Botanical Ecology of the Dry Tortugas. 



125 



GARDEN KEY. 



This island is the second largest in the group and to a considerable 

 extent is occupied by that antiquated, massive old brick structure, 

 Fort Jefferson (plate 4) . Almost all the history and tradition of this 

 remote group of islands centers about Garden Key and the fort. As a 

 fitting corollary to this, it also has the largest and 

 richest flora in point of species of any of the keys. 



Garden Key, with outlines of Fort Jefferson and adjacent buildings. 

 Two inches = one-fifth statute mile. 



^K 1. Altenianthera maritima 



! 2. Argemone leiocarpa. 



*!* 3. Atriplex cristata. 



3U 4. Avicennia nitida. 



+ 5. Cakile lanceolata. 



L 6. Calonyction tuba. 



7. Canavali lineata. 



3 8 . Capriola dactylon . 



A 9. Cenchrus incertus. 



10. Chamaesyce buxifolia. 



11. Chamaesyce hypericifolia. 

 | 12. Cyperus brunneus. 



^ 13: Glottidium vescarium 



jil 14. Guilandina crista. 



15. Hymenocallis caymanensis. 

 JS 16. Ipomoea pes-caprae. 



iK 17. Iva imbricata. 



E3 18. Lepidium virginicum. 



^ 19. Leptilon canadense. 



| 20. Melanthera brevi folia. 



O 21. Opuntia dillenii. 



II 22. Paspalum caespitosum. 

 jQ. 23. Portulaca oleracea. 



J. 24. Ricinus communis. 



qjs 25. Rhizophora mangle. 



O 26. Scaevola plumieri. 



A 27. Sesuvium portulacastrum. 

 Df 28. Sonchus oleraceus. 



J) 29. Sporobolus virginicus. 



3 30. Suriana maritima. 



III 31. Syntherisma marginatum. 

 V 32. Thespesia populnea. 



1" 33. Tournefortia gnaphalodes. 



f. 34. Uniola paniculata. 



A 35. Valerianoides jamaicense. 



A glance at the map shows that the island on the northeast side pro- 

 jects beyond the walls of the fort by a short arm, with the ruins of a 

 series of coal-sheds and loading-trestles on its eastern side. 



The southern side has quite a large extension outside the walls and 

 on it are likewise ruined coal-sheds, a covered dock, and several old 

 sheds, formerly pumping-houses, etc.; this portion also has the larger 

 number of species. This is probably due to the fact that it is larger 



