CYPERACE^E. (SEDGE FAMILY.) 559 



* * Nut reticulated : disk of 3 flattened lobes: stamens 2. 



3. S. reticularis, Michx. Culms slender (1- 1 high), scabrous be- 

 low; leaves narrowly linear; spikes clustered, axillary and terminal, the 

 lateral ones on a short erect peduncle ; nut globose, small, reticulated and 

 pitted ; lobes of the disk appressed to the base of the nut. Margins of ponds, 

 Florida and northward. August -Sept. 



4. S. Torreyana, AValpers. Culms weak, rough on the angles ; leaves 

 linear, obtuse ; spikes separate, the axillary ones on a long and drooping 

 peduncle ; nut globose, wrinkled and somewhat hairy, obscurely pitted ; lobes 

 of the disk appressed to the nut. Damp pine barrens, Florida, and north- 

 ward. August - Oct. Culms 1- H long. Nut l" - 2" in diameter. 



* * * Nut wart i/ : disk bearing 3-6 globular lobes : stamens 3. 



5. S. ciliata, Michx. Culms slender, rigid (l-2 high), smooth below, 

 sparingly fringed on the angles above; leaves 2, narrowly linear (1" wide), 

 rigid, smooth, or with scattered hairs on the margins ; sheaths pubescent ; 

 clusters terminal ; sterile spikes large, many-flowered ; nut globose, pointed, 

 closely beset with unequal warts, these corresponding to the angles of the nut 

 and at the base larger than the rest ; lobes of the disk 3, globular, entire. 

 Dry pine barrens. Florida to South Carolina. June -August. Rhizoma 

 thick and creeping. 



6. S. Elliottii, Chapm. Culms stout (|-1 high), densely rough- 

 fringed on the angles throughout ; leaves 3-4, broadly linear (2" -3" wide), 

 closely fringed on the margins and midrib beneath ; sheaths pubescent ; clus- 

 ters 2, the lateral one remote, on a short erect peduncle ; sterile spike small, 

 few-flowered ; nut globose, deeply wrinkled or pitted, and with slender warty 

 projections at the base; lobes of the disk 3, globose, 2-lobed. (S. hirtella, 

 Ell.) Low pine barrens, Florida to North Carolina July. 



7. S. pauciflora, Muhl. Smoothish or hairy or villous throughout; 

 culms (6' - 12' high) slender ; leaves narrowly linear ; clusters small, of I - few 

 spikes, terminal, and also a remote axillary one on a short erect peduncle ; 

 sterile spike few-flowered ; nut globose (small), pointed, closely beset with 

 minute warts, these at the base elongated ; lobes of the disk 6, distinct, globose. 

 (S. Caroliuiaua, Willd., the villous form.) 



Var. glabra. Smooth throughout, or the leaves and bracts scabrous at 

 the summit; culms erect (1 high), rigid, but slender, like the erect leaves; 

 clusters terminal ; spikes many-flowered ; lobes of the disk 3, each 2-lobed. 

 This also varies, with longer (2-2|) diffuse culms, and with 1-2 distant 

 axillary clusters on long (5' -10') drooping peduncles. Low sandy pine 

 barrens, Florida, and northward; the varieties chiefly southward. May- 

 August. 



2. HYPOPORUM. Disk none : nut concave and often pitted at the sides of 



the triangular base. 



* Clusters of spikes terminal, feafi/-bracted. 



8. S. Baldwinii, Torr. Culms rough above (2 -3 high) ; leaves mostly 

 2, linear, rigid ; nut large (2" long) dull white, globose-ovate, obscurely angled, 



