286 MONOCOTYLODENOUS. 



qual, sheathed at the base. Spike cylindrical. Glumes nearly orbicular, 

 with ferruginous margins. Bristles 3, setaceous. 

 % April— May. In swamps. 1-2 ft. 



9 S Eqijisetoides. ^tem erect, terete, glabrous, jointed, sheathed art the 

 base. Spikes cylindrical. Glumen obtuse, tinged with purple. 



%. June — July. Damp soils. 18-24 in. 



(6' Spikes numerous. Stems without leaves. 



10 S Debilis. Stem erect, triangular, glabrous, sheathed at the base. — 

 Spikes 3, ovate. Involucre Ions, erect. Glumes mucronate, ovate, membra- 

 nous. 



% Aug.— Sept. Upper dis. Car. & Ga. 12-f8 in. 



lis Americanus. Stem erect, triangular, glabrous, sheathed at the base. 

 Spikes 6-8, ovate, sessile. Glumes ferruginous, ovate. Bristles pilose. 

 % Through the summer. Very connnon. 2-3 ft. 



12 S Lacustris. Stem erect, stout, glabrous, striate. Spikes numerous, 

 forming an umbel. /raioZwcre 2-leaved, unequal. GZuwies lanceolate, ciliate. 

 Bristles 6, retrorsely aculeate. 



(c) Spikes numerous. Stem leafy at the base, 



13 S AuTur.iNALis S^ew erect, compressed. Zeaws linear, flat. Sheath 

 bearded at the throat. Spikes lanceolate, in compound umbels. Glumes 

 lanceolate. 



Cv) Aug — Oct. Damp soils, very common.- 8-12 in. 



14 S CiLiATiFOLius. Stem slender, striate. Leaves linear, channeled, 

 ciliate. Spikes ovate, in compound umbels, with a short involucre. Glumes 

 lanceolate. 



^ Sept.— Oct. Damp soils, • 6-8 in. 



15 S Stexophyllus. Ste7n filiform, obtusely 3-angied, erect and pro" 

 cumbent. Leaves setaceous, with the throat of the sheath hairy. Spikes 

 clustered, se.vsiie. Involucre 4-Ieaved, v»ith the leaves unequal. Flowers 

 monandrous. 



# July — Sept. Dry soils. 3-4 in. 



16 S CoARCTATUS. Stem filiform, generally declining. Leaves glabrous, 

 v/ith the throat of the sheath bearded. Spikes- in a compound umbel. Invo- 

 lucre many leaved, setaceous, one of the leaves longer than the rest. Glumes 

 ferruginous, ciliate. 



© Sept.— Oct. Dry soils. 10-12 m. 



17 S Castaneus. <S/em erect, striate. Zeoves narrow, erect, rigid. Spikes 

 ovate, in a terminal compound umbel. Involucre 2-leaved. Glumes 

 nearly round. 



June — July. Low coi.iitry. 



18 S Spadiceus. Sfe7ns f rmingathick tuft. Leaves long, narrow, ar- 

 ranged in two rows. S/ .''•.r.- in compound umbels, with the sessile one in 

 the division of tb.e stem. I .i^slucre subulate. Glumes nearly orbicular, gla- 

 brous. 



June— Oct. On the sea coast. 2-3 ft. 



19 S Ferrugineus. Stem '^rect, compressed, with the angles at the sum- 

 mit scabrous. Leaves coriaceous, with cartilaginous margin?. Throitof the 

 sheath ciliate. Spikes in compound umbels, with the sessile one in the divis- 

 ion of the stem. Involucre ciliate. Glumes coriaceous, ferruginous, pubes- 

 cent and ciliate. 



% .lune — Oct. In moist places. 1-3 ft. 



20 S Sulcatus. Stem erect, glahu'ous, terete. Leaves glabrous serrulate. 

 Spikes ovate-lanceolate, in compound umbels. Involucre subulate, small. 

 Glumes membranaceou?^. 



Aug. — Sept. Damp soils. 12-15 in. 



(d) Spikes numerous. Stems leafy. 



21 S Maritimus. S<e/ra erect, 3-angled. Leatvs very long, glabrous, chan- 



