16 C. B. Clarke: 



Spicae in umbella simplice dispositae. 



Glumae mucronulatae . . . . 1. P. nitens Nees. 

 Glumae apice trianguläres, vix acutae 



11. P.helvus C.B. Clarke. 

 ** Robustior. Spiculae 5 mm. latae. ümbella 1 — 2 dm. lata 



/ 12. P. angulatus Nees. 



6. Pycreus flayescens 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 cellulis extimis, praesertim in humeris, 

 longitudinaliter oblongis. 



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

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

 (1867—68) 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 Y3 — ^5 pai'te glumae aequilonga, 

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

 quadrangulis. 



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

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



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



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

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

 nee Nees. 



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

 p. 3; Boeck. ! in Linnaea XXXV (1867—68) p. 483. 



Hab. in Martinique: Duss n. 477. 



Distrib. in Florida; in orbe vetere calidiore communis. 



