ORDER 154. CYPERACE^E. 



357 



ent base crowning the flattened achenium. Perianth of 6 9 barbed setae 

 U Culm leafy. Racemes of spikes 2-rowed, axillary. August. 



D. spathaceum Pers. A sedge of peculiar and striking aspect, in .narshes and by 

 streams : common. Culm erect, 1 2f, leafy to the top, the leaves linear, in 3 ranks. 

 Spikes 1', alternately arranged on the axillary leafless branchlets. 



2. CTPERUS, L. GALINGALE. 

 SEDGE. Spikes flattened, distinct, 

 many-flowered. Glumes imbricated 

 in 2 opposite rows, nearly all florifer- 

 ous. Setae 0. Stamens 3 2. Style 

 3-(rarely 2-)cleft, deciduous. U 

 Culms simple, leafy at base, triangu- 

 lar, bearing an involucrate simple or 

 compound head or umbel at top. 

 June to Sept. 



PYCRECS. Style 2-cleft, nut flattened 

 Spikes flattened, 10-30-flowered.. .(*) 



CYPERUS. Style 3-cleft, nut 3-angled. Spk 

 5-50-flowered...(**) 



MABISCUS. Style 3-cleft, nut 3-angltx.. 

 Spikes 1-5-flowered, deflexed (n) 



* Stamens 2 (or partly 3 in No 1) NOB. 1' 



* Stamens always 3 Nos. 4, . 



** Culm with many joints, teretish. with leafless sheaths at base. .No. 6 

 ** Culm jointless, triquetrous, leafy below.. (a) (Invol. of 201vs. No. 35) 



a A pair of free persistent scales within each glume. Pis. dense. .7 

 a Scales aclnate to the rachis or wanting. . .(*) 



6 Spikes capitate at the top of the peduncle, flattened., .(c) 

 b Spikes racemed or clustered, terete or flattened. Stam. 3. . (m) 

 c Glumes with recurved points. Stamen 1 only. .Nos. 8, 9 

 c Glumes with erect points or pointless. Sta. 1. . .Nos. 10, 11 

 c Glume:' with erect points. Stamens 3. . . (d) 

 d Umbel compound. Spikes flattened. 3 5 in the clusters. .Nos. 12 14 



d Umbel simple. x Spikes flat, 12-30-flowered Nos. 15, 16 



x Spikes flat, 5-7-ttowered. Head solitary.. .No. 17 

 x Spikes flattish, 6-12-flwd. lids. 17.. .Nos. 1820 



m Spikes flat, 12-24-flowered. 2-rowed in the clusters .^fos. 2123 



m Spikes flat, 5-12-flwd., many-rowed in the clusters . .Nos. 24, 25, 35 



m Spikes terete, y few, arranged in 2 rows in the clusters No. 26 



y many, arranged in many rows Nos. 27 29 



n Spikes 3-5-flowered, with 47 glumes Nos. 3032 



n Spikes only 1-flowered, with 3 or 4 glumes Nos. 33, 34 



1 C. dlaiidrus Torr. (Fig. 1.) Slender, 4 IV ; nmbel of 2 5 very 

 short unequal rays ; spikes (Fig. 2) flat, oblong, obtimsh, 4 8", 

 fascicled ; glumes (Fig. 3) 1221, brown, with a green keel ; stamens 

 (Fig. 4) mostly 2; nut dull. August. Pretty. 

 .3. ca*tnnfux. Glumes numerous, and of a dark chestnut-brown. 

 V. pauciflortis. Glumes only 5 9, edged with yellow, 2 3", crowded. 

 it. Nut la 11 II Torr. Culm erect, 4 \y\ rays few and short ; spike lance-linear, very 

 acute, GC-flwd., crowded; glumes acute, yellowish-brown ; stamens 2; ach. dull. @ 

 B. minimus. Very slender, 3 4', hds. few or several. 2-5-flwd. ; sta. 1. N. J., Pa 



