16 C. B. Clarke: 



Spicae in umbella simplice dispositae. 



Glumae mucronulatae . . . . 7. P. nitens Nees. 

 Glumae apice triangulares, vix acutae 



11. P.helvus C.B.Clarke. 

 ** Eobustior. Spiculae 5 mm. latae. Umbella 1 2 dm. lata 



12. P. angulatus Nees. 



6. Pycreus flavescens Reich. annua, caespitosa, culmis 2 30 cm. 

 longis; foliis cum 2 / 3 parte culmi aequilongis, 1 3 mm. latis; umbellae 

 radiis 1 6, usque ad 7 cm. longis; bracteis umbellam superantibus, 

 foliiformibus; spiculis compressis, luteis aut fuscis, 5 20 mm. longis, 

 2 3 mm. latis, 6 50-floris, lateribus subparallelis; glumis ovatis, ob- 

 tusis, paullo inflatis; styli ramis 2, e gluma parum exsertis; nuce cum 

 2 / 5 parte glumae aequilonga, obovoidea, lucide nigra, tenuiter transver- 

 sim undulato-lineolata; nucis cellnlis extimis, praesertim in humeris, 

 longitudinaliter oblongis. 



Pycreus flavescens Beich. Fl. excurs. (1830 32) p. 72; C.B. 

 Clarke in Hook. f. Fl, Brit. Ind, VI (1893) p. 589. 



Cyperus flavcscens Linn. Sp. Pl. ed. I p. 46, cd. II p. 68, nec 

 Linn, hcrb. propr.; Kunth Enum. II p. 5; Boeck. in Linnaea XXXV 

 (186768) p.438, nec Schkuhr. 



Hab. in ins. caribaeis: Sieber Agrost. n. 105; Haiti prope Ma- 

 riani in uliginosis: Picarda n. 1108. 



Distrib. in Europa, Asia occidentali , Africa; in America rara. 



7. Pycreus liitens Nees, annua, caespitosa, culmis 2 30 cm. 

 longis; foliis cum 2 / 3 parte culmi aequilongis, 1 3 mm. latis; umbellae 

 radiis 1 6, usque ad 0--10 cm. longis; bracteis 3 6 cum umbella 

 subaequilongis, foliiformibus; spiculis breviter spicatis, stramineis aut 

 brunescentibus, 5 18 mm. longis, 2 mm. latis, 8 44-floris; glumis 

 ovatis, apice oblique patulis, saepissime mucronulatis; styli ramis 2, 

 paullum exsertis; nuce parvula, cum x / 3 2 / 5 parte glumae aequilonga, 

 obovoidea, compressa, apice truncata, levi; nucis cellulis extimis sub- 

 quadrangulis. 



Pycreus nitens Nees in Linnaca IX (1834) p. 283; C.B.Clarke 

 in Hook. f. Fl. Brit. Ind. VI p. 591. 



Pycreus pulvinatus Xees in Linnaea IX (1834) p. 283. 



Cyperus pumilus TAnnJ Amoen. Acad. IV (1758) p. 302 et Sj). 

 Pl. ed. II p. 69; Kunth Enum. II p. 4 pro minorc parte; nec Bottb. 

 nec Nees. 



Cyperus nitens Betx. Obs. fasc. V (1789) p. 13? ; Kunth Enum. II 

 p. 3; Boeck.l in Linnaca XXXV (186768) p.483. 



Hab. in Martinique: Duss n. 477. 



Distrib. in Florida; in orbe vetere calidiore communis. 



