Backeberg & F. M. Knuth 1935 Neomammillaria hutchisoniana H. E. Gates 1934, Ebnerella hutchisoniana (H. E. Gates) Buxbaum 1951, Chilita hutchisoniana (H. E. Gates) Buxbaum 1954 Neomammillaria bullardiana H. E. Gates 1934, Mammillaria bullar-diana (H. E. Gates) Boedeker ex Backeberg & F. M. Knuth 1935, Ebnerella bullardiana (H. E. Gates) Buxbaum 1951 Mammillaria louisaeG. E. Lindsay 1960, M. hutchisoniana subsp. louisae(G. E. Lindsay) D. R. Hunt 1997
Plants solitary to several-stemmed. Roots fibrous. Stems cylindrical, olive green, to 15 cm (5.9 in) high, 4-6 cm (1.62.4 in) in diameter. Tubercles short, conical, without latex, axils with scant wool or naked. Central spines 4, tan with purplish tips, 7-10 mm (0.3-0.4 in) long, lowermost one hooked. Radial spines 10-20, straight, slender, needle-like, purplish, 5-8 mm (0.2-0.3 in) long. Flowers pinkish to cream, with dark midveins, 25-30 mm (1-1.2 in) in diameter. Fruits club shaped, scarlet, to 20 mm (0.8 in) long. Seeds black. Distribution: widespread on the Baja California Peninsula, Mexico.
Two subspecies of Mammillaria hutchisoniana are recognized. Subspecies hutchisoniana has a variable number of ra-
424 Mammillaria hutchisonlana dial spines and cream-colored flowers; it occurs widely in Baja California, from La Paz, Baja California Sur, northward. Subspecies louisae usually has about 11 radial spines and white to light pink flowers with lavender-pink midveins; it is restricted to a coastal region near Socorro, Baja California.
Mammillaria insularis h. e. Gates 1938 Ebnerella insularis (H. E. Gates) Buxbaum 1951, Chllita insularis (H.E.Gates) Buxbaum 1954
Plants sometimes solitary but usually forming clusters. Roots fleshy. Stems flattened globose, blue-green, to 6 cm (2.4 in) high and 5 cm (2 in) in diameter. Tubercles truncate conical, without latex, axils naked or slightly woolly. Central spine one, hooked, with black tip, to 10 mm (0.4 in) long. Radial spines 20-30, needle-like, white, to 5 mm long. Flowers funnelform, light pink, 15-25 mm (0.6-1 in) long. Fruits club shaped, orange-red, to 10 mm (0.4 in) long. Seeds black. Distribution: islands and mainland near Bahia de Los Angeles, Baja California, Mexico.
Mammillaria jaliscana (Britton & Rose) Boedeker 1933 Neomammillaria jaliscana Britton & Rose 1923, Ebnerella jaliscana
(Britton & Rose) Buxbaum 1951 Mammillaria zacatecasensis Shurly 1960, M. jaliscana subsp. zacate-
casensls (Shurly) D. R. Hunt 1997 Mammillaria fuscohamata Backeberg 1962 Mammillaria kleiniorum Appenzeller 1986
Plants branching basally and forming clumps. Stems globose to short cylindrical, bright green, 5-6 cm (2-2.4 in) in diameter. Tubercles tapered cylindrical, rounded apically, occasionally with latex, axils naked. Central spines 5—14, red
dish brown with dark tips, 7-9 mm (0.3-0.4 in) long, lower one hooked. Radial spines 30-40 or more, straight, white, to 5 mm long. Flowers delicately fragrant, pink, to 20 mm (0.8 in) in diameter. Fruits bluntly club shaped, white to dull pinkish red, to 8 mm (0.3 in) long. Seeds brownish black, finely pitted. Distribution: Jalisco, Michoacán, and Zacatecas, Mexico. Mammillaria jaliscana appears to be closely related to M. mercadensis.
Mammillaria johnstonii (Britton & Rose) Orcutt 1926
Neomammillaria johnstonii Britton & Rose 1923
Plants usually solitary but occasionally clustering basally. Stems globose to short cylindrical, dull bluish gray-green, 15-20 cm (5.9-7.9 in) high. Tubercles four-angled, with latex, axils naked. Central spines 2, rarely 4-6, bluish brown, straight, one erect, others diverging, 10-25 mm (0.4-1 in) long. Radial spines 10-14, stiff, needle-like, white with brown
Mammillaria kraehenbuehlii 425
tips, 6-9 mm (0.2-0.4 in) long. Flowers white to pale pink to cream, with pink to brownish midveins, to 20 mm (0.8 in) in diameter. Fruits globose, swollen, scarlet. Seeds brown. Distribution: San Carlos Bay, Sonora, Mexico.
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