5(aj CLX. CYVERACEM. Fvitshsj 



terior glumes ; stamens 3 ; style 3-cleft ; achenium triangular. — % 

 Habit ^ Cyperus. 



1. M. ovuLARis. Vahl. (Cyperus. Gron.Torr. Scirpnsechinatus. Z, ww.) 

 St. triquetrous, nearly naked, 1 — 2f high ; Ivs. shorter than the : lera^ 



nearly smooth ; umhd simple; raijsZ" — 2' long; hds. 1 — 5, globose, 1 se sile, 

 the rest on the spreading rays ; spikelets linear-subulate, 6" long, 50 — 11 in 

 each head; fls. S — 4, 1— 2iertile ; invol. 3 — 4-leaved, outer leaves very lo g. — 

 Bogs and low grounds, Middle and V/estern States, common. Aug., Sep . 



B. tencllus. Torr. Slender and csespitose ; hds. ovate, small. 



y. cyli/ndriciis. Torr. Hds. oblong, cylindrical. 



2. M. RETROFACTDS. Vahl. (Scirpus. Linn.) 



St. obtusely triangular, nearly leafless, pubescent, 2 — 3f high ; Ivs pu- 

 bescent, 3 — 4" wide, about half as long as the stem ; umbels simple ; rays 

 unequal, long, 6 — 8; invol. 3 — 5-leaved; bracts unequal, not longer tha:'. the 

 rays; spikelets 70 — 100, subulate, 1-flowered, finally retrorsely imbricate inta 

 obovate heads ; 2 loiver glumes empty. — A rare species, Middle and We itera 

 States. Aug., Sept. 



4. KYLLINGIA. 



In honor of Peter Kylling, a Danish botanist. 



Spikelets compressed ; scales about 4, the two lowest short and 

 empty, the third only usually with a fertile flower ; stam. 1 — 3 j 

 style long, 2-cleft ; achenia lenticular. — Stems triangular. Hdi. ses^ 

 sile, solitary or aggregated., involucrate. 



1. K. puMiLA. Michx. 



Csespitose ; U. 2 — 12' high, slender; Ivs. mostly radical, shorter iha;i the 

 stem, smooth; hds. generally solitary, sometimes triple, closely sessile, oval op 

 oblong; invol. 3-leaved, 1 — 2' long: spikelets 1-flowered, very numerous, cbout 

 2" long; the lowest glume or glumes very small ; sta. always 2; acL lens- 

 shaped, fulvous. — Wet banks, Columbus, Ohio {Sidlivanl .') Ky. (^ShoH , ana 

 Southern States. 



2. K. MONOCEPHALA. 



St. slender, 10 — 15' high, leafy at base ; Ivs^. much shwter than the stem^ 

 1" wide; hd. simple, globose, dense, Inclining; invul. 3-leaved, the highest 

 leaflet erect; spikelets numerous, 1-flowered; two lov/er glumes minute, two 

 upper striate, subequal, serrulate, ciliate on the keel. — Mass., IN. Y. to Ga, 



Tribe 2. HYPOLYTRE^, 



5. FUIRENA. Rottbdll. 



In honor of George Fuiren, a Dutch botanist. 



Glumes awned, imbricated on all sides into a spike ; petnloiel 

 scales 3, cordate, awned, unguiculate, investing the achenium. — % 

 St. angular, leafy. Spikes subunibelcd, axillary and terminal. 



1. P. sauARRosA. Michx. 



St. 1 — 2f high, obtusely triangular, .sulcate ; fes. ciliate, shorter than the 

 stem ; sheaths hispid-pilose ; spikes clustered, ovate, mostly terminal, 8 — 12 j 

 awns nearly as long as the glumes ; pctaloid scales ovate, cuspidate with a short 

 bristle ; oxh. twice the length of the stipe. — Bogs and swamps, N, J. to Car. 

 Sept. 



2. F. fumIla. Spr. (F. squarrosa. (i. Torr.) 



Sf. pubescent above, 3 — G' high ; Irs. linear-lanceolate, flat, striate, as 

 long as the stem ; spikes 1, 2 or 3, thick, subtended by 2 — 3 long, iavolu::rate^, 

 unequal leaves ; glumes ovate-lanceolate, with short avms ; petaloid scales ovatCr 

 lanceolate ; ach. pedicellate, with retrorsely hispid setse. Wet, sandy places. Aug;. 



