568 CLX. CYPERACEiE. Fuirena. 



terior glumes ; stamens 3 ; style 3-cleft ; achenium triangular. — '4- 

 Habit of Cyperus. 



1. M. ovuLARis. Vahl. (Cvperus. Gron. Torr. Scirpus echinatus. LmTt.) 

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



nearly smooth ; umbel simple; rays "6" — 2' long; hds. 1 — 5, globose, 1 sessile, 

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

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

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



8. tenellus. Torr. Slender and caespitose ; hds. ovate, small. 



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



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



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

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

 unequal, long, 6—8; i7ivol. 3— 5-leaved; bracts unequal, not longer than the 

 rays; spikclets 70—100, subulate, 1-flowered, finally re trorsely imbricate into 

 obovate heads ; 2 l(ni:er glumes empty.— A rare species. Middle and Western 

 States. Aug., Sept. 



4. KYLLINGIA. 



In lionor 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. — Stems triangular. Hds. ses- 

 sile^ solitary/ or aggregated^ involucrate. 



1. K. puMiLA. Michx. 



Ceespitose ; 5^. 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; spikclets 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. (»S'Ao?-^) and 

 Southern States. 



2. K. MONOCEPHALA, 



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

 \" wide; hd. simple, globose, dense, inclining; invol. 3-leaved, the highest 

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

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



Tribe 2. HYPOLYTREJE. 



5. FUIRENA. Rottboll. 



In honor of George Fuiren, a Dutch botanist. 



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

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

 St. angular.^ leafy. Spikes subumbcled, 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 ; 

 av:ns 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.) 



St. pubescent above, 3 — G' high; /r-?. linear-lanceolate, flat, striate, as 

 long as the stem ; sjnJ^es 1, 2 or 3, thick, subtended by 2 — 3 long, involucrate, 

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

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



