SEDGE FAMILY 107 



obovoid, faintly reticulate; tubercle thick, deltoid. Perha]xs not distinct from 

 E. moidana H.B.K. Sandy shores: S.C. — Fla. — Tex. — Calif. — Colo. Son. — - 



Suhmont, 



10. E. rostellata Torr. Stems slender, flattened, the sterile ones often re- 

 clining and rooting at the summit, grooved; spikelets oblong, G-12 mm. long, 

 2 mm. thick; glumes ovate, obtuse, or the upper acute, green with a darker mid- 

 vein; bristles 4-8, longer than the achoncs; achenes obovoid, finely reticulate. 

 Marshes and wet meadows: N.H. — -Fla. — Tex. — Calif. — B.C.; Mex. Plain 



Submont, Au-S. 



6. STENOPHYLLUS Kaf. 



Scapose annuals, with narrow!}- linear or filiform leaves. Spikolet? umbellate, 

 or capitate, rarely solitary; glumes si)irally arranged, imbricate, deciduous. 

 Flowers perfect; perianth wanting. Stamens 2 or 3. Base of the style swollen, 

 persistent, forming a tubercle; stigmas 2 or 3. Achenes 3-angled or lenticular. 



1, S. capillaris (L.) Britton. Annual; stems "tufted, filiform, smooth, 5-25 



cm. high; leaves filiform, roughish; bracts 1-3, setaceous; spikelets narrowly 

 oblong, 5-8 mm. long, less than 2 mm. thick, in terminal, simple or compound 

 umbels; glumes oblong, obtuse or emarginate, dark-brown with green keel; achenes 

 yellowish, transversely wrinkled. River valleys: Me. — Fla. — Cahf. — Ore. (but 

 no specimens seen from the Rockies). Jl-S, 



6. FIMBRISTYLIS Vahl. 



Annual or perennial sub-scapose herbs, with grass-Uke leaves. Spikelets 

 capitate or in ours umbellate, terete, several- or many-flowered; glumes spirally 

 arranged, unbricate. Flow^ers perfect; perianth none.' Stamens 1-3. St^de 

 usually enlarged at the base, but wiioUy deciduous at maturity; stigmas 2-3. 

 Achenes lenticular or 3-angled. 



1. F. interior Britton. Perennial, with short stoloms; stem thickened at 

 the base, striate, smooth, 3-6 dm. high; leaves rough-margined, involute; spike- 

 lets in somewhat compound umbels, ovoid or ovoid-oblong, acutish, 1 cm. long 

 or less; glumes yello wash-brown, ovate, striate, mucronate, dull; achenes broadly 

 obovate, blunt, cancellate, chestnut brown. F. castanea and F , thermalis of FI. 

 Colo, Meadows: Colo, — Xeb. — Tex. Plain. Jl-Au. 



7. ERI6PH0RIJM L. Cotton-grass. 



i o 1 r ly 



■^. 



Perennial bog plants, with rootstocks. Stems triangular or terete. L 

 with linear blades or some of them reducer! to bladeless sheaths. Spikelets 

 terminal, solitary, or a few in heads or umbels. Glumes spirally arranged, all 

 usually subtending perfect flowers. Perianth of 6 members, but eanh 4-6-cleft 

 to the base into long soft, usually white bristles, exserted much beyond the glumes 

 at maturity. Stamens 1-3. Styles deciduous; stigmas 3. Achenes 3-angled, 

 oblong, ellipsoid or obovoid. 



Spikelets solitary; involucre wanting. 



Plant stolomferous. . , « c- i, ^ • 



Glumes purplish-brown with narrow, pale margins. 1. E. ^cheuchzerx. 



Glumes purplish-brown with white, broad margins. 2. E. Chaniissonis. 



Plant tufted, not stoloniferous. 



Upper sheaths inflated; stem rough above. 3. E. callitrix. 



Upper sheaths not inflated; stem smooth. 4. E. opacum. 



Spikelets several, subtended by foliaceous bracts. _ 



Leaf-blades triangular-channeled throughout. 5. E, graale. 



Leaf-blades flat, at least below the middle. . ^ , , 



Midrib of the glumes not prominent at the tip of the glume. 



6. E. ang us U folium. 

 Midrib of the glumes prominent to the very tip. 7. E. riridicarinatum. 



1. E. Scheuchzeri Hoppe. Stem slender, 2.5-4 dm. high; sheaths all 

 blade-bearing or the uppermost one bladeless; blades filiform, channeled. E. 

 capitatum Host. Bogs : Lab. — Xew-f . — Wyo. — B.C. — Alaska. MonL — A Ip, 



Jl-0. 



