BQ SS.Trasus. 9. CYPERACE^. Pl.end.ph. 



1. Trasi ivith a?idrogynous spikes. 



1 . Trasus pauciflorus. Fewjiowered sedge. 

 Spike androgynous, not branched, mostly 4 or 5-flowered; 



male jinwer terminal, mostly solitary ; fruit lanceolate, 

 round, reflexed ; glume of the female flowers deciduous ; 

 leaves long, convolute ; upper sheaths leafless. 



Carex patula, Hudson Fl. ^n^. 402, 657. 

 CareX leucoglochin, Lin. Sup. 413. 

 Carex pauciflora, Lighifuot Fl. Scot. I'iS, 



Alpine bogs ; perennial ; June. 



Root fibrous, in tufts ; culm 5 in. high, smooth ; leaves 

 usuallj^ in pairs, only half as long as the culm ; spike ovate, 

 oblong, acute; fruit yellowish green, striated. 



2. Trasus atratus. Black sedge. 



Spikes androgynous, 3 to 5, on footstalks, crowded, ter- 

 minal male in the lower part, fruitbearing, drooping ; fruit 

 subrotund, ovate, beak short, apex 2-toothed ; glumes ovate, 

 acute ; hractece. amplexicaul ; leaves crowded. 



Carex atrata, Lin. S. P. 1386. 



Alpine pastures ; perennial ; June, July. 



Culm upright, 2 feet high, angles smooth ; leaves light 

 green, broad, flat ,• hractecB leaflike, spreading ; spikes at 

 first upright, afterwards drooping ; stamens 2 or 3 ; glumes 

 black ; fruit yellow, ribless, smooth. 



2. Trasi with many spikes^ of different sexes. 



a. BractecB memlranous, leafiike ; terminal spike 

 solitary, male; female spikes sessile ; fruit hairy. 



3. Trasus clandestinus. Concealed sedge. 



Male spike footstalked ; female 2, usually 3-flowered, 

 distant, nearly sessile, concealed in the bractege ; fruit ob- 

 pvate, obtuse, hairy, apex not nicked ; leaves channelled. 



Carex prostrata, Allioni Fed. 2,267. 

 Carex clandestina, Goodenough L. T. 2, 167. 



On sunny rocks ; perennial ; May. 



Culms in tufts, 2 in. high, upright, 3-sided; leaves up- 

 right, 3 times as long as the culm, dark green, edge very 

 rough; rachis rough, hollowed out; male spike rather 

 3-sided, linear, manyfloweredj^ema/e 5piAe5 2 or 3, distant, 

 fewflowcred; hractece obtuse, brown, sheathing; glumes 

 obtuse, dark brown. 



