56y CLX. CYPERACE^. Fuirena. 



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

 Habit rf Cyperus. 



1. M. ovuLARis. Vahl. (Cyperus. Gron.Turr. Scirpus echinatus. imTi.) 

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



nearly smooth ; imbd simple; rai/s 3"— 2' long; Ms. 1—5, globose, 1 sessile, 

 the rest on the spreading ravs ; spikelets linear-subulate, 6" long, 50—100 in 

 each head ; fls. 2—4, 1—2 fertile ; invol. 3 — 4-leaved, outer leaves very long.— 

 Bogs and low grounds, Middle and Western States, common. Aug., Sept. 



B. te?iellus. T orr. Slender and csespitose ; hds. ovate, small. 



y. cylindricus. Torr. Hds. oblong, cylindrical. 



2. M. RETROFACTUs. 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; bmcis unequal, not longer than the 

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

 obovate heads ; 2 linver glumes empty. — A rare species. Middle and Western 

 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 ; 

 style long, 2-cleft ; achenia lenticular. — Steins triangular. Hds. ses- 

 sile., solitary or aggregated.^ involucrate. 



l.K. puMiLA. Michx. 



Csespitose ; st. 2 — 12' high, slender ; Ivs. mostly radical, shorter than the 

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

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

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

 shaped, fulvous. — Wet banks, Columbus, Ohio (Sullivant!) Ky. (Short) and 

 Southern States. 



2. K. MONOCEPHALA. 



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

 1" wide; Ad. simple, globose, dense, inclining; invol. 3-leaved, the highest 

 leaflet erect; spikelets ntunerous, 1-flowered; two lower glumes minute, two 

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



Tribe 2. HYPOLYTRE^. 

 5. FUIRENA. Rottball. 



In honor of George Fuiren, a Dutch botanist. 



Glumes awned, imbricated on all sides into a spike ; pet.aloid 

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

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



1. F. sauARRosA. Michx. 



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

 stem ; sheaths hispid-pilose ; spikes clustered, ovate, mostly terminal, 6 — 12 ; 

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

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

 Sept. 



2. F. PUMILA. Spr. (F. squarrosa. /?. Torr.) 



SI. pubescent above, 3 — 6' high; Ivs. linear-lanceolate, flat, striate, as 

 long as the stem ; spikes 1, 2 or 3, thick, subtended by 2 — 3 long, involucrate, 

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

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



