capillary-setaceus; inflorescence of a terminal 6- to 12- (to 20-) spikeletted 

 lax subumbelliform unit 1-3 cm. broad, the individual capillary pedicels 3-12 mm. 

 long; spikelets narrowly ovoid, subacute, pale-cinnamon-brown, 3-4 mm. long, 

 with 2 to 4 flowers and maturing 1 to 3 fruits: bristles 6, shorter than the achenial 

 body, minutely antrorsely serrulate; achenial body broadly obovate, 1.1-1.4 mm. 

 long, biconvex, pale-brown, the 2 faces with strong transverse ridges, tubercle 

 deltoid, compressed, 0.3-0.6 mm. long. 



Rare in bogs or piny crayfish-land, savannahs, e. and s.e. Tex. (Austin, Harris, 

 Henderson, Anderson, Tyler, Leon, Orange and Waller cos.) May-June; coastal 

 areas, N.J. to Tex.; also Tenn., Gr. Ant. and C.A. 



18. Rhynchospora inexpansa (Michx.) Vahl. 



Tufted perennial; culms 5-8 dm. long, erect (or terminally drooping), wiry, 

 1.5-2 mm. thick near the base; leaves mostly basal, with long tough somewhat 

 curly blades; inflorescence fairly narrow, elongate and drooping; spikelets lanceo- 

 late, brown, 4.5-6 mm. long, with 2 to 5 flowers, setting 1 to 4 fruits; bristles 

 about 6, surpassing the tubercle, minutely antrorsely serrulate; achenial body 

 elliptic-obovate, 2-2.2 mm. long, 0.8-1 mm. broad, much-compressed, the 2 flat 

 faces transversely rigid; tubercle deltoid, 0.9-1.2 mm. long. 



Locally frequent in open pinelands, swamps, ditches, marches, in ponds, 

 savannahs and pineland bogs, e. and s.e. Tex. (Angelina, Hardin, Jasper, Jefferson 

 and Liberty cos.), summer; Coastal States, Va. to Tex.; also Ark. and (?) Okla. 



19. Rhynchospora mixta Small. Fig. 250. 



Rhizomatous perennial; culms about 1 m. long, about 2 mm. or more thick 

 basally, leafy, erect or ascending (flexuous in the distal floriferous portion); 

 blades 3-4 mm. broad; inflorescence decomposed, open, the terminal portion 

 3-4 cm. broad, very lax, of about 25 spikelets, some of the ultimate glomerules 

 on long spreading arculate-erect peduncles 10-15 mm. long; spikelets narrowly 

 ovoid, 4-6 mm. long, brown, with 2 or more (rarely as many as 10) flowers, 

 1 (rarely as many as 10) fruit produced; bristles about 6, surpassing the tubercle, 

 upwardly minutely barbed; achenial body narrowly obovate, 1.3-1.4 mm. long, 

 0.8-0.9 mm. broad, turgidly biconvex, with very numerous faint transverse lines; 

 tubercle deltoid-attenuate, 0.4-0.9 mm. long, compressed. 



Rare in sandy forested areas near streams, e. Tex. (Nacogdoches Co.), summer; 

 near the cost, N.C. to s.e. La.; Tex. 



20. Rhynchospora Elliottii A. Dietr. 



Tufted perennial; culms 8-15 dm. long, 2.5-5 mm. thick basally, erect except 

 slightly nodding distaliy; leaf blades 4-5 mm. wide basally, mostly long-tapered, 

 strictly erect and appressed; inflorescence of 2 to 5 dense decomposed separate 

 portions, the terminal portion irregularly corymbiform, 2-6 cm. broad, of 150 to 

 300 spikelets; spikelets ovoid, rich-dark-brown, 2.5-3.2 mm. long, with 3 to 6 

 flowers and setting 2 to 4 fruits; bristles 6, surpassing the tubercle, minutely 

 antrorsely serrulate, not closely appressed to the achene but slightly spreading 

 basally and arcuate-erect; achenial body obovate, tawny-brown, 1.2-1.3 mm. long, 

 0.9-1.1 mm. broad, with very pronounced traverse ridges on the 2 nearly flat 

 faces; tubercle deltoid, 0.3-0.4 mm. long. R. schoenoides (Ell.) Wood, an illegit. 

 name. 



Frequent in moist or wet sand in savannahs, in e. and s.e. Tex., summer; near 

 the coast, N.C. to Tex. (except Fla.) 



21. Rhynchospora microcarpa Gray. Fig. 251. 



Tufted perennial; culms 5-8 dm. long, 2-3 mm. thick basally, erect; leaves 

 mostly appressed or curly, 2-3 mm. broad basally; inflorescence in (1 or) 2 to 4 



484 



