I 



FLORA OF THE DISTRICT OF COLUMBIA. 99 



Achene smooth; bristles longer than the achene. 



Spikelets whitish or pale brown, in small dense cynrose heads 4. R. alba. 



Spikelets-dark brown. 



Spikelets in dense globose heads 5. R. axillaris. 



Spikelets in broad or narrow cymosc heads. 



Achene ovoid, 1.2 mm. wide, rounded at base 6. R. gracilenta. 



Achene obovoid, 0.8 mm. wide, ■ndth distinct spikelike base. 



Bristles downwardly barbed -.7. R. capitellata. 



Bristles upwardly barbed 7a. R. capitellata controversa. 



1. Rynchospora corniculata (Lam.) A. Gray. 



Wet 8and by the Potomac at Sandy Landing, Maryland, below Great Falls; collected 

 but once. Sept. Coastal Plain, Del. southw^ard. 



2. Rynchospora macrostachya Torr. 



Marshes along the lower part of the Eastern Branch and near Accotink Ci-eek; infre- 

 quent. Aug. -Sept. Atlantic states and occasionally inland. (Included in R. corni- 

 culata in Britt. & Brown, Illustr. Fl.) 



3. Rynchospora cymosa Ell. 



Swales; Kenilwurth and Lakeland. June-July. Southeastern states, north to N. J. 



4. Rynchospora alba (L.) Vahl. 



Open places in magnolia bogs below the fall line; frequent. July-Sept. Through- 

 out the U. S. 

 6. Rynchospora axillaris (Lam.) Britton. 



Among sphagnum in East Ilyattsville Swamp. Aug. -Sept. Atlantic Coastal Plain. 



6. Rynchospora gracilenta A. Gray. 



Bogs below the fall line; small bog east of Brookland. Aug.-Sept. Atlantic 

 Coastal Plain. 



7. Rynchospora capitellata (Michx.) Vahl. 



Swales and wet spots in woods; frequent. Eastern IT. S. {R. glomerata of authors.) 

 7a. Rynchospora capitellata controversa Blake. 



Wet ground; Holmead Swamp; near Aqueduct Bridge. Aug.-Sept. Pa. to Va. 



There is a specimen of R. fusca (L.) Ait., labeled "near Washington, D. C, Dr. 

 Geo. Vasey. " The locality is doubtful. 



12. SCLERIA Berg. Nut rush. 



Achenes smooth, wdiite and shining. 



Culms commonly about 1 meter tall; achene globose 1. S. triglomerata. 



Culms usually not over 50 cm. tall; achene ovate 2. S. oligantha. 



Achenes reticulate or papillose. 

 Achenes reticulate; fascicles of spikelets few to several in a small panicle; axil- 

 lary fascicles slender-peduncled 4. S. reticularis. 



Achenes papillose; fascicles of spikelets few, approximate; axillary fascicles, if pres- 

 ent, subsessile. 



Foliage glabrous 3. S. pauciflora. 



Foliage pubescent 3a. S. pauciflora caroliniana. 



1. Scleria triglomerata Michx. 



Wet sandy woods and swales; Terra Cotta and southeastward, below the fall line; 

 frequent. June. Eastern U. S. 



2. Scleria oligantha Michx. 



Sandy woods; represented by a single collection by Vasey labeled "Washington, 

 D. C, 1874. " The specimen cited by Ward as collected at "Rock Creek above Davis's 

 Quarry, June, 1874 (Dr. Vasey) " can not be found, unless the above specimen lacking 

 data be it. June-Aug. Southern Atlantic Coastal Plain to Tex. 



