TRIANDRIA. MONOGYNIA. 85 
Lepturus *paniculatus, and ought perhaps to be united 
with that genus as a subgeneric section. 
115, ROTBOLLIA. L. x 
Flowers polygamous. Rachis articulated, cy- 
lindric, often filiform; articulations 2 or more 
flowered.—Calix ovate-lanceolate, flat, 1 ur 2- 
valved. Corolla smaller, 2-valved. . 
Spike mostly solitary, terminal; rarely axi!larv, or fasci 
culated, in a panicle. Flowers alternating on a flexuose 
or Sinuated rachis. Hermaplrodite calix 1-flowered, 1 
or 2-valved; the exterior valve indurated, and cartilagi- 
nous, or coriaceous, growing firvily to the rachis, often 
emarginate at the base, and closing the depressed sinus 
of the joint, or scrobiculum like a lid; the cavity itself 
often answering the purpose of a second calicine valve. 
+. In this genus there is always more than a single flower 
on €xch joint of the rachis, which is fragile. : 
Species. 1, 72, dimidiata? On the sea-coast of Carolina 
and Georgia. : al 
§11 APoconta. Articulations 9-flowered; flowers 
awnless; the hermaphrodite sessile, with a 2-valved culix, 
the male or neuter pedicellate—Grasses ‘considerably 
allied to Andropogon, but with awnless glumes, and col- 
lected into cylindric or filifurm spikes upon a scrobicu- 
late or alternately excavated rachis. 
2. *ciliata. Culm erect, tall; spikes terete, upon long pe- 
duncies, pedicellate flowers on one side of the rachis, pe- 
dicells and margin of the rachis villous, calix and corolla 
each 2-valved. pon 
Culm erect, solid, compressed, very smooth, sometimes 
with a few scattered hairs near the joints, Jor 4feet high, — 
not fragile at the joints, above and oe to the 
branches, deeply grooved. Leaves long, very narrow, 
subieicie kaa py sharply and conspicuously serrulate 
towards the point; sheathes much shorter than the inter- 
* nodes; stipules minute, smooth. Axillary branches ter- 
minating in a single spike: spikes 4 or 5, more or less, 3 
or 4 inches long, subcylindric, 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-lanccolate, acute, scabrous on the 
Margin, cartilagmous and polished, often minutely bifid 
