TRIANDRTA. MONOGYXIA, 83 



Leptiiriis *pam'c7/Iafi/s, and oug-ht perhaps to be united 

 witli that genus as a subgeneric section. 



115. ROTBOLLIA. L, 



Flowers polye^amoiis. RacJiis articfilated, ry- 

 lihdiic, oCtm filiform; articulations 2 or more 

 flowered. — Calix ovate-laiK eolate, flat, I or 2- 

 valved. Corolla smaller, 2-valved. 



Spike mostly solitary, terminal; rarely axillary, or fasci- 

 culated, in a panicle. P'ioweis alternating- on a flexuose 

 or suuiated rachis. Hermaphrodite calix 1 -flowered, 1 

 or 2-valved; the exterior valve indurated, and cartilag-i- 

 rous, or coriaceous, growing- fir 'nly to the rachis, often 

 emarginate at the base, and closing- tlie depressed sinus 

 of" the joint, or scrobiculum like a lid; the cavity itself 

 often answering- the purpose of a second calicine valve. 

 In this g-eiius there is always more than a single flower 

 on each jo nt of ihe rachis, which is fragile 



Species. 1. li. dimidiatu? On the sea-coast of Carolina 

 and Georgia. 



- § n ApoGONiA. Articulations 2-flowered; flowers 

 awnless; the ht rmaphrodite sessile, with a 2-valved c-dlix, 

 the male or neuter pedicellate — Grasses cotisiderably 

 allied to .^ndvopogon, but with awnless glumes, and col- 

 lected into cylmdiic or filifoi-m spikes upon a scrobicu- 

 late or alternately excavated rachis. 



2. "ciliata. Culm er- cl, tall; spikes terete, upon long- pe- 

 tiunc'i'es, pedicellate flowers on one side of thr racliis, pe- 

 dicells and marg-in of the rachis villous; calix and corolla 

 each 2 valved. 



Culm erect, solid, compressed, very smooth, sometimes 

 with a few scattered hairs near the joints, 3 or 4 feet high, 

 not fragile at the joints, above and contiguous to the 

 branches, deeply g-rooved. Leaves long-, very narrow, 

 subulate, and acute, sharply and conspicuously serrulate 

 toviards the point; sheathes much shofiet^ than the inter- 

 nodes; stipules minute, smooth. Axillary branches ter- 

 minating in a single spike sp kes 4 or 5, more or less, 3 

 or 4 inches long, subcyhndric, a little compressed, with 

 the pedicellate male or neuter flowers on one side; rachis 

 slender, flat, and externally villous, fragile at the joints. 

 Calix 2-valved, 1-flowered; the hermaphrodite sessile, the 

 masculine or neuter pedicellate; outer valve of the her- 

 maphrodite calix linear-lanceolate, acute, scabrous on the 

 margin, cai'tilaginous and polished, often minutely bifid 



