilaria notesteinii Britton, Bull. Torr. Club 18: 367. 1891. 
Cactus notesteinit Rydberg, Mem. N. Y. Bot. Gard. 1: 272. 1900. 
Oval, solitary or cespitose, about 3 cm. in diameter; tubercles nearly terete, about 6 mm. 
high; spines 12 to 18, white, turning gray, weak, slender, 8 to 12 mm. long, pubescent throughout, 
a central one usually present and frequently pink-tipped; flowers 15 to 25 mm. broad, ash-gray, 
tinged and penciled with pink, the segments broadly linear-oblong, mucronate, Iruit obovoid, 
seeds black, globose, pitted. 
Type locality: Near Deer Lodge, Montana. _ 
Distribution: Known only from the type locality. _ ‘ound it 
Professor F. N. Notestein, who first collected and observed this little cactus, found i 
in gravelly soil near a small creek; it differs from the other species of the genus in the color 
of the flowers and the more pubescent spines. 
77) 8, ESCOBARIA gen. nov. 
indricy usta i i ilky; d above, persisting 
llv cespitose cacti, never milky; tubercles groove 
as knebe at the fee of old plants after the spines have fallen; spines both central and radial, never 
i f groove of young tubercles; 
h ; 1, lar, appearing from top of plant at bottom ol § 
stamens and style aneluded: fruit red, naked (or with one scale), indehiscent, globular to oblong, 
crowned by the withering perianth; seeds brown to black; aril basal or subventral, oval. 
Type species: Mammillaria tuberculosa Engelmann. _— 
The “wo species of this genus known to Schumann were placed by him in the subgenus 
Coryphantha of Mammillaria; they are like the Coryphanthae in having grooved flower- 
bearing tubercles, but are otherwise different, especially in an flowers fruit, and seeds. 
i ies i southern Texas. 
Eight species are known from northern Mexico and sou 
The genus commemorates the work of two distinguished Mexicans, the Escobar 
brothers, R6mulo and Numa, of Mexico City and Juarez. 
