CEPHALOCEREUS. 



39 



-Flower of C. deeringi 

 -I'Vnil of same. X0.7 



Type locality: Lower Matecumbe Key, Florida. 



Distribution: Rocky hammocks, Lower Matecumbe Key, Florida. 



The plant was named for Charles Deering, whose deep interest in the botanical explora- 

 tion of Florida and in the preservation of its hammocks from destruction and its rare native 

 plants from extermination, enabled Dr. Small to re- 

 discover, study, and satisfactorily determine the rela- 

 tionship of this plant. 



Plants similar to those from Upper and Lower 

 Matecumbe Key have been collected on Umbrella Key, 

 which is a few miles north of Lower Matecumbe, and 

 these plants represent, without much doubt, the same 

 species. 



Illustration: Journ. X. Y. Bot. Gard. 18: pi. 206. 



Plate iv, figure 4, shows a fruit from the type plant; 

 plate V is from a photograph of the type colony of 

 plants on Lower Matecumbe Key, taken by Dr. Small 

 in May 191 7. Figure 50 shows the flower and figure 

 51 the fruit with withering persistent corolla. 



17. Cephalocereus robinii (Lemaire). 



Pilocereus robinii Lemaire, Illustr. Hort. 11: Misc. 74. 1864. 

 Cephalocereus bakeri Britton and Rose, Contr. U. S. Nat. Herb. 12: 415. 

 Cereus bakeri Vaupel, Monatsschr. Kakteenk. 23: 23. 1913. 



Plant 3 to 8 meters high, 

 branching near and above the 

 base; branches ascending, 7 to 10 

 em. thick, dull green, bright glau- 

 cous green when young; ribs 10 to 

 13, acutish; areoles 1 to 1.5 cm. 

 apart, bearing short wool; spines 

 15 to 20, acicular, 1 to 2.5 cm. 

 long, yellow when young, becom- 

 ing gray, the centrals hardly 

 different from the radials ; flower- 

 ing areoles close together; flowers 

 brownish green, 5 cm. long, 3 cm. 

 broad at widest part of throat, 

 constricted at top of tube proper, 

 alliaceous in odor; tube green and 

 slightly glaucous ; ovary and lower 



-Flower of C. robinii. X0.7. 

 -Fruit of same. X0.7. 



Fig. 54. — Cephalocereus robin 



part of tube with a few small scales ; upper scales broadly ovate with bluish purple tips passing 

 into greenish or eream-colored perianth-segments, the inner segments white ; tube proper very short 

 (1 em. long or less); throat 2.5 cm. long, bearing stamens all over its surface; stamens white, 



