C. retrorsa N. ab E. in Linn. 10. 204 (non Schwein.) 
— C. cognata Kunth, 502. 
Prom. bon. spei (Mundt). 
416. ©. riparia Curt. 
Glaueo- v. luteo-viridis; rhizomate stolonifero; culmo 
elato 3—4—2 pedali strieto acutangulo ad angulos superne 
saepiss. scabro, folioso; foliis subcoriaceis elongatie la- 
tisve eulmum non raro superantibus longe angustato -acu- 
minatis inferne complicatis superne planis, carinatis, mar- 
gine superne acute serratis4--3—5 lin. lat.; vaginis lon- 
gissimis, margine hyalino-membranaceo integro v. fibroso- 
dissoluto; spieulis masculis 4—5—3 (infima saepius an- 
drogyna) confertis v. parum remotis ferrugineis v. brun- 
nescentibus draoteatis, suprema majori eylindracea v. ob- 
longo-lanceolata 2—1 poll. longa 3 lin. eire. lata; foe- 
mineis 3—4—2, apice non raro masculis, remotis eras- 
sig brunnescenti-olivaceis, inferioribus peduneulatis, eylin- 
draceis obtusis 11,--3, raro ad 4 poll. longis *—5 lin. 
orassis ; bracteis foliaceis — infima excepta— evaginatis, infe- 
rioribus valde elongatis culmum excedentibus, illis spiewle- 
rum mascul. brevibus late amplectentibus euspidatis; pedun- 
eulis validis trigonis laevibus v. sparsim spinulosis; squa- 
mis masculis hyalino-membranaceis elongatis oblongis v. 
oblongo -linearibus acutiuseulis v. apice emarginulatis, mn-. 
tieis v. tenui-cuspidatis; foemineis ovato-lanceolatis v. 
anguste oblongis, /onge euspidatis, euspide valido serrulato; 
utrieulis squamam subaequantibus olivaceo-brunnescentibus 
coriaceo-crasais, v. oblongo-trigonis v. ovatis hine planiuseu- 
lis inde subangulato-convexis in rostrum breve ac latum 
bidentatum attenuatis, nervosis laevibus obsolete celluloso- 
retieulatia 3—2%/, lin. long.; caryopsi perlaxe incluss 
