364 



OKDEK 154. CYPERACE.^. 



.1 T. autumnal!* (L.) (Fig. 5.) Culm flattened, 2-edged, very slender, 310'; iva. 



narrow-linear, flat, ranch shorter ; spikes (Fig. 6) lance-oblong, very acute, 4-rowed, 



2", 1 3 together, many in the cyme ; glumes sharp- 

 pointed, brown ; stamens 2 ; achenium (Fig. 7) white 



smooth. Wet banks, &o. 

 \t T. ciliatifolia (11.) Culm setaceous, angular, 



312' ; leaves setaceous, with long brown hairs on the 



sheaths : cyme 5-9-rayed, often overtopped by 1 bract ; 



spike 1 ^' / , mostly single ; glumes acute, 4-rowed, 



li 12 ; stamens 2; achenium white, fi) Dry, S. 

 /3. coarctata. Cyme contracted ; spks 2 3", often 



2 3 clustered together. 

 a T. capil2a.rls (L.) Culm capillary, angular, 3 8'; 



leaves setaceous, much shorter, entirely smooth ; spk. 



2 4 in the simple cyme ; gls. 812, strongly keeled, 



4-rowed ; stamens 2 ; ach. white, equally 3-sided. (I) 



Sandy fields. Titr. 8, a flower.) 



4 T. borealis Wood. Culm filiform, angular, 2 4 / ; 



Ivs. linear, flat. J -i'\ bracts similar, as long as the 

 leaves; spikes capitate and in cymes, 15 together, 

 ovoid, green, 1"; glumes pointed; sta. 1; ach. white, 

 H-an<rkd ; sty. bulbous at base. QL) 111. Banks of the 

 Miss. R., 111. (J. Wolf.) Shores of Lake Sup.. Mich. 

 (Mr. Perkins.) 



5 T. steiiopliylla (Ell.) Culm setaceous, grooved, 



2 1'; kaves setaceous. 2 3'; bracts many, 3 4 time* 



longer than the douse In ad ; ach. (Fig. !') blackish. S. 

 t> T. Ware! (Torr.) Culm filiform. If. 3-angled ; lvs>. 



and bracts setaceous, Mlky-fringed at base, the latter twice longer than the head 01 



8 12 ovate spikes. Flu. 



7 T. cariuata (Hook, and Am.) Culm nattened-setaceous, 3 &, with 1 short seta- 

 ceous leaf at base ; spk. ovoid, near the top ; gls. 5 8, broad-ovate, acuminate. S-W. 

 S T. LKPTALEA (Schultes y) Culms filiform, bright green, flaccid, 6 12", sheathed at 



base, with a short setaceous leaf or ; spk. ovate, whitish, as long as its bract (3") ; 



sta. 3 ; ach. 3-angled, siiiniii^. Cult, in conservatories. From S. Eur. 



12. PSILOCARYA. Torr. Fls. 2 . Gls. GO, imbricated all around, all 

 Ibrtile. Setae 0. Stam. 2, long, persistent. Style 2-clefr, dilated or tuber- 

 culate at base. Ach. biconvex, crowned with the persistent style, (f) 

 Culms leafy. Spikes lateral and terminal, cymous, brown. 



1 V. scirpoides Torr. Culm 3-sided, slender. 59' ; Ivs. linear, 3 5', about 2 on the 

 culm, a cyme in each axil ; spike ovoid. 23" ; ach. 20 30, smoothi'Sh (slightly 

 rugous), tippid with the long 2-cleft style. Ponds, It. I., and N. 



1 P. nltens (YuhJ.) Culm 1J 2f. flattened, with several long linear leaves; cymea 

 loose, spike lance-ovoid. 2'', all pedicellate ; ach. 8 10. conspicuously rugous, tipped 

 with the entire-part of Ihe styie. blackish when ripe. S. 



13. DICHROMENA, Rich. Spikes flattened, in a terminal head 

 Gls. imbricaied all around, mr.ny empty. Perianth 0. Sta. 3. Sty. 2-cleft. 

 Ach. lens shaped, crowned with the broad tubercular base of the style. 

 Culms leafy. Bracts discolored. 



1 D. leucocephala MX. Culm 3-an^led, 1 2f ; leaves narrow-linear: inrol. of 6 S 

 narrow leaves, which are whitened at base as well as the spikes ; ach. rugulous, tnin- 

 ff.\f, the tubercle not. decurrent. Barrens, N. J., and S. 



