ORDER 154. CYPERACE^E. 369 



$ 1. Spike solitary, one (rarely more) borne on each culm.. .() 

 II. Spikes two or more. Stigmas 2. Achenium lens-shaped.. .(; 

 III. Spikes two or more. Stigmas 3. Achenium triangular... ($) 

 Stigmas 2. Achenium lens-shaped or flattened. . .(a) 

 Stigmas 3. Achenium triquetrous or S-angled. . .(&) 



a Spike androgynous, staminate at the summit No. 1 



a Spike dioecious, or the 9 spike staminate at the base Nos. 2, 3 



b Leaves very narrow, shorter than the culm. Glumes colored. . .Nos. 4 6 



b Leaves linear, longer than the culm?. Glumes colored No. 7 



Glumes green Nos. 8 10 



b Leaves very broad, flat, with no midvein. Glumes scarious No. 11 



{$ Staminate and pistillate flowers in the same (androgynous) spike. . .(c) 



Staminate and pistillate flowers in different spikes on the same culm. . .(i) 



on different culms No. 12 



c i Flowers variously situated in the approximate spikes Nos. (12 and) 1315 



c <$ Flowers at the summit of the spikes. . .(d) 

 c $ Flowers at the base of the spikes. . .(/) 



d Spikes 00, paniculate, brown ; perigynia corky, not rostrate ...Nos. 16, 17 

 d Spikes (or spikelets) 8 GO, approximate in a compound spike. . .(e) 



e Perigynium rostrate, scarcely longer than the glume Nos. 18 21 



e Perigynium long-rostrate, 2 or 3 times longer than the gl Nos. 22, 23 



d Spikes 36, approximate into one ovoid spike. Nos. 2426 



cylindric spike a little loose. .Nos. 27, 28 



d Spikes 38, remote. Perigynia erect in No. 32, radiating in Nos. 2931 



/ Perigynia radiating in the 36 separated spikes. Glumes green Nos. 33, 34 



/ Perig. suberect, few (2 20) in each spikelet. Glumes hyaline white. . .(g) 

 / Perig. suberect, winged, 30 60 in each oblong to obovoid spikelet. . . (h) 



g Spkl. separate or remote, 2-3-flowered in No. 35, 5-20-flwd. in Nos. 3639 



g Spikelets closely contiguous l 2-12-flowered Nos. 40, 41 



h Perigynia lance-linear, long-beaked, 3 4". Spikelets close. Nos. 4244 

 h Perigynia lanceolate, short-beaked. Spikelets 8 20, club-ovoid. No. 45 

 h Perigynia ovate, spreading. Spikelets round-ovoid, close.. Nos. 46, 47 

 h Perigynia round-obovate, short-beaked, broadly-winged. Five 



nominal species closely related and intermixed Nos. 48 52 



Staminate spike single. Pistillate spikes sessile Nos. 5356 



i Staminate spike single. Pistillate spikes pedunculate Nos. 57, 58 



i Staminate spikes 1 or more, and the $ spikes often $ at the apex. ..(#) 



k Glumes obtuse, not exceeding the perigynia. Spikes sessile Nos. 59, 60 

 k Gl. acute-, little longer or shorter than perig. Lower spikes stalked. .6164 

 k Gl. long-awned, much exceeding the perig. Spikes all stalked. .Nos. 65 67 



$ Spike? androgynous, both kinds of fls. in each, $ at the apex Nos. 68, 69 



<J at the base No. 70 



Spikes the terminal 5 at .top, the rest all pistillate. ..(I) 



Spikes the terminal one wholly i , the rest all pistillate. . .(*) 



J> Staminate spikes habitually more than one... (**) 



/ Spikes erect or nearly so, green, hairy in Nos. 71 , 72, glabrous in Nos. 72 74 



I Spikes erect, pedunculate, tawny in maturity, glabrous Nos. 75, W 



I Spikes erect (some nodding in No. 79) with black-purple glumes Nos. 7779 



I Spikes drooping on filiform stalks, green or some rusty Nos. 8083 



* Pistillate spikes sessile, or solitary on radical peduncles. Perig. with 



a short abrupt beak, not inflated, pubescent. Culm slender. . .(m] 



* Pistillate spikes with enclosed or nearly enclosed peduncles. Perig. 



inflated, beaked, glabrous, bicuspidate at apex. Spikes turgid, 

 often quite large, their leafy bracts longer. . .(n) 



* Pistillate spikes on exserted peduncles (exserted from the sheaths of 



24 



