16 C. B. Clarke: 



Spicae in umbella simiilice dispositao, 



Glumae mucronulatae . . . . 7. P. niiens Neos. 

 Glinnae apice triangulres, vix acutae 



11. P. helvus C.B.Clarke. 

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



12. P. angulatus Nees. 



6. Pycreiis flaycsccns 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 suporantibus, 

 foliiformibus; spiculis compressis, liiteis 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 parimi exsertis; nuce cum 

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

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

 longitudinaliter oblongis. 



Pycreus flavescens Reich. Fl. exciirs. (1830 32) p. 72; C. B. 

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



Cyperus flavescens Linn. Sp. PI. ed. I p. 46, ed. II p. 68, nee 

 Linn. herb, jjropr.; Kunth Enum. II p. 5; Boeck. in Linnaea XXXV 

 (186768) p.438, nee 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 nitens 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 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 Ys Vs parte glumae aequilonga, 

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

 quadrangulis. 



Pycreus nitens Nees iji Linnaea IX (1834) p. 283; C. B. Clarke 

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



Pycreus pidvinatus Nees in Linnaea IX (1834) p. 283. 



Cyperus pumilus Linn.! Amoen. Acad. IV (1758) p. 302 et Sp. 

 PI. ed. II p. 69; Kunth Enum. II p. 4 pro minore parte; nee Rottb. 

 nee Nees. 



. Oyperus nitens Retx. Obs. fasc. V (1789) p. 13? ; Kunth Enum. II 

 p. 3; Boeck. I in Linnaea XXXV (186768) j;. 483. 



Hab. in Martinique: Duss n. 477. 



Distrib. in Florida; in orbe vetere calidiore communis. 



