FEB. 1907. FLORA SAND KEYS OF FLORIDA MILLSPAUGH. 197 



MAN KEY 

 MARCH 13, 1904 



Q) Alternanthera brasiliana (2353) 3 Galactia spiciformis (2332) 



Andropogon glomeratus (2325, 2357) o Hymenocallis caribaea (2326) 



f Avicennia nitida (2335) > Ipomoea pes-caprae (2330) 



fy 1 Batis maritima (2339) $ Iva imbricata (2342) 



< Borrichia arborescens (2360, 2334) Melanthera nivea (2333, 2348, 



Z Bradburya virginiana (2347, 2350) 23483) 



A Cakile fusiformis (2324. 2328, 2343, Y Panicum maximum (2345) 



2344, 2358) "3 Paspalum distichum (2329) 



cf Cenchrus tribuloides (2346) ** Pithecolobium guadalupense (2362) 



c- Conocarpus erecta (2340) ) Rhizophora mangle (2336) 



Euphorbia buxifolia (2338) Sesuvium portulacastrum (2323) 



Cf Euphorbia havanensis (2351, 2354, ^ Solanum bahamense (2361) 



2355, 2356) 5f Suriana maritima (2337) 



3 Eustachys petraea (2352) * Tournefortia gnaphalodes (2341) 



6 Flaveria linearis (2331, 2349) I Uniola paniculata (2359) 



/ Waltheria americana (2327) 



Man Key is a narrow sand ridge about one mile long by a quarter 

 mile wide. The southern beach rises abruptly to a bank, about four 

 feet high in its central part, whence it slopes to the west into a narrow 

 strand and to the east to a sea-washed spit. The brink of the 

 plateau is occupied by a Uniola- Euphorbia association with Cakile 

 between it and the water. Back of this association is a new aggrega- 

 tion of Panicum and Cenchrus. The plateau itself is almost covered 

 with Andropogon admixed with scattering plants of Waltheria, Flaveria, 

 Ipomoea, and Melanthera, and a goodly sprinkling of Galactia and 

 Bradburya. 



The extensive and marked zonal arrangement of the Uniola, 

 Panicum, Andropogon, Borrichia, Avicennia, Batis, and Euphorbia is 

 unique upon this key; on none other do the various elements of the 

 flora remain in such pure colonies; nor is there found anywhere else 

 among the keys an area so peculiarly implanted. The next feature 

 of note, beside the remarkable zonal arrangement, is the absence of 

 Laguncularia from the mangrove border, and Cyperus brunneus from 

 the plateau. 



