134 PUBLIC HEALTH BULLETIN NO. 286 



MENYANTTTACEAE Bogbean family 



1. Nymphoides [Tourn.] Hill 



1. Leaf-blades thick, pitted beneath; petiole purple-gland- 1. N. aquaticum. 



ular. 

 1. Leaf-blades thin, not pitted beneath; petiole slender 2. N. cordatum, 



and smooth. 



1. N. aquaticum (Walt.) Kuntze. Floating-heart — Range includes 

 all of our Coastal Plain. Most often seen in rather acid and often 

 open ponds. 



2. N. cordatum (Ell.) Fernald — Less common than the preceding in 

 most of our territory, but found in similar situations and with roughly 

 the same range. A'^. lacunosum (Vent.) Kuntze is the name given this 

 species in Small's Manual. 



CONVOLVULACEAE Mommg glory family 

 1. Breweria R. Brown 



B. aquatica (Walt.) A. Gray — Found infrequently around shallow 

 ponds. Range includes all of our Coastal Plain. 



HYDROPHYLLACEAE Waterleaf family 



L Hydrolea L. 



1. Flowers in terminal clusters; styles several times as 2. 



long as ovary, pubescent at base; filaments as long 



or nearly as long as corolla. 



1. Flowers in axillary clusters; styles slightly longer than 3. 



ovary, glabrous; filaments much shorter than corolla. 



2. Leaf-blades ovate to elliptic; calyx lobes less 1. H. ovata. 



than 7 mm. long; flowers paniculate. 

 2. Leaf-blades elliptic to elliptic-lanceolate; calyx 2. H. corymbosa. 

 lobes over 7 mm. long; flowers corymbose. 



3. Stjpal.s linear or linear-lanceolate; stem villous above 3. H. quadrivalvis. 



3. Sepals ovate-lanceolate; stem nearly glabrous above 4. H. affinis. 



1. H. ovata Nutt. — Ponds and swamps, Coastal Plain, Georgia 

 north and west to beyond the limits of our territory. 



2. H. coryinbosa Macbride— -Limited in distribution, Coastal Plain, 

 Florida to South Carolina, mostly in calcareous swamps. 



3. H. quadrivalvis Walt.— Probably the most frequent species of 

 the genus in om- territory. Range includes all of our Coastal Plain, 

 often in acid places. 



4. H. affinis A. Gray — Swampy places, but in our territory only in. 

 its western part in Mississippi. 



VERBENACEAE Verbena family 

 1. Lippia [Houston] L. 



L. lanceolata Michx. Frog-fruit — Found mostly in alluvial situa- 

 tions, over most of our area. L. nodiflora (L.) Michx., a creeping 



