FEB. 1907. FLORA SAND KEYS OF FLORIDA MILLSPAUGH. 239 



grove colony. The exception is Key "B" of the Marquesas group, 

 where it is present notwithstanding the fact that the mangrove is en- 

 tirely absent; and Marquesas Keys 4< F" and "I," and Man and Ballast 

 Keys, where although the mangrove colony borders seem espe- 

 cially suitable to its growth, the Laguncularia has not yet, at least, 

 become implanted. 

 Opuntia Dillenii: 



This common Antillean cactus is one of the most readily avevec- 

 tent species. Its implantation on Bird and Garden Keys is therefore 

 not at all unnatural. Although, from its location on Loggerhead Key 

 the introduction of the species might well be supposed to be homo- 

 vectent, yet, as I have noted its presence on other tropic sand keys 

 where of a certainty man would not have planted nor even conveyed 

 it, I feel justified in considering the presence of the plant also natural 

 in this situation. 

 Oreodoxa regia: 



About half a dozen of these Royal Palms still stand on Marquesas 

 "E" near the charcoal burner's hut* to which situation they were doubt- 

 less transplanted from the neighborhood of Cape Sable, probably by 

 the coalers themselves. They served the camp two purposes: that of 

 shade, and as a much needed landfall when returning from boat 

 expeditions. 

 Pithecolobium guadalupense: 



The bony seeds of this species are partly invested by a fleshy aril 

 attractive to birds both in color and in taste. This species becomes 

 quite readily transplanted through the medium of the larger migrating 

 land birds. 

 Rhizophora mangle: 



This species occurs upon all the islets between Key West and the 

 Marquesas group, and upon all the islets of that group except key "B" 

 where the shores are too strongly current-washed to permit of its 

 gaining a roothold. Many of the smaller keys noted upon the charts 

 of this region proved, in so far as they could be examined, to be pure 

 colonies of this species with no dry land among the plants. The 

 mangrove has not yet found a resting place upon any of the Tortugas. 

 This species yields one of the best and hardest of charcoals and was 

 at one time extensively "burned" upon Marquesas "E". 



* See under Rkitophora mangle. 



