( 
7 
brevi-ovatis axilla lanata setigeris ; aculeis radiantibus 11-15 albidis, 
centralibus 3-4 fusco-atris, inferiore paulo longiore deorsum unci- 
nato ; floribus lateralibus. _ 
San Diego, California. — Two or three inches high. Radial 
spines 2}~3} lines long; the lower central spine a little longer. 
Flowers apparently yellowish-white, and half an inch in diameter. 
§ 3. Setose, Salm. 
9. M. srcotor, Lehm.: depressa, ovata, s. cylindracea, prolifera ; 
-axillis lanatis ; tuberculis parvulis conicis ; aculeis exterioribus 16-20 
tenuissimis recurvato-radiantibus, centralibus 2—4 rigidis, majoribus 
albis apice nigris interdum subpollicaribus, supremo plerumque longis- 
simo ineurvo ; floribus parvulis purpureis; stigmatibus 5. 
Abundant on the calcareous hills of the Rio Grande below Laredo, 
Texas, Dr. Poselger : fl. June and July. — Plant 3 - 12 inches high, 
the larger specimens 2-3 inches in diameter ; radial spines 1-2, 
lower central ones 4—5, the upper 6-10 lines long. Flower about 
9 lines long. 
§ 4. Centrisping, Salm. (All our species are simple and 
have a milky juice.) 
10. M. Heypert, Muhlenpf. (1848): simplex, depresso-globosa ; 
tuberculis elongatis pyramidatis subquadrangulatis ; aculeis radianti- 
0~20 rectis, inferioribus longioribus, centrali singulo breviore ; 
floribus lateralibus sordide rubellis ; baccis elongato-clavatis ; semini- 
bus parvis rugulosis fulvis. 
Var. a, appLanata (M. applanata, E. in Pl. Lindh. 1850): vertice 
applanato s. depresso, aculeis radialibus 15-22. 
Var. 8. nEMIspH#Rica (M. hemispherica, E. J. c.): vertice con- 
vexo, aculeis radialibus 9 — 12. 
From San Antonio and New Braunfels, Texas, to Matamoras and 
westward to El Paso: fl. April, May.— Var. a. is the Northern and 
Western, and 8. the Southern form.— M. declivis, Dietr. seems to 
belong here ; but I have never met with a description of this plant. 
1]. M. meracanrna, E. in B.C. R.: hemispherica ; tuberculis quad- 
rangulato-pyramidatis compressis ; aculeis paucis (5-9) rigidis rectis 
s. recurvatis, inferioribus paulo longioribus, centrali singulo erecto s. 
sursum flexo et cum ceteris radiante; floribus et baccis precedentis. 
Western Texas and New Mexico. — Very similar to the last; but 
tubercles larger, more compressed, more loosely arranged ; the spines 
fewer and stouter ; perhaps only a variety of it. 
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