CYPERACEAE 



I69 



9. Hemicarpa Nees & Arn. 



H. micrantha (Vahl) Pax. In moist sandy soil: N. H. to 

 Ont., Wash., Fla., Tex., Mex. and S. Am. 

 Conn. Rare, but scattered over most of the state, perhaps wanting 



northward. 

 N. Y. Rare and local on L. I. and in West Chester Co. 

 N. J. Rare in Hunterdon and Camden counties near the Delaware, 



unknown elsewhere. 



A rare and local species whose distribution is not yet understood. 



10. Dulichium L. C. Rich. 



D. arundinaceum (L.) Britton (D. spathaceum Pers.). In wet 

 places: Newf. to Ont., Minn., Wash., Fla. and Tex. Also 

 in Costa Rica. 



Common throughout the range. 



11. Rynchospora Vahl. 



Style entire or 2-toothed, persistent as a long-exserted subulate 



beak. 

 Style deeply 2-cleft, only its base persistent as a tubercle. 

 Bristles minute or wanting. 

 Bristles plumose. 



Bristles downwardly barbed or rarely smooth. 

 Scales white or nearly so; bristles 9-15. 

 Scales brown; bristles 6. 



Leaves filiform; achene oblong. 



Leaves narrowly linear, flat; achene obovate. 



Bristles equalling the achene; tubercle 3^ as 



long or leso. 

 Bristles reaching or exceeding the end of the 

 tubercle, which is as long as the achene. 

 Spikelets few-several in numerous rather 



loose clusters. 

 Spikelets very numerous in 2-6 very dense 

 globose heads. 

 Bristles upwardly barbed. 



Spikelets numerous in 2-6 very dense globose heads. 

 Spikelets few-several in rather loose clusters. 

 Achene smooth. 



Leaves setaceous; achene obovate shining. 

 Tubercle triangular-subulate. 

 Tubercle flat, ciliate, triangular. 

 Leaves narrowly linear. 

 Achene broadly oval. 

 Achene narrowly obovate. 



1. R. corniculata. 



2. R. pallida. 



3. R. oligantha. 



4. R. alba. 



5. R. capillacea. 



6. R. Knieskernii. 



7. R. glomerata. 



8. R. axillaris. 

 8. R. axillaris. 



9. R. fusca. 



10. R. ftlifolia. 



11. R. gracilenta. 



12. R. Smallii. 



