CYPEEACEAE. 33 



9. R. miliacea (Lam.) A. Gray. Stems loosely tufted, 6-15 dm. tall: leaf- 

 blades 3-8 mm. wide: spikelets numerous, ovoid, 2.5-3 mm. long, peduncled, 

 in 6-8 open spreading corymbs: achene-body lenticular, obovoid or oval, fully 

 1 mm. or rarely nearly 1.5 mm. long, pale, transversely wrinkled; tubercle 

 smooth, depressed-conic, exceeding the bristles. Everglades. (Cuba.) 



10. R. stipitata Chapm. Stems tufted, 8-10 dm. tall: leaf-blades conspicu- 

 ously elongate, 4-10 mm. wide: spikelets 7-8 mm. long, narrowly ovoid, 

 numerous, in 4-5 compound drooping corymbs: achene-body lenticular, orbicu- 

 lar-obovoid, stalked, about 1.5 mm. long, finely transversely wrinkled, less than 

 i as long as the bristles; tubercle depressed, setose. Everglades and low pine- 

 lands. (Ber.) 



13. SCLERIA Berg. Caulescent herbs. Spikelets small, clustered in 

 terminal, or in terminal and axillary fascicles, or sometimes interruptedly 

 glomerate-spicate. Flowers monoecious. Fertile spikelets 1-flowered. Stami- 

 nate spikelets many-flowered. Scales imbricate. Perianth none. Ovary sup- 

 ported by a disk (hypogynium), or this wanting. Achenes globose or ovoid, 

 obtuse, crustaceous or bony, white in our species. NUT-RUSH. 



Inflorescence of 1 or several terminal or lateral clusters : plants perennial 

 Inflorescence a single terminal cluster : hypogyninm wanting. 

 Achenes 2-3 mm. long, obtuse, with 2 pits In each side 



of the 3-angled base. 1. 8. gracilis. 



Achenes 4 mm. long, acute, without pits. 2. 8. Baldwinii. 



Inflorescence of terminal and axillary clusters. 

 Achene smooth. 



Hypogynium present, 3-angled : leaf-blades 3-9 mm. 



wide. 3. 8. triglomerata. 



Hypogynium wanting : leaf-blades 1.5-2.5 mm. wide. 4. 8. lithosperma. 

 Achene reticulate, ridged or papillose. 



Achene reticulate or irregularly ridged. 5. 8. setacea. 



Achene papillose. 



Hypogynium supporting 3 entire emarginate or 2- 



'lobed tubercles. 0. S. ciliata. 



Hypogynium supporting 6 distinct tubercles. 7. 8. pattciflora. 



Inflorescence interruptedly glomerate-spicate : plants annual. 8. 8. verticillata. 



1. S. gracilis Ell. Perennial. Stems very slender, 2-4 dm. tall, smooth: 

 leaf -blades involute, filiform, smooth: achenes ovoid, 2-3 mm. long, obtuse, 

 shining or dull, distinctly ribbed lengthwise, with 2 pits on each side of the 

 triangular base. Everglades. ( Cub a. ) 



2. S. Baldwinii Steud. Stems relatively stout, 3-10 dm. tall, often rough 

 above: leaf-blades linear, 2-5 mm. broad, or sometimes narrower, smooth or 

 somewhat scabrous: achenes ovoid, about 4 mm. long, smooth and even (longi- 

 tudinally ribbed in 8. Baldwinii costata), dull, apiculate, obscurely triangu- 

 lar, without pits at the triangular base. Pinelands. (Cuba.) 



3. S. triglomerata Michx. Stems 4-10 dm. tall: leaf -blades flat, glabrous or 

 nearly so, 3-9 mm. wide, the upper attenuate: achenes ovoid or ovoid-globose, 

 above the hypogynium, obtuse, bony, obscurely 3-angled, smooth, bright-white, 

 shining, about 2 mm. high; hypogynium low, obtusely triangular, papillose- 

 crustaceous. Pinelands. 



4. S. lithosperma (L.) Sw. Stems 3-6 dm. long: leaf -blades narrowly linear, 

 1.5-2.5 mm. wide, with scabrous-ciliate margins and keel; achenes obwoid or 

 oblong, about 1.5 mm. long, smooth and glossy, without pores; hypogynium 

 wanting. Hammocks. (Bah., Cuba, Ant.) 



5. S. setacea Poir. Stems sometimes spreading, 2-7 dm. long, smooth: 

 leaf-blades linear, 2-4.5 mm. wide, usually with cartilaginous marginal ribs, 

 rather abruptly pointed: bracts glabrous: achenes globose or slightly de- 

 pressed above the 3-lobed appressed hypogynium, 2-2.5 mm. in diameter, regu- 

 larly reticulate, somewhat pubescent. Pinelands. (Cuba, Ant.) 



Flora of Miami 3 



