CEPHALOCEREUS. 



39 



FIG. 50. Flower of C. deeringii. 

 IMC. . s>. Fruit of same. Xo.y. 



Xo, 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. N. Y. Bot. Card. 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 1917- Figure 50 shows the flower and figure 

 51 the fruit with withering persistent corolla. 



17. Cephalocereus robinii (Lemaire). 



Pilocereiis robinii Lemaire, Illustr. Hort. n: Misc. 74. 1864. 



Cephalocereus bakeri Britton and Rose, Contr. U. S. Nat. Herb. 12: 415. 1909. 



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 

 cm. thick, dull green, bright glau- 

 cous green when young ; ribs i o to 

 13, acutish; areoles i to 1.5 cm. 

 apart, bearing short wool; spines 

 15 to 20, acicular, i 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 



Fir,. 52. Flower of C. robinii. Xo.j. 

 FIG. 53. Fruit of same. Xo.?. 



FIG. 54. Cephalocereus robinii. 



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

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

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



