Floerkea 



LlMNANTHACEAE 



647 



50 



Map 1344 



Callitriche Austini Enqeln 



" ~To 

 Map 1345 



Callitriche heterophylla Pursh 



Leaves usually of two forms, the submerged ones linear and 1-nerved, the floating 

 ones obovate to broadly spatulate and 3-nerved, all more or less petioled or nar- 

 rowed at the base; flowers usually between two bracts. 

 Fruit about as wide as long, not narrowed at the base, the lobes rounded; stigmas 



spreading, usually twice as long as the fruit 2. C. heterophylla. 



Fruit longer than broad, narrowed at the base, the mature lobes winged toward 

 the apex; stigmas erect, about the length of the fruit. (See excluded species 



no. 424, p. 1071.) C. palustris. 



Leaves all submerged, linear, 1-nerved, not narrowed at the base, sessile; flowers 

 without bracts; fruit with a narrow, deep notch at the apex; stigmas long, re- 

 curving, deciduous. (See excluded species no. 423, p. 1071.) . .C. hermaphroditica. 



1. Callitriche Austini Engelm. (Callitriche deflexa var. Austini (En- 

 gelm.) Hegelm.) Map 1344. Frequent in southern Indiana in woodland 

 along logging roads and in fallow cornfields. It grows only on bare spots 

 in moist, minimacid soil, associated in logging roads usually with Gratiola 

 neglecta and in fields with Poa Chapmaniana, Alopecurus carolinianus, 

 and Arabis virginica. It is so small and inconspicuous that it is usually 

 overlooked. 



Conn, to Ind. and Mo., southw. to Del., La., and Tex. ; also from Mex. 

 to S. A. 



2. Callitriche heterophylla Pursh. Map 1345. Infrequent in ponds and 

 shallow streams, which may become dry during dry seasons, and rarely 

 in inundated woodland. 



Newf. to Man., southw. to Fla., La., Mo., and Colo. 



152. LlMNANTHACEAE Lindl. False Mermaid Family 



4542A. FLOERKEA Willd. 



1. Floerkea prosperpinacoides Willd. Map 1346. Locally abundant in 

 thick woodland in rich, moist soil, usually associated with sugar maple, 

 beech, white oak, and white elm. We have no records for the area south 



