PACHYCEREUS. 



75 



Figure no shows a flower drawn" from an herbarium spedmen collected by P^ward 

 Palmer at San Luis Potosi, Mexico, in 1905; figure iii is from a photograph of the plant 

 used as a hedge near the Citv of Mexico. 



Fig. 1 1 1 .— Pachycereus margtnatus used as a hedge plant in Mexico. 



8. Pachycereus ruficeps (Weber). 



Pilocereus ruficeps Weber in Gosselin Bull. Mus^ Hist. Nat. Paris ii : 509. 190.S. 

 Cereus ruficeps Vaupel, Monatsschr. Kakteenk. 23 • 27- I9i3- 



trunk 



branches erect; ribs about 26; young 



ravish- central spines i to 3, the longest 4 to 5 cm. long, poirecL ui "^"J*^"- "-"' 

 ^T^h^'Z'l^^^ . cm lone. the%vary and tube bearing small chartaceous 



stamens 



:^Ss!"yJe stoutr'ught IZ^^^J:^^^^^^ 7 to 9; fruit s.„a.,, not edib.e; seeds s^all, bro»„. 



ish, shining. 



Type locality: Near Tehuacan 

 Distribution: Oaxaca, Mexico 



^^Z haXn desc^ed rather fully by RCand-Gosselin, but we are still in 



some 



Dr 



Cephalocereus macrocephalus, which seems 



When Dr. Rose was at the Museum 



made by M 



Illustration 



ificcps 



