286 CYPERACEAE 



21. FlLIFOLIAE. 

 Perigvnia essentially beakless, 2 mm. long, tipped by the long persistent exserted style; pistillate scales with 



narrow dull white margins. . , , , • , F' ,^-: ^•!;-*'''','"- 



Periffvnia distinctly beaked, 2.5-3.5 mm. long; pistillate scales with very broad bright white hyaline margins. 

 "•^ 86. C. fiiitoha. 



22. SCIRPINAE. 



Culms phyllopodic with 6-10 well-developed leaves; perigynia blackish-tinged at least at apex. 



Perigy'nia sparsely pubescent towards apex only. , , , , c-, r- ■ 



Perigvnium body broadly oval, 3 mm. long, very abruptly beaked. 87. C. gigas. 



Perig'ynium body lanceolate, 4 mm. long, tapering into the beak. 88. C. scabriuscula. 



Perigynia strongly 'pubescent, obovoid-triangular. 89. t. pseudo-scirpoidea. 

 Culms aphyllopodic with 3-5 well-developed leaves; perigynia lighter in color. 



Perigynia lanceolate, flattish, 4 mm. long. 90. C, stenochlaena. 



Perigynia broader, triangular, 3 mm. long or less. 91- t. scirpoidea. 



23. MONTANAE. 

 Basal spikes not developed. 92. C. inops. 



Basal spikes present. 



Perigynia finely many-ribbed as well as strongly 2-keeled. 



Perigvnia strongly 2-keeled, otherwise ribless. , .. ,, , j i- i. u 



Bract of lowest non-basal pistillate spike leaflet-like, exceeding culm; if at all colored, purplish-brown- 



tinged at base. , , ■ , 



Perigvnia 2.5-3 mm. long, the beak 0.25-0.75 mm. long, shallowly bidentate. 



•^ 95. C. brez'ipes. 



Perigvnia 3-4.5 mm. long, the beak longer, bidentate. 96. C. rossn. 



Bract of'lowest non-basal pistillate spike squamiform and shorter than culm; or, if longer, auriculate 

 and strongly reddish-brown-tinged at base. 97. C . brczicaulis. 



24. DiGITATAE. 

 Represented by one species in our range. 98. C. conannoides. 



25. Triouetrae. 



Represented by one species in our range. 99. C. tnquetra. 



26. BiCOLORES. 



Perigynia short-tapering at apex, straw-colored, 2.5-3.75 mm. long. 100. C. salinaeformis. 



Perigynia rounded or truncate at apex, orange-colored or white-pulverulent, smaller. 



Mature perigynia whitish, ellipsoid, not fleshy or translucent; scales appressed. 101. t. iiassei. 

 Mature nerigynia orange or brownish, broader, fleshy, translucent; scales spreading. 



^ 102. C. aurea. 



27. Paniceae. 



Perigynia beakless or nearly so; bract sheaths short; plant glaucous; leaf -blades narrow, involute. 

 Perigynia strongly beaked; bract sheaths long; plant not glaucous; leaf-blades broad, flat. _ . 



Iu4. L. CQi If 0} HtCQt 



28. Laxiflorae. 



Represented by one species in our range. 105. C hendersomi. 



29. Debiles. 



Lowest bract sheathless or very short-sheathing; spikes approximate; perigynia glabrous, strongly ribbed or 



nerved. , , , ■ , i j 



Perigynia ovoid, 3.5-4.25 mm. long, abruptly short-beaked, the sides several-nerved. . 



Perigynia ovoid-lanceolate, 4-5 mm. long, tapering into the beak, the sides strongly ribbed. 



107. C . zciiitucyi. 

 Lowest bract long-sheathing; lower spikes more or less strongly separate; perigynia faintly nerved or 

 nerveless. , , . . 



Perigynia and leaf-blades hairy; spikes oblong or short-oblong, the upper approximate. 



Perigynia 4-5 mm. long, round-tapering at base, finely many-nerved. 108. L. gynoaynama. 



Perigynia 3.5-4 mm. long, tapering at base, 2-keeled, otherwise nerveless. 109. t. IwUssima. 

 Perigynia glabrous or puberulent above; leaf-blades very sparsely hairy; pistillate spikes linear, widely 

 o oi-ote 110. C. mendocmensis. 



Scp3r3,tc. 



30. Frigidae. 



Perigynia compressed-triangular or slightly flattened, the beak bidentulate; scales obtusish, the midvein not 

 prominent at apex. , ., ... . ^, ^ ,f,,„;„oto 



Perigynia somewhat compressed-triangular, 3.5 mm. long or less; spikes widely separate, the stammate 

 one usually strongly overtopping the uppermost pistillate one; lower bracts with conspicuous blades. 



J. 1 1. O, I V rft f'l' O It I Z • 



Perigynia compressed-triangular, longer; uppermost pistillate spikes bunched, usually little exceeded by the 

 staminate one; blades of bracts usually less developed. i n r- ; ;■ 



Pistillate spikes oblong; scales reddish-brown. ll'^- ^- '"cunna. 



Pistillate spikes linear-oblong; scales dark-tinged. . H-'- V- "0(ara. 



Perigynia strongly flattened, the beak bidentate; scales sharp-pointed with midvein prominent to apex. 

 Perigynia glabrous; scales smooth; bract sheaths strongly enlarged upwards; leaf-blades very leattiery. 



°-^ 114. C. hiznlaejolia. 



Perigynia sparsely hairy; scales more or less hairy; bract sheaths scarcely enlarged upwards: leaf-blades 

 not leathery. US. C. fissuricola. 



31. Track ychlaenae. 



Represented by one species in our area. H"- ''• ^P'-^-^"- 



