MAMMILLARIA 



MAMMILLAEIA 



973 



hooked spines, except in M. un- 

 cinata. Section Lactescentes. 

 B. Fls. red or purple or carmine, 

 said to be yellow in Park- 

 insonii. 



C. Spines terete: r a dials 

 white, setaceous, numer- 

 ous, interwoven and cov- 

 ering the plant: stems at 

 length cylindrica I orclav- 

 ate: axils woolly 61. bicolor 



62. Parkinsonii 



63. formosa 

 CC. Spines few, stouter, often 



angular, some of the cen- 

 trals very long and more 

 or less flexuous : tuber- 

 cles rather large, angled: 

 axils woolly 64. angularis 



65. centricirrha 



66. mutabilis 



67. Heeseana 

 SB. Fls. whitish, yellowish or 



flesh-color. 



c. Radial spines 9-22, seldom 

 less than 12: tubercles 

 slender, scarcely angled. 68. simplex 



69. Brandegei 



70. Heyderi 

 CC. Radial spines rarely as 



many as 9: body mostly 



depressed 71. meiacantha 



72. came a 



73. uncinata 



74. Trohartii 



75. sempervivi 



76. Caput-Medusae 



77. micromeris 



INDEX. 



acanthophlegma, 60. 

 Alversoni, 20. 

 ancistracantha, 1. 

 angularis, 64. 

 applanata, 70. 

 arietina, 65. 

 Arizonica, 20. 

 armillata. 45. 



aulacothele, 2. 

 aureiceps, 55. 

 autumnalis, 66. 

 barbata, 37. 

 bicolor, 61. 

 Bocasana, 41. 

 borealis, 20. 

 Brandegei, 69. 



Brownii, 6. 

 calcarata, 14. 

 Candida, 39. 

 Caput-Medusaa, 76. 

 carnea, 72. 

 Carretii, 51. 

 centricirrha, 65. 

 chlorantha. 20. 



1. raphidacantha, Lem. Steins becoming 1 ft. or more 

 long, 2-3 in. in diam., often clavate: tubercles erect- 

 spreading, somewhat flattened, often with 1 or 2 glands 

 in the groove: spines yellow in the young state, soon 

 gray; radials 6-10; central 1, longer and stouter, straight 

 or hooked in the same plant : fls. about 1 in. broad. 

 San Luis Potosi, Mex. The more constantly hooked 

 form is M. ancistracantha, Lem. 



2. macrothele, Mart. (M. aulacothele, Lem. M. Lh- 

 manni, Otto). Stems stout, attaining nearly 2 ft. in. 

 height by 4 in. in diam. : tubercles long, conical, at first 

 upright, in age becoming even deflexed: spines all yel- 

 low; radials 6-8, spreading; centrals 1-2, longer and 

 stouter: fls. l%-2 in. broad. Central Mex. 



3. ercta, Lem. Branching from base and from de- 

 cumbent stems, attaining 12 in. or more in height by 3- 

 in. in diam., bright green: tubercles conical, short, up- 

 right: spines all yellow; radials 8-13 ; centrals 4 or 

 less: fls. 2-2 K in. in diam. Cent. Mex. In the groove 

 close to the spines is often found, especially in the 

 flowering area, a conspicuous honey gland. 



4. recurvata, Engelm. (M. recurvispina, Engelm. 

 M. Nogal&nsis, Runge). Stems depressed-globose and 

 often deeply concave, 6-8 in. in diam., forming large 

 masses 1-3 ft. in diam. : tubercles short, with usually a 

 large gland in the groove near the apex: spines yellow 

 or whitish, stiff, recurved-pectinate, interwoven and 

 covering the whole plant ; radials 18-20 ; central 1, 

 rarely 2, recurved : fls. about 1 in. long, brownish out- 

 side. Near Nogales, Arizona, and southward in Sonora. 



5. Scheerii, Muhlpf. Stems ovate-globose, 3-6 in. in 

 diam., usually simple: tubercles large and distant, 

 deeply grooved, with 1-5 glands in the groove: spines 

 stout, rigid, sometimes reddish; radials 6-16; centrals 

 1-5, stouter and longer, 1 very stout and porrect : fls. 

 2 in. long: seeds large for the genus. S. W. Texas and 

 southward in Mexico. 



6. robustispina, Engelm. (M. Brdwnii, Tourney). 

 Much like the preceding, but tubercles teretish, no- 

 glands in the groove or sometimes a single one at apex: 

 spines very stout ; radials 10-15 ; central 1, longer, 

 straight, curved or even hooked, rarely an additional 

 straight upper one: fls. 2 in. long, with very slender 

 tube: seeds large. Babuquibari mountains south of 

 Tucson, Ariz. 



