cxLT. ctpetiace.t:. 417 



rarely membranous. Stamens hyi)ocrynous, commonly 3 • but 

 varying from 1-12 ; anthers basiHxed, 2-ceI]ed, often ere'sted. 

 Ovary 1-celled ; style 2- or 3-iid ; sti-mas undivided or 2-fid. 

 ovule 1, erect l>uit an achene (sometimes enclosed in a ba-! 

 like enve ope) Embryo in the base of floury albumen.-The 

 true sedges. lufted or creeping- rooted plants, with terete 

 or more commonly 3-angled, solid culms; leaves with entire 

 (not split) sheaths, and variously arranged inflorescence. Found 

 in wet and dry j)laces in all parts of the world. 



(1) Flowers bisexual ; rarely a few male or female 

 intermixed. 

 Glumes 2-ranked (distichous). 

 Perianth 0. 



Spikelets many-flowered. 



Style filiform, not swollen at base. 



Achene destitute of circling disk . . 1 CrPEEFS 

 Achene in a lobed, top-shaped disk . 25.' HEMiCHLiENA 

 btyle with a much-swollen base, jointed 



SpikeTe*! "Srt^r"™'" ■■■■'■ ^— ">""- 



Style filiform, not swollen at base. 

 Achene destitute of encircHng disk. 

 Style 3-fid; spikelets in loosely 



tufted spikes or umbels . . . 2. Maeiscus. 

 btyle 2-hd; spikelets in densely 



compacted heads 3. KYLLixori 



Achene in a cup-hke triangular disk. 26. Acrolepis.' 

 Style with a swollen, bulb-like base. 



Stamens 3 (lower flowers male) . . 17. Lepisia 

 Stamens 5-8(or 3) (lower flowers male) 18." Elyxantuu^ 

 Perianth of bristles, scales, or tubular and 

 bearing bristles. 

 Perianth of bristles. 

 Style tuberous at base. 



Perianth of 8 long, hispid bristles; 



style long, 6-fid at apex . . . . I9. Bueeia 

 Perianth of 5, unequal, subhyaline 



bristles, 3 of them pubescent . . 20. Ideleuia 

 Perianth of 6, hispid or plumose bris- 

 tles ; style 3-fid . 21. ASTEROCII.ETE. 



btyle equal at base ; bristles 3-6, rou" h 



orpluniose . . ° . 24. Ch.etospora. 



Perianth of 3, narrow, 3-fid scales ; the lobes 



bristle-shaped I4. Trianoptiles. 



Perianth tubular, crowned with 6 capillary 



bristles ; spikelets 1-flowered .... 23. CrATHOCoMA. 

 U-lumes imbricated on all sides. 

 Perianth of bristles or scales. 

 Style tuberous at base. 



Culms leafless, bearing solitary, terminal 



spikelets . . 4. Elegcharis. 



Lulms leaty ; spikelets capitate, corym- 

 bose or panicled lo. RlIYNCnOSPORA. 



o 



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