r^ 
FLORA OF North-western Mexico. 287 
H. D. p. 9, post Mamillanam formosam. 
225. Mamillaria sp.; species magna subovata 5" alta, 3" lata, primo aspectu ifaw/Z/wr/c* /c/r- 
mos(B affinis, sod differt mammiUis confcrtis elongato-tctragonis, spinis centralibus 6 robustis. 
This fine plant soon died. Received 1850. 
■ T 
J 
236. Mamillaria sp. ; magna, ovata, maniniillis tenuibus tctragonis, spinis centralibus 2-seto8i8 
sursum deorsum spcctantibus, cxtcrioribus numerosissimis totam plantam dense tcgentibus. Received 
1850. 
H. D. p. 12. § 5. Stelliger». 
227. Mamillaria sp. ; par\-ula, tenuibus affinis, emortua. Received 1850. 
H. D. p. 13. 
228. Mamillaria Pottsii, Sclieer, S. D. p. lOt. 
r 
Grows on limestone rocks near Chihualiua, at an elevation of 6000 to 7000 feet. Like many otliers, 
it will not succeed witb me. Probably great beat in summer, and great cold in winter, with a snow cover- 
ing, are essential to its well-being. There are three or four marked varieties of this plant. Received 1845. 
229. Mamillaria strobiliformis, Schcer, S. D. p. 104. Received 1846. 
H. D. p, 13, post Mamillariam ra^lantem, 
230. Mamillaria sp. Species radianti affinis, parvuhi, Isete vii'idis, cylindracea; planta emortua. 
Received 1847. 
231. .Mamillaria sp. M. radianti affinis, magna, robusta, altitudine 7", latitudine 4^", spinis 
radiantibiis, i" longis plusve, intertcxtis, plantje coufcrtim adprcssis, sub-18, grisco-albis, centralibus 
nullis ; planta emortua. Received 1849. 
H. D. p. 13, post Mamillariam similem. 
232. Mamillari.® inter se affines tres emortuBe.-T^S^fspecies elongato-cylindrica, apice tricipite, 
axillis albo-lanuginosis, mammillis subcylindricis plantae sursum adprcssis, Isevl^r supra sulcatis, 
griseo-viridibus, aculcis albis, centralibus 4, exterioribus sub-22, subsetosis.-^>Hr, spinis albis; 12,^ 
spinis rubro-brunneis, ambo pyraraidales ad basin prolifene. Received 1842. 
H. D, p. 13, post MamiUariam paj^'imarmnam. 
233. Mamillaria sp. (Missouriensis ?) ; parvula, subglobosa, viiidis; mammillis rcpandis elon- 
gatis cylindricis, supeme sulculo albo lanato munitis; axillis nudis; pulvillis rotundatis albidis; 
spinis exterioribus 12 plusvc rectis radiantibus tenuissimis albis, infcrioribus (^"longis) longissirais, 
interioiibus rubris, 3 supcrioribus plantse adpressis cum una centrali recta porrecta. Received 
1854. 
H, D. p. 14, post Maiiiillariam nivosam. 
234. Mamillaria sp. ; subcylindriea, pallide midis, apice parum imprcsso ; axillis albo-lanatis 
setosisque; interstitiis lanuginosis; mammillis confertis brevibus subconicis; arcolis rotundis mox 
nudis; aculeis sublaxis, exterioribus sub-20 subsctosis albis subfasciculatis reflcxo-radiantibus, inte- 
rioribus sub-4, pauUo robustiorlbus subulatis, nascentibus rubellis, deinde dcalbesccntibus. Planta 
prolibus ample munita. Received 1850. 
235. Mamillaiua sp. (species spcciosissima) j subcolumuaris, robusta, supeme applanata, obscure 
subglauca nitida ; mammillis confcrtis rbomboideis j pulvillis parum infra apicem mammillarum im- 
