I 
FLOHA OF NOKTH-WESTERN MEXICO. 289 
. oo^Vm'''"'''''''''^ 'P'^ ^^^^ '^'''^''' mammillis latis depressis, subtctragonis ; setis extcrioribus 
sub 30, ^ longis albis laxo-crispatis, centralibus 4-5 robustioribus rcctis, totis cburucis. Planta 
emortua. Received 1850. 
^ 245. Mamillauia sp. ; viridis; mammUlis nasccntibiis obscure tetragoms elongatis, dciiidc brc- 
iioribTis, ultimo dcpresso-applanatis acuto-quadrangularibus ; aculcis intcrioribus 6 brunneis: extc- 
nonbus 24 mmutis albis. Planta emortua. Received 1850. 
The change in the shape of the mammilla? \vas a very remarkable circumstance. 
H. D. p. 19. § 10. 
246. Mamillaria sp.; emortua: species M. rhaphidacanth(B subaffinis. Received 184G. 
247. Mamillaria heteromorpha, Scbeer, S. D. p. 128. Emortua. Received 1812. 
H. D. p. 20. § llt 
248. Mamillaria; species cornifcrai affinis, aculeo centrali dcorsum multissime incurvato 
Emortua. Received 1848. 
249. Mamillaria sp. ; M. ScoJymoidei subaffinis, magna robusta ovata obscure viridis, prolifera, 
apice sublanugiuoso parum impresso; axillis mox nudis; mammillis primnm subconicis, dcinde 
turgido-triangularibus, superne subsulcatis, plantam sursum adprcssis, magnis, pollicaribus ; sulcis 
glanduhs munitis; aculeis flexuosis, extcrioribus sub IG subfasciculatis radiantibus, inferiori})us Ion- 
gissimis, centrali uuo (liinc inde 2 vcl 3) multo longiore robustiore curvato-porrccto. Emortua. 
Received 1845. 
250. Mamillaria sp. • M. ScoJymoidei affinis, ovata, dura, pallidc viridis apice multo-lanuginoso ; 
mammillis superne adpressis; aculcis triformibus; extcrioribus sub 15Jd est semper 7 inferioribus 
rcctis subapplanatis radiantibus k longia diaphanis, 8 plusvc superioribus duplo longioribus tenuiori- 
bus teretibua flexilibus erectis reflexis subfascicidatis, dimidio supcriori subuigri, cum 4 intcrioribus 
cruciatim dispositis dcorsum curvatulis. Received 1850. 
251. Mamillaria sp.j M. Scolymoidei affinis, magna dura robustissima erccta cylindrica dis- 
tincte columnaris, altitudine 7", latitudine 4"brunnea, ad basin prolifcra. Emortua. Received 1850. 
H. D. p. 20. § lift. 
252. Mamillaria Salm^Dijckiana, Scbeer, 11. D. p. 131-._— Otto ct Dietr. Allg. Gartenz. Jahrg. 
1850. no. 50.— Grows on limestone mountains thirty mUes north-west from Chihuahua, in company 
with M. PoitslL Var. ^ comes probably from Sonora. Received 1845. Emortua. Adest variet^ 
spinis rectis brevioribus nigris. 
253. Mamillaria Scheerii, Miihicnpf, H. D. p. 134.— Bacca elongata 2"longa, pallide lutea.— 
Grows in red sandy loam around Chihuahua. Emortua. Received 1845. 
H. D. p. 20. § llttt. 
254. Mamillaria sp. ; M. Elejjhantidenii vel Eckinocactoidei subaffinis, sed mammillis parvulis. 
Emortua. 
255. EcHiNOCACTUs horizonthahnms, Lcm. — M. equitans, Scheid. Echinoc. magnus robustus 
7"altus"8 latus, 8rC0status; costis repandis; spinis uncialibus; iiifcrioribus semper 4 subajqualibus 
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