GEOGRAPHY AND VEGETATION OF NORTHERN FLORIDA. 403 



O.I Morus rubra L. Mulberry. 



Rich woods and low hammocks in calcareous regions. 

 o Ulmus alata Mx. Elm. 



Rich woods, especially in calcareous soils; rare. 

 0.1 Ulmus Floridana Chapm. Elm. 



Calcareous bottoms, low hammocks, etc., especially in Gulf hammock region, 

 o Ulmus Americana L. ? Elm, 



Along Chipola and Apalachicola Rivers, 

 o Ulmus fulva Mx. Slippery elm. 



Rich calcareous woods in regions i and 3; very rare. . 

 O.I Plancra aquatica (Walt.) Gmel. 



Along Apalachicola and Suwannee Rivers, and in a few other places where 



the water fluctuates several feet during the year 

 0.1 Celtis occidentalis L. ? Hackbekky. (Perhaps more than one species.) 



River-bottoms, rich hammocks, etc. 

 1,8 Magnolia grandiflora L. Magnolia. (Occasionally called loblolly.) 



A characteristic tree of hammocks, in every region. 

 3.0 Magnolia glauca L. (White) bay. 



Bays and non-alluvial swamps, in every region except the last. 

 ? Magnolia macrophylla Mx. Cucumber tree. 



Rich woods in Knox Hill country and Holmes Valley. 

 ? Magnolia pyramidata Pursh. Cucumber tree. ^ 



With the preceding, but rarer. 

 0.5 Liriodendron Tulipifera L. Poplar. 



Branch-swamps and wet woods, mostly northward.* 

 2.4 Liquidambar Styraciflua L. •Sweet gum. (Red gum of the lumber trade.) 



In various situations, nearly throughout; apparently preferring somewhat 



phosphatic soils. 

 0.1 Platanus occidentalis L. Sycamore. 



Banks of Apalachicola River, in regions 2, 3 and^ 9. 

 0.1 Malus angustifolia (Ait.) Mx. Crab-apple. 



Moderately rich uplands, west of Suwannee River. 

 ? Amelanchier Canadensis (L.) Med.? 



Rich woods in West Florida; rare. 

 ? Crataegus apiifolia (Marsh.) Mx. (Parsley haw^.) 



Bottoms, low hammocks, etc.; not common. 

 ? Crataegus spathulata Mx. 



Bluffs of upper Apalachicola River. 

 ? Crataegus aestivalis (Walt.) T. & G. May haw. 



Suwannee River bottoms, and shallow ponds in clayey soil westward. 

 0.1 Crataegus viridis L. Haw. 



Bottoms and sloughs, mostly in regions 2 and 15. (This is the largest of 



our haws, but it is never more than a medium-sized tree.) 



*About two years ago Prof. P. H. Rolfs found this tree being cut for lum- 

 ber in tlie southwestern part of Putnam County, which was farther south than it 

 had previously been known to grow. (See Torreya 13:69. 1913.) On July 9, 

 1914, the writer passed through the same section on the Ocala Northern R. R. 

 and saw enough of this tree to warrant its inclusion in the list of plants for the 

 peninsular lake region (page 322). 



