Escobara missouriensis Sweet D R Hunt 1978

ball cactus, cream cactus, missouri pincushion

Mammillaria missouriensis Sweet 1826, Coryphantha missouriensis (Sweet) Britton & Rose 1913, Neobesseya missouriensis (Sweet) Britton & Rose 1923 Mammillaria similis Engelmann 1845, Coryphantha similis (Engelmann) Britton & Rose 1913, Neobesseya similis (Engelmann) Britton & Rose 1923, Escobaría missouriensis var. similis (Engelmann) N.P.Taylor 1983

Mammillaria similis var. caespitosa Engelmann 1850, Escobaría mis-

souriensis var. caespitosa (Engelmann) D. R. Hunt 1978 Mammillaria notesteinii Britton 1891, Neobesseya notesteinii (Britton)

Britton & Rose 1923 Mammillaria wlssmannii Hildmann 1898, Neobesseya wissmannii

(Hildmann) Britton & Rose 1923 Coryphantha asperispina Boedeker 1929, Neobesseya asperispina (Boedeker) Boedeker ex Backeberg &F. M. Knuth 1935, Escobaría asperispina (Boedeker) D. R. Hunt 1978, E. missouriensis var. asperispina (Boedeker) N. P. Taylor 1983, E. missouriensis subsp. asperispina (Boedeker) N. P.Taylor 1998 Neobesseya rosiflora Lahman ex G. Turner 1937 Coryphantha marstonii Clover 1938, C. missouriensis var. marstonii (Clover) L. D. Benson 1969, Escobaría missouriensis var. marstonii (Clover) D. R. Hunt 1978 Escobaría missouriensis subsp. navajoensis Hochstátter 1996

Plants solitary to many-stemmed, often forming clumps. Stems globose to depressed globose, 2.5-5 cm (1-2 in) high, 3.8-10 cm (1.5-3.9 in) in diameter. Tubercles elongate, 2-18 mm (to 0.7 in) long. Central spines absent. Radial spines 10-20, dense and mostly obscuring the stem, yellowish, becoming dark gray, finely hairy, spreading, straight, 10-20 mm (0.4-0.8 in) long. Flowers greenish yellow to yellow to pink, 2.5-6.2 cm (1-2.5 in) long and in diameter. Fruits globose to obovoid, red, 1-2 cm (0.4-0.8 in) long. Distribution: grassland and pinyon-juniper woodland in central Idaho, North Dakota, Kansas, northern Arizona, and western New Mexico, and Coahuila and Nuevo León, Mexico.

Two subspecies of Escobaría missouriensis are recognized.

Subspecies missouriensis has tubercles 6-9 mm (0.2-0.4 in) long, 10-20 radial spines, and yellow or pink flowers; it occurs in Idaho, North Dakota, Kansas, New Mexico, and Arizona. Subspecies asperispina has tubercles to 18 mm (0.7 in) long, 9-10 radials, and greenish yellow or cream flowers; it occurs in southeastern Coahuila and adjacent Nuevo León. A third subspecies, E. missouriensis subsp. navajoensis, is recognized by some; it occurs only in Navajo County, Arizona, and is characterized as having tubercles only 2 mm long and flowers 2-3 cm (0.8-1.2 in) in diameter that are yellowish with dark midveins.

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