THE CACTACKAE. 



from the latter in its more numerous 

 We find, too, that the radial spine: 



36 



# 



Rose's obscr\'ations. Dr. Zehntner also says it differs 

 finer spines, which are of a light orange-yellow color. 



are less spreading, while the centrals are much hke Liie ictuittis, ct^i^uxc^x, ^..^ ..v.. ^ 



subulate as in the other species, and the flowers appear to be smaller. 



Figure 41 shows a flower from the type plant. 



13. Cephalocereus leucostele (Giirke). 



Cereus leucostele Gurkc, Monatsschr. Kaktccnk. i8: 53- 1908. 



Plants normally simple, 2 to 5 meters tall, 4 to 8 cm. in diameter, the joints surrounded by 

 pcailiar bands or collars of long bristles; ribs 13 to 18, low; spines numerous, white, acicular, the 

 lateral ones spreading, the central much longer, 3 to 5 cm. long; flowers borne in a mass of wool 

 at top of plant but fruit becoming lateral by the prolongation of the stem ; perianth slightly curved 



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Fig. 43. — Cephalocereus smithianus. 



iXTsVo'jf r.vv ^t^l^ 1^^, fj"^^ ^^^l^^J 7 cm. long, opening in the early evening; perianth- 



^n^r c ust^th^^^^^^ '^^"^"^^ numerous, included; filaments white, the 



upper cluster thickly set all over the long throat, very short; the lower cluster few fixed at tin of 

 short tube proper, longer than the others, bent in just above their bases fominj a knee and pressini 



iTcm K'vlTS^^ '"^ r ^"^ '' ^V^"^^"^ ^^^^^ ^-^ definiTe ; perlTnThTubrprop^^^^ 



:ilrTheX^;efe^S^^^^^ 



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green 



cm 



