SEDGE FAMILY 1 1 1 



spikelets ovoid-oblong, obtuse, 3-10 mm. long; glumes ovate or lanceolate, acute 

 or subacute. Swamps : Newf . — Fla. — ^La. — Sask. Plain, Au-S. 



19. S. atrocinctus Fernald. Stem 5-12 dm. high, smooth, terete; leaves 

 bright green, 2-5 mm. wide; bracts blackish at the base; sinkelets 2.5-6 mm. 

 long; glumes lance-ovate, acute; achenes 3-angled, white, ovate. Swamps: 

 Newf. — N.J. — la. — B.C. Suhmont.—Moni. Je-Au. 



10. HEMICARPHA Nees & Arn. 

 Dwarf annual tufted herbs. Leaves narrow, often setaceous. Spikelets 



terete, solitary or in small clusters. Glumes spirally arranged. Flowers per 

 feet, each with a small translucent scale between it and the axis. Perianth want- 

 ing, i. e.j bristles none. Stamen 1. Style 2-cleft, not swollen at the base. 



1. H. aristulata (Coville) Smyth. Stem longer than the setaceous glabrous 

 leaves, 5-20 cm. high; bracts 1-3, sometimes 2 cm. long; spikelets 4-8 mm. 

 long; glumes rhombic-obovate, brown, abruptly contracted into a subulate awn 

 about as long as the body; achenes narrowly obovate, black. //. intermedia 

 Piper. Sandy banks: Kans. — Tex. — Calif. ^Wash. Son. — Submont, Jl-S, 



11. KOBRESIA Willd. 



Sedge-Uke perennials, with monoecious flowers. Spikelets several-flowered^ 

 forming a terminal spike. Glumes spirally arranged, the lower usually enclos- 

 ing a pistillate, the upper a staminate flower. Stamens 3. Perianth lacking. 

 Style short; stigmas 3. Achenes obtusely 3-angled. 



1. K. bipartita (All.) Delia Torre. Stems solitary or tufted, 1-3 dm. high, 

 smooth; leaves about 1 mm. wide, invohite; spikets several in a spike, ascending, 

 linear; glumes somewhat serrulate on the keel, fully 1 mm. long. K. caricina 

 Willd. Arctic-alpine situations: Greenl.^Alta. — B.C. Alp. Je-S. 



12, ELYNA Schrad. 



Low, tufted, sedge-like monoecious plants. Leaves mostly basal, narrow. 

 Spikelets 2-flowered, forming a terminal spike. Glumes of the spikelets 3 or 4, 

 usually only one flower-bearing. Flowers 2, one staminate of 3 stamens, the 

 other pistillate with a single pistil. Perianth none. Style slender, not jointed 

 to the ovary; stigmas 3. Achenes obtusely 3-angled. 



1. E. Bellardi (All.) C. Koch. Densely tufted; stems slender, 1-4 dm. High; 

 old sheaths fibrillose, broNvn; leaf-blades revolute; spikelet subtended by a short 

 bract or bractless, 15-30 mm. long, 3-4 mm. wide; achenes appressed, ellipsoid, 

 2 mm. long or less. Arctic-alpine situations: Greenl.— Alta. — n X.^I. — Ore, — 

 Alaska; Eurasia. Alp. Je-Au. 



13. CAREX (Rupp.) L. Sedge.* 



Grass-Uke sedges, perennial by rootstocks. Culms mostly triangular, often 

 strongly phyllopodic or aphyllopodic. Leaves 3-ranked, the upper (bracts) 

 elongate or short, and subtending the spikes of flowers or wantmg. Plants 

 monoecious or sometunes dioecious; flowers soUtary in the axils of scales (glumes). 

 Spikes one to many, either wholly pistillate, wholly staminate, androg^-nous or 

 g^Tiaecandrous. Perianth none. Staminate flowers of three (or rarely two) 

 stamens, the filaments filiform. Pistillate flowers of a smgle pistil, with a style 

 and two or tliree stigmas. Achene completely surrounded by the pengj-nium, 

 or rarely rupturing it in ripening, 3-angled, lenticular or plano-convex. Rhacheola 

 occasionally developed. 



Spike one androgynous; perig>Tiia glabrous, thin, not margined or triangular, beaked; 

 style withering, not continuous with the achene; stigmas three. 

 Pistillate scales oersistent; perigj-nia not stipitate. not becoming reflexed. 

 Spike linear or linear-oblong: perigynia not inflated. 1. ^ardinae. 



Spike orbicular to short-ovoid: perigjTiiamflated. 2. -^^Y Ji ; ^nf,,Mf,. 



Pistillate scales deciduous; perig^-nia stipitate. at least the lower ^^^^^^^^^^^^^^^ • 



* Contributed by Mr. Kenneth K. Mackenzie. 



