196 Monograph of North Am^'rican Rhynefiosporce. 



(as in R. laxa and jR. macrostachyd) with the whole style in- 

 durated and persistent. 



Seed ovate or globose, not adhering to the pericarp. 



* Nut rugose. 

 1. Rhynchospora cymosa, Nutt. 



R. culmo triquetro ; corymbis subcymosis, terminalibus axilla- 

 ribusque ; spiculis ovatis, glomeratis ; nuce orbiculato-obo- 

 vata, subcompressa, transversim undulato-rugulosa, setis sur- 

 sum hispidulis longiori ; tuberculo brevi conico. 



R. cymosa, Nutt. Gen. I. p. 33. Rmm. et Schult. Mant. II. p. 

 47. Torrey, Fl. I. p. 56. (excl. syn. Elliott and Pursh). 



Schoenus cymosus, Willd. Sp. PI. 1. p. 265. Muhl. ! Gram. 

 p. 9. 



Culm 1 — 2 feet high, smooth, acutely triangular. Leaves 2 — 3 lines 

 wide, glabrous ; the radical ones somewhat crowded, the upper cauline 

 ones often overtopping the culm. Sheathes striate. Corymbs 3 — 4, 

 somewhat densely flowered ; the terminal ones largest, the lateral 

 ones on short, exsert peduncles. Spikelets aggregate in fives {in 

 threes, Willd.) on the ultimate division of the corymbs. Glumes fus- 

 cous ; the inferior ones sub-orbicular, emarginate, mucronate ; the 

 interior ones ovate. Bristles 6, a little more than one half the length 

 of the nut, slightly hispid upward. Stamens 3. Style bifid. Nut* 

 a line in length, compressed or somewhat tumid. Tubercle (the per- 

 sistent base of the style) depressed conic, about one-fourth the length 

 of the nut. 



Hab. New Jersey to Louisiana ; July — August. Near Prince- 

 ton, New Jersey, Torrey ; Pamunkey, Maryland, Br. Rob- 

 hins; Charleston, S. Carolina, B. D. Greene, Esq.; Georgia, 

 Le Conte; New Orleans, Dr. Ingalls ; Middle Florida, 

 Dr. Chapman. 



* When the nut is compared with any other part, or its length referr- 

 ed to, the tubercle is always excluded. 



