36 Flora of the Palouse Region 



ing, almost filiform: spikelets terete, terminal, clustered or solitar}', 

 subtended by a 1-3-leaved involucre: scales in a spiral, deciduous, 

 all subtending perfect flowers: perianth of a single hyaline bract 

 between the flower and the rachilla: bristles none: stamens 1-3: 

 style 2-cleft, deciduous, not swollen at the base: akene oblong, 

 turgid or lenticular. 



H. intermedia Piper n. sp. Tufted, glabrous, the numerous stems 5-8 

 cm. tall, erect or spreading: leaves narrow, involute, the recurved blades 

 1-3 cm. long, as long as or longer than the sheaths: spikelets ovoid, obtuse, 

 solitary or two in a cluster, 2-4 mm. long: involucral bracts 3, the uppermost 

 1-3 cm. long, the others much shorter: scales 1-1.5 mm. long, broadly obo- 

 vate; the abruptly-acuminate recurved apex as long as the body: akene ob- 

 long, ovate or obovate, .5 mm. long, with a short beak, the surface very 

 minutely and regularly hexagonal-reticulate and rugose: styles shorter than 

 the akene, 2-cleft half-way to the base: hyaline bract triangular-ovate. 

 Very rare on the banks of Snake River at Almota. The species has the habit 

 of H. subsquarrosa Nees, but the heads of H. occidentalis Gray. 



58. CAREX. 

 Grass-like sedges, perennial by rootstocks: stems mostly trian- 

 gular: leaves 3-ranked, the upper (bracts) elongated or very short, 

 and subtending the spikes of flowers, or wanting: flowers solitary 

 in the axils of bracts (scales), monoecious or dioecious: spikes 

 either wholly staminate, or pistillate, or sometimes androgynous: 

 perianth none: staminate flowers of 3 stamens: pistillate flowers of 

 a single pistil with a style and 2-3 stigmas borne in the axil of a 

 second bract (the perigynium) which completely encloses the 

 akene: akene 3-angled, lenticular or plano-convex. 



Inflorescence a solitarv terminal spike, staminate at top. 



Leaves filiform. C. filifolia. 



Leaves flat. C. GEYERi. 



Inflorescence a head composed of several sessile densely aggregated spikes. 

 Spikes staminate at top. C. stipata. 



Spikes staminate at base. 



Bracts longer than the head. C. aThrostachva. 



Bracts short. C. festiya. 



Inflorescence composed of several distinct spikes. 



Spikes sessile, all androgynous. C. liddoxi. 



Spikes or some of them stalked, the uppermost staminate. 

 Stigmas 3. 



Perigvnium pubescent: pistillate spikes several, stalked. 



C. LANUGINOSA. 

 Perigvnium pubescent: pistillate spikes 1-3, sessile. 



C. DEFEEXA. 

 Perigynium smooth: pistillate spikes slender, 5-8 cm. long. 



C. amplifoeia. 

 Perigynium smooth: pistillate spikes stout, 3-5 cm. long. 



C. MONILE. 

 Stigmas 2. 



Perigynium globose, almost beakless. C. AUREA. 



Perigynium flattened, short-beaked. C. RIGIDA. 



Perigynium oval, resinous. C. nebrascensi.s. 



