192 MONOECIA TRIANDRIA. [CI. 21. 



426. SPARGANIUM. Bur-reed. 



1. S. ramosum, 11. 744. (Branched B.) Leaves triangular at the 



base, with concave sides. Common flower-stalk branched. Stigma 

 linear. • 



Watery pi. If. 7, 8. Stem erect, 3f. Balls of fl. alternate ; the 

 barren ones white, above the rest. 



2. S. simplex, 1 1. 745. (Unbranched B.) Leaves triangular at thebase, 



with flat sides. Common flower-stalk simple. Stigma linear. 

 Grav. pools & ditches. U . 7,8, Smaller. Cal. greenish. Anth. yell. 



3. S. nutans, 4. 273. (Floatmg B.) Leaves floating, flat ; concave 



at the base. Common flower-stalk simple. Stigma ovate, very 

 short. Ball of barren flowers mostly solitary. 

 Muddy fens. If. 7. Still smaller, floating. Cal. pale green. 



427. CaREX. Carex, or Sedge. 

 [A very extensive genus, with grassy herbage. Root perennial. 

 Stem simple, generally 3-angled. Leaf linear, pointed, roughish. 

 Seed loosely coated with the enlarged, hardened, single-valved, mem- 

 branous corolla; both together constituting the fruit.'] 



* Catkin solitary, simple. 



1. C. dioica, 8. 543. (Creeping C.) Catkins simple, dioecious. Fruit 



ovate, ribbed, ascending, finely serrated at the edges. Root 

 creeping. 

 Boo-s.l):. 5, 6. Stemsaspanhighatmost. Herbage slender, smooth. 



2. C. DavalKana, 30. 2123. (Prickly C.) Catkins simple, dioecious. 



Fruit lanceolate, triangular, ribbed, deflexed; its angles rough 

 towards the summit. 

 Boggy sit. rare. If. . 5, 6. R. tufted. Stems rough, taller. 



3. C°pulicdris, 15. 1051. (Flea C.) Catkin simple; florets in the 



upper half barren ; in the lower fertile. Fruit spreading, de- 

 flexed, polished, tapering at each end. Stigmas two. 

 Muddy boe-s. 2f . 6. R. fibrous. Stems 6—12 in. smooth. Fr. brown. 



4. C. pauciflora, 29. 2041. (Few-flowered C.) Catkin simple, lax, of 



few flowers ; the uppermost barren. Fruit spreading, deflexed, 

 awl-shaped, smooth. Stigmas three. 

 Alpine bogs, rare. If. 6. Smooth, 3 — 5 in. Fr. striated, rusty yell. 



** Catkins, or spikelets, aggregate, each composed of barren and 

 fertile florets. Stigmas 2. (In C. Vahlii 3.) 



5. C. stelluldta, 12. 806. (Prickly C.) Spikelets three or four, round- 



ish, slightly distant. Barren florets inferior. Fruit spreading, 

 with a tapering undivided beak. 

 Boggy mead. 2f .5,6. A span, grass-green. Spikel. roundish, brown. 



6. C. curta, 20. 1386. ( White C.) Spikelets about six, elliptical, 



slightly distant, scarcely bracteated. Scales ovate, membranous, 

 about as long as the ovate, tumid, smooth fruit. 

 Watery pi. rare. If . 6. If. Spikel. short, tumid, of a silvery hue. 



