PUANTS OF SOUTHERN NEW JERSEY. 249 



cc. Lower spikelets always reflexed, forming a dense ovoid head, no 

 root tubers. C. laincastriensis, p. 253 



aaa. Spikeletg in several peduncled dense umbels or short spikes (cylindrical, 

 ovoid or top-shaped), not over 15 mm. long (exclusive of reflexed spike- 

 lets). Spikelets less than 1.5 mm. in width, or else scales spreading and 

 not closely imbricate. and main umbel sessile, with or without secondary 

 pedicelled umbels. 

 6. Spikelets linear, appressed, more or less terete, prevailing color 

 brownish. 

 c. Umbels globular ovoid or cylindrical, spikelets not bristly 

 pointed, only the basal ones reflexed. 

 d. Head globular or ovoid. C. ovularis, p. 254 



dd. Head cylindrical. C. cylindricus, p. 255 



cc. Umbels ovoid or top-shaped, spikelets bristly pointed, mostly 

 reflexed. 



d. Umbels ovoid, long. C. lancastriensis, p. 253 



dd. Umbels top-shaped, 10-25 mm. long, all spikelets reflexed. 

 e. Culms glabrous. C. hystricinus, p. 253 



ee. Culms scabrous above. 



f. Heads obovoid, contracted at base. 



C. retrofractus, p. 254 

 ff. Heads cylindric or subcylindric. 



C. dipsaciformis, p. 254 

 bb. Spikelets broader, scales loosely arranged, prevailing color green. 

 c. Rachis of spikelet winged, secondary pedicelled umbels always 

 present. C. grayi, p. 255 



cc. Rachis of spikelet not winged. 

 d. Secondary umbels often lacking. 



e. Spikelets 10-16 mm. long, 8-12 flowered. 



C. AUculmis, p. 256 

 ee. Spikelets 3-8 mm. long, 4-8 flowered. 



C. f. macilentus, p. 256 



aaaa. Spikelets as broad as long (3-6 mm.)., sessile in compact heads in large 



compound umbels, forming a mass of inflorescence .$-.7 dm. in diameter. 



C. pseudovegetusi, p. 251 



Cyperus flavescens L. Yellow Sedge. 

 PI. XVI., Fig. 9. 

 Cyperus flavescens Linnaeus, Sp. PI. 46. 1753 [Germany, Switzerland and 

 France.] — Knieskern 33. — Willis 67. — Britton 260. — Keller and Brown 58. 



Damp ground, common in our region, except in the Pine 

 Barrens, casual in North Jersey. 



Fr. — Early August to early October. 



Middle District.— Good Luck Pt. (C), New Egypt, Burlington, Kaighns Pt., 

 Westville, Washington Park (S), Mickletdn (NB), Swedesboro (KB), 

 Jericho. 



Pine Barrens. — Lakehurst, Chatsworth, Clenlenton, Hammonton, Atsion, 

 Mays Landing (C), Pleasant Mills. 



