174 MONOCOTYLEDONS.- CYPERACE/E. CaTCX. 



pressed, sheaths leafy, spikelets terminal geminate, involucruni 

 1 -leaved, p, 19. Wet gravelly places. 

 tf Culms triangular. 



8. Sc. maritimuS) culm leafy, spikelets terminal clustered pe- 

 dunculate and sessile, involucre of many foliaceous leaflets, 

 scales with a mucro between the acute segments of a notch. 

 p. 19. Salt marshes. 



9. Sc. sylvaticus, culm leafy, cyme terminal many times com- 

 pounded, involucrum of many foliaceous leaflets, scales entire 

 acute, p. 19. Wet woods. 



4. CLADIUM. 



Scales imbricating the spikelets on all sides; outer ones sterile. 

 Slam. 2. Style 1 . Fruit a Nut with a loose external coat 

 (Epicarp.}, destitute of bristles at its base. 



1. Cl. Mariscus, panicle much divided leafy, spikelets capitate- 

 glomerate, culm rounded leafy, margins of the leaves and keels 

 rough, p. 11. Bogs, very rare. 



5. CAREX. 



Generally monoecious. Scales imbricating the spikes on all sides. 

 Barren flowers. Perianth 0. Stam.3. Fertile flowers (\\\ 

 the same or on different spike). Perianth monophyllous, ur- 

 ceolate, surrounding and concealing the ovary. Stigmas 2 3. 

 Nut or Achenium included in the enlarged perianth. 



* Spike simple, solitary, the upper part formed of sterile, the lower 

 of fertile flowers (except in C. dioica and Davalliana, which are 

 dioecious) . 



1 . C. dioica, spike simple dioecious, fruit ascending ovate shortly 

 acuminated striated rough at the margin upwards, p. 260. 

 Mountains. 



2. C. Davalliana, spike simple dioecious, fruit ovate much acumi- 

 nated recurvato-deflexed smoothish at the margin, p. 20. 

 Alpine Logs. 



3. C. pulicaris, spike simple androgynous, flowers few, fruit 

 distant oblongo-lanceolate acuminate reflexed, stigmas 2. 

 p. 261. Bogs. 



4. C. pauciftora, spike simple androgynous of very few flowers, 

 fruit distant lanceolato-subulate patenti-reflexed, stigmas 3. 

 p. 261. Alps. 



** Culm divided upwards into several spikes, which are sessile, andro- 

 gynous, with a subamplexicaul bractea at the base, and powers with 

 two stigmas. 



f Spikelets sterile at their extremity (except in C. arenaria and C. in- 

 termedia.). 



5. C. iucurva, spikelets sterile at their extremity collected into 



