Eriocaulon 



Eriocaulaceae 



283 



suggests that it may have been more frequent than our reports indicate 

 because the plant is so inconspicuous. 



In the Coastal Plain states from Maine to Fla. and La. ; also in n. Ind. 

 and s. Mich. 



30. ERIOCAULACEAE Lindl. Pipewort Family 

 828. ERIOCAULON [Gronov.] L. 

 1. Eriocaulon septangulare With. (Eriocaulon articulatum (Huds.) 

 Morong.) (Rhodora 11: 40-41. 1909.) Map 588. Local but common where 

 found, in shallow water on the borders of lakes, usually in marly soil. 

 Newf. to Minn., southw. to N. J. and Ind. 



33. COMMELINACEAE Reichenb. Spiderwort Family 

 Petals unequal; perfect stamens 3; filaments naked; bracts spathelike 



896. Commelina, p. 283. 



Petals equal; perfect stamens 6; filaments bearded; bracts leaf like or small and 



scarious 911. Tradescantia, p. 285. 



896. COMMELINA [Plum.] L. Dayflower 



[Pennell. The genus Commelina [Plum.] L. in the United States. Bull. 

 Torrey Bot. Club 43: 96-111. 1916.] 



The species of this genus have not been understood, hence most of our 

 records are of uncertain identity. I do not attempt to give the synonomy of 

 all of our species. 



Spathelike involucre open at the base, the edges not united, ciliate or minutely rough- 

 ened; leaves mostly of a lanceolate or ovate-lanceolate type, 4-8 cm long. 

 Two posterior petals blue; anterior petal much smaller, narrow, white; capsules 

 2-celled; seed 2 in each cell; plants usually much branched; top of leaf sheath 



without long, rusty hairs 1. C. communis. 



All three petals blue, the anterior one much smaller; capsules 3-celled, one cell 



1-seeded and indehiscent; seed 5 2. C. diffusa. 



Spathelike involucre with the edges united at the base, the margins smooth; leaves of 

 a linear-lanceolate or lanceolate type, or very wide (2-5 cm) and of a lanceo- 

 late or elliptic type. 



