ORDER 154. CYPERACE^E. 



357 



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

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

 D. spatliacetim Pers. A sedge of peculiar and striking aspect, in marshes 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. CYPERUS, L. GALINGALE. 



SEDGE. Spikes flattened, distinct, 

 many-flowered. Glumes imbricated 

 in 2 opposite rows, nearly all florifer- 

 ous. Seise 0. Stamens 3 2. Style 

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

 Culms simple, leafy at base, triangu- 

 lar, bearing an involucrate simple or 

 compound head or umbel at top. 

 June to Sept. 



PYCREUS. Style 2-cleft, nut flattened 

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



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

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



MAIUSCCS. Style 3-cleft, nut 3-angIe^. 

 Spikes 1-5-flowered, deflexed (n) 



* Stamens 2 (or partly 3 in No 1) No*. 1 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 20 Ivs. No. 35) 



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

 a Scales adnate to the rachis or wanting.. .(&) 



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

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

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

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

 c Glumes with erect points. Stamens 3. . . (d) 

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



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



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

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



m Spikes flat, 12-24-flowered, 2-rowed in the clusters Nos. 21 23 



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



m Spike* terete, y few, arranged in 2 rows in the clusters No. 20 



y many, arranged in many rows Nos. 2729 



n Spikes 3-5-flowered, with 47 glumes No?. 3032 



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



1 C. diaiidrus Torr. (Fig. 1.) Slender, 410'; umbel of 2-5 very 

 short unequal rays; spikes (Fig. 2) flat, oblong, obtu-i h, 4 #", 

 fascicled ; glumes (Fig. 3) 12 24, brown, with a green ket-1 ; stamens 

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

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

 1 y. pauciftbrttr. Glumes only 5 9, edged with yellow, 2 3", crowded. 

 2 C. Nuttallii Torr. Culm erect, 4 12' ; rays few and short ; spike lance-linear, very 

 acute, QC-flwd., crowded; glumes acute, yellowish-brown; stamens 2; ach. dull. (I) 

 P. minimut. Very slender, 34', hds. few or several. 2-5 flwd. ; sta. 1. N. J., Pa. 



