CVI. CYPEHACEJS. 



505 



Wahl 



,Cdrex7\ 



and in C. paniculata a central line goes from the convex surface of the 

 fruit, along the back, which is sometimes winged and then gives the 

 beak a triangular form 5 but the beak is often as compressed as in 

 C, paradoxa, A form of this species, with the habit of C. paradoxal 

 occurs near Manchester, and at Malham Tarn in Craven, Yorkshire. 



r 



18. C. yulpina {great C.) ; spikelets compound collected 

 into a cylindrical crowded spike, fruit ovate-acuminate plano- 

 convex nerved longer than the glumes divergent, beak finely 

 serrate bifid, stem very acutely triangular, the angles scabrous, 

 leaves broad. E. B. t. 307. C. nemorosa Willd. 



Wet shady places, especially near water. 2/.. R, Two feet or 



more high ; stem stout, rough, as are the margins of the broad leaves. 

 Bradeas small, setaceous. Spike large, greenish. Fruit pale, rou"-h 

 at the margin of the lengthened heah, and bifid at the point. Achene 

 oval, compressed, with a beak. 



***** Spikelets simple, alternate, sterile at their extremity. Root Jihrovs, 



^ 19. C. divulsa Gooden. {gray C.) ; spike elongated lax con- 

 sisting of 5—6 simple spikelets which are subremote below 

 with pale membranous acute scales, fruit ovate acute suberect 

 obscurely nerved rough at the point with blunt margins longer 

 than the mucronate pale membranous glumes, stem with rou'^h 



angles. E. B. t. 629 {young). ^ * " 



in Bot. Gaz. vol. iii. p. 19. 



Moist shady pastures, not rare. 2^. 5, 6. — This species much 

 resembles the next : in the fruit we can scarcely discern any differ- 

 ence, except that it is scarcely so acuminate, and is erect instead of 

 diverging: the achene is rather narrower. The colour of the whole 

 plant is paler, the spikes more elongated and slender, with more distant 

 spikelets. "The slight difference in the distance of the spikelets is 

 not a specific character, and I doubt whether the difTerence in the 

 glumes is sufficient to constitute C. divulsa a distinct species, es- 

 pecially when we find such a suspicious intermediate form as the C. 

 muricata virens of Andersson." — McLar. 



20. C. muricata L. {greater prickly C.) ; spike oblong of 

 4—6 compact or approximate simple spikelets with brow'nish 

 ovate pointed scales, fruit ovate-acuminate spreading with acute 

 rough margins longer than the mucronate brown glumes, stem 

 with rough angles, E. B. t. 1097. C. spicata Huds. 



Marshy and especially gravelly pastures, 2^ , 5,6. — Stem 1 — 2 ft. 

 Jiigh, slender. Bracteas small, lanceolate, subsetaceous. Fruit yellow- 

 »^rown, broad, rather large. • ^ 



Spikelets (simple) alternate, sterile at their extremity. Root 



{underground stem) creeping. 



21. C. arendria L. {Sea C) ; lower spikelets fertile, upper 

 ones sterile, intermediate ones sterile at the end, all crovvded 

 into an oblong interrupted spike, fruit ovate with a membra- 



z 



