TRIANDRIA. MONOGTNIA. 83 



Lepturns *panicidati/s, and ought perhaps to be united 

 with that genus as a subgeneric section. 



115. ROTBOLLIA. L, 



Flowers polvj^amous. Rcichis aftiriilated, ry. 

 liridiic, ()tt< n filiform; articulations 2 or more 

 flowered. — Calix ovate-lanceolate, flat, 1 or 2- 

 \alved. Corolla smaller. 2-valved. 



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

 culated, in a panicle. Flowers alternaun^- on a flexuose 

 or sinuated rachis. Hermaphrodite cahx 1 -flowered, 1 

 or 2-valved; the exterior valve indirated, and cai-tilag'i- 

 nous, or coriaceous, gi-owing- fir'^Jy to ilie rachis, often 

 emarg'inate at the base, and closin,^ the depressed sinus 

 of the jointi or scrobiculum hke a lid; tiie cavity itself 

 often answering" the purpose of a second calicine valve. 

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

 on each joint of ihe rachis, which is fragile. 



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

 and Georgia. 



§11 Apogonia. Articulations 2-flowered; flowers 

 awnless; tlie hermaphrodite sessde, with a 2-valved calix, 

 the male or neuter pedicellate — Grasses considerably 

 allied to Andropogon^ but with awnless ;<lumes, and col- 

 lected into C}liiidric or filiform spikes ujjon a scrobicu- 

 late or alternately excavated rach.s. 



2. * ciliata. Culm er ct, tall; spikes terete, upon long pe- 

 duncles, pedicellate flowers on one side of the rachis, pe- 

 dicells and margin of the rachis villousi calix and corolla 

 each 2 valved. 



Culm erect, solid, compressr-d, very smooth, son^etimes 

 with a few scattered' hairs near the jomfs, 3 or 4 ieet high, 

 not fragile at the joints, ab^ ve and contiguous to the 

 branches, deeply grooved. Leaves long, vtry narrow, 

 subulate, and acute, sharply and conspicuou!^ly serrulate 

 towards the point; sheathes much shorier thivu the inter- 

 nodes; stipules minute, smooth. Axillary bianches ter- 

 minating in a single spike- spkes 4 or 5, more or less, 3 

 or 4 inches lon,!<, subcylindnc, a litiie compressed, with 

 thf pedicellate male or neuter flowers on one side; rachis 

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

 Calix 2-valved, l-flowt- red; the hermaphrodite stssne, the 

 mascidine or neuter pedicellate; outer valve oi' the her- 

 iTK-p'irodite calix linear-ianc oiate, acute, scribrous on the 

 ttaigi.i, cartilaginous and polished, often minutely bitid 



