CYPERACE&. 



313 



Style 2-3-cleft, with a bulbous base, which is deciduous or per- 

 sistent. 



1. F. AUTUMNALIS (Autumn Club Rush). Culms low, slender, com- 

 pressed, tufted ; leaves narrow linear, flat, acute, shorter than the stem ; in- 

 volucre 2-leaved ; spikes oblong, acute ; glumes ovate-lanceolate, brownish, 

 mucronate ; stamens 2-3 ; style 3-cleft, entirely deciduous. In muddy 

 grounds, 3'-8' high. August-October. 



2. F. CAPILLARIS (Annual Club Rusk). Culms nearly naked, capillary 

 in dense little tufts ; leaves setaceous, shorter than the culms, with sheaths, 

 hairy at the throat ; involucre 2-3-leaved ; spikes ovoid ; glumes oblong, 

 brownish ; stamens 2 ; style 3-cleft, the bulbous base persistent. In sandy 

 fields, 3'-6' high. August. 



7. Rhyncospora. Flowers in ovate, several-flowered, loose spikes. 

 Lower glumes usually empty. Perianth of 6 bristles. Stamens usu- 

 ally 3, Style 2-cleft. Achenia coherent with the bulbous, persistent 

 base of the style. 



1. R. ALBA ( White Beak Rush} Culm slender, 3-angled above, leafy ; 

 leaves linear, very narrow, spikes lanceolate, white, in corymbose, axillary 

 and terminal fascicles, on slender peduncles ; glumes lanceolate ; achenium 

 ovoid, shorter than the bristles, with a slender beak or tubercle nearly as long 

 as itself. July- August. 



2. R. GLOMERATA (Beak Rush). Stem slender, triangular, leafy ; leaves 

 linear, flat, rough on the edge ; spikes oblong-ovate, in dense, very distant 

 clusters, on long peduncles, sometimes in pairs from the same axil ; ache- 

 nium obovoid ; bristles rough backwards. In wet grounds, 10-20' high. 

 July- A ugust. 



8. Cladium. Flowers polygamous, in a loose spike ; lowerglumes 

 empty ; terminal ones bearing a perfect or fertile flower. Perianth of 

 bristles none. Style 2-3-cleft, deciduous. Achenium hard and corky, 

 without a tubercle. 



C. MARISCOIDES (Twig Rush). Culm leafy, obscurely triangular, erect; 

 leaves narrow-linear, channeled ; spikes in heads or clusters of 5-8, arranged 

 in small, compound cymes or umbels, on very long peduncles ; glumes light 

 tawny-brown ; styles 3-cleft ; achenium ovoid-globose, with a short beak. 

 In meadows and low grounds. i2'-2i' high. July-August. 



9. Carex. Flowers monoecious ; the two kinds are either com- 

 bined in the same spike, or else arranged in different spikes ; rarely 

 dioecious. Glumes single, I- flowered, imbricated without order. Sta- 

 mens 3, rarely 2. Stigmas 2-3. Achenium inclosed in a perigynium, 

 or inflated persistent sac, contracted and closed at apex, and crowned 

 with more or less of the persistent base of the style. 



i. C. BROMOIDES (Slender Swamp Sedge). Stem slender, leafy ; spikes 

 several, approximate, oblong-lanceolate, alternate, lower ones barren, or all 



