88 American Midland Naturalist Monograph No. 2 



26. Eriocaulaceae Lindl. — Pipewort Family 



1. Eriocaulon L. — Pipewort 



E. septangulare With. Borders of ponds and lakes. Pepoon says ". . . 

 from East Chicago eastward." Locally abundant in northern Indiana, but no 

 Illinois specimens seen. 



27. Xyridaceae Lindl. — Yellow-eyed Grass Family 

 L Xyris L. — Yellow-eyed Grass 



X. torta Sm. Moist sandy soil, not common. July-Aug. [X. flexuosa of 

 auth., not Muhl.] 



28. Commelinaceae Reichenb. — Spiderwort Family 



1 . Petals equal; perfect stamens 6; filaments pubescent 1. Tradescaniia 



I. Petals more or less unequal; perfect stamens 3; filaments glabrous 2. Cornmelina 



I. Tradescantia L. — Spiderwort 



L Leaves lanceolate, L5-5 cm. broad, not glaucous; margins ciliolate; sepals 

 sparsely pilose or glabrous; cymes axillary and terminal; stems 40-80 cm. 

 tall; woods, common in the central and s. part of the state. June-Aug. [T. 



pilosa Lehm.} T. subaspera Ker 



L Leaves linear or linear-lanceolate; cymes terminal. 



2. Leaves glaucous; sepals glabrous, or pilose at the tip; petals 12-16 mm. 

 long; stems usually 40-90 cm. tall; prairies, roadsides, open woods, 

 common. May-Sept. [T. reflexa Raf.} T. canaliculcita Raf. 



2. Leaves not glaucous; petals 16-20 mm. long; stem 10-30 cm. tall. 



3. Sepals and pedicels pubescent with non-glandular hairs; petals blue; 



meadows, open woods, and thickets, common. May-June 



T. virginiana L. 



3. Sepals and pedicels copiously glandular-villous; petals rose; meadows, 

 thickets, roadsides, not common; w. 111. June T. hracteata Small 



2. Commelina L. — Dayflower 



1. Plants perennial, native; stems erect or nearly so, not decumbent and root- 

 ing at the nodes; margins of the spathe connate at base; seeds smooth, 

 farinose. 

 2. Leaves lanceolate; sheaths ciliate with long, ferruginous hairs; all three 

 petals blue; wet woods, rare, s. 111. Union Co., Seymour in 1880. Aug.- 



Sept C virghiica L. 



2. Leaves linear-lanceolate; sheaths not ferruginous-ciliate; two posterior 

 petals blue, the anterior stnall, white; sandy soil, chiefly in w. 111. July- 

 Sept. [C. virginica of auth., not L.; C. crispa Woot.} C. crccta L. 



1. Plants annual, nat. from e. Asia; stems decumbent, often rooting at the 

 lower nodes; margins of spathe not united; two posterior petals blue, the 

 anterior small, white; leaves lanceolate; moist shaded ground, not uncom- 

 mon. July-Oct C. communis L. 



