COMMELINACEAE 75 



Famii^y 2. ERIOCAULACEAE Lindl. Pipewort Family. 



1. BRIOCAULON L. 



Sheath at the base of the scape longer than the leaves or about as long : scapes 

 usually 7-ridged. i. E. septangulare. 



Sheath at the base of the scape shorter than the leaves : scape io-14-ridged. 



2. E. decangulare. 



1. Eriocaulon septangulare With. Seven- angi^ed Pipewort. 

 (Man. p. 237; I. F. /. 8gg.) In still water and on shores, Newf. to 

 Minn., south to Fla. and Tex. — Pennsylvania . Carbon ; Monroe ; 

 Lackawanna ; Luzerne ; Phii^adelhia ; Susquehanna. 



2. Eriocaulon decangulare L. Ten-anglEd Pipewort. (Man. p. 

 237 ; I. F. f. goi. ) In swamps, N. J. and Pa. to Fla. and Tex. — Penn- 

 sylvania : According to Britton, Man. p. 237. 



Family 3. COMMELINACEAE Reichenb. Spiderwort Family. 



Petals alike in shape : perfect stamens 6 or rarely 5. i. Tradescantia. 



Petals unequal in size and shape : perfect stamens 3 or rarely 2. 



2. COMMELINA. 



1. TRADESCANTIA L. 



Leaf-blades linear or linear-lanceolate, 12-50 times longer than wide, more or 

 less in volutely folded. i. T. Virginiana. 



Leaf-blades lanceolate, 5-10 times longer than broad, flat. 2. T. pilosa. 



1. Tradescantia Virginiana L. SpidERWOrT. (Man. p. 241 ; I. F. f. 

 910.) In rich soil, mostly in woods, N. Y. to Ohio and S. Dak., Va. and 

 Ark. — Pennsylvania : Delaware ; Lancaster ; Franklin ; Bucks ; 

 Chester ; Delaware ; Allegheny. 



2. Tradescantia pilosa J. G. C. Lehm. Zigzag Spiderwort. (Man. 

 p. 242; I. F. y. p/j.) Pa. to Mo. and Fla. — Pennsylvania: Phila- 

 delphia, Bartram's Garden. 



2. COMMELINA L. 



Spathes not united at the base. 

 Spathes acuminate : capsules 3-celled, 5-seeded. 1. C. nudiflora. 



Spathes acute : capsules 2-celled, 4-seeded. 2. C. communis 



Spathes with the bases united. 

 All three cavities of the ovary with 2 ovules. 

 Capsule 2-valved, the dorsal cavity indehiscent. 3. C. Virginica. 



Capsule 3-valved, all the cavities dehiscent. 4. C. erecta. 



Ventral cavities of the ovary with 2 ovules, dorsal cavity with i ovule. 



5. C. hirtella. 



1. Commelina nudiflora L. Creeping Day-flower. (Man. p. 239 ; 

 I. F. f. 90s.) Along streams and in waste places, N. J. to Mo., Fla., Tex. 

 and through tropical Am. to Paraguay. — Pennsylvania : Chester ; Del- 

 aware, Tinicum. 



2. Commelina communis L. Asiatic Day-flower. (Man. p. 240; 

 I. F. _/! 907.) N. Y. and Pa. Adv. or nat. from Asia. — Pennsylvania: 

 Northampton ; Bucks ; Dauphin, Harrisburg ; Perry ; Lancaster 

 Beavkr. 



