112 PXTBLIC HEALTH BULLETIN NO. 2 86 



ORCHID ACEAE Orchid famUy 

 1. Habenaria Willd. 



H. repens Nutt. — Acid swamps and ponds, Coastal Plain, Florida 

 to North Carolina and westward. 



PIPERACEAE Pepper family 

 1. Saururus L. 



S. cemuus L. Lizards-tail — This emergent plant is well distributed 

 over all of our area. Its habitat is very variable, but it is frequently 

 found in truly aquatic areas. It shows a wide acidity tolerance and 

 is found in acid and alkaline regions alike. It is very often found in 

 association with Anopheles quadrimaculatus and in some instances 

 constitutes a major problem. 



JUGLAND ACEAE Wahiut family 

 1. Carya Nutt. 



C. aquatica (Michx. f .) Nutt. Swamp Hickory — River-swamps and 

 river-bottoms mostly in the Coastal Plain, Florida north and west to 

 the limits of our territory. 



MYRICACEAE Bayberry family 



1. Myrica L. 



1. Fruit 2-3 mm. in diameter; leaves long-attenuate to the 1. M. cerifera. 



base, acute at apex. 

 1. Fruit 3.5-4 mm. in diameter; leaves not long-attenu<ate 2. M. caroUnensis. 



to base, apex obtuse. 



1. M. cerifera L. Wax Myrtle — Occasionally in swamps but is 

 more frequently in non-aquatic situations over all of our Coastal 

 Plain territory. 



2. M. carolinensis Mill. Bayberry — Acid swamps and other non- 

 aquatic situations over most of our Coastal Plain territory. 



SALICACEAE Willow family 



1. Salix [Tourn.] L. 



1. Leaves closely and finely toothed 2. 



1. Leaves with remote teeth 1. S. interior. 



2. Leaves green beneath 2. S. nigra. 



2. Leaves glaucous or sU very-white beneath 3. 



3. Twigs brittle-jointed 3. S. harbisonii. 



3. Twigs not brittle-jointed 4. S. longipes. 



1. S. interior Rowlee. Sandbar Willow — Alluvial areas in the 

 Mississippi Valley, aquatic mostly during periods of high water. 



