$80 GRAMINEJE. (GRASS FAMILY.) 
the joint ; lower glume ovate, obtuse, obscurely pitted in lines; sterile spikelet 
rudimentary. (Tripsacum cylindricum, Michr.) — Dry sandy soil, Florida. 
July - Sept. — Culms 19 -2? high. Spikes 2' — 6' long, 1" in diameter, purplish. 
54. MANISURIS, L. 
Annual grasses, with branching culms, flat leaves, and spiked inflorescence. 
Spikes lateral and terminal, clustered, jointed, the short peduncles enclosed in 
spathe-like sheaths. Spikelets 1-flowered, placed one at each end of the joints 
of the spike; the upper neutral, compressed, of two nearly equal hispid mem- 
branaceous glumes ; the lower perfect, globose. Glumes coriaceous, concave, 
the lower reticulated, the upper smooth. Pales 2, hyaline. Stamens 3. Grain 
included. 
1. M. granularis, Swartz. Leaves linear-lanceolate, and, like the sheaths, 
hairy; spikes 6” — 10” long; spikelets minute, turning black. — Fields and pas- 
tures, Florida to South Carolina. Aug. and Sept. Introduced. — Culms 1°- 
29 high. : 
i 55. TRIPSACUM, L. Gawa-Gnass. 
A tall perennial grass, with solid culms, broad and flat leaves, and spiked 
inflorescence. Spikelets awnless, moncecious, in jointed spikes, the upper ones 
staminate, the lower fertile, 2-flowered. Staminate flowers by pairs on each 
short triangular joint of the,slender rachis, 3-androus ; glumes 2, coriaceous ; 
pales hyaline. Pistilate spikelets single, embedded in a deep excavation of 
the thick and polished joints; the outer glume cartilaginous, concave, the inner 
membranaceous, boat-shaped ; lower flower neutral, the upper pistillate, both 
with hyaline palez. Anthers opening by terminal pores. Stigmas elongated. 
Grain free. 
1. T. dactyloides, L.— Rich soil, Florida, and northward. Aug. and 
Sept. — Culms erect, from tufted creeping rootstocks, 39 - 59 high. Leaves 1’ 
wide. Spikes 4/—8' long, on long lateral and terminal peduncles, 2-4 in a 
_ Cluster or sometimes solitary. (T. monostachyum, Willd.) 
56. ANDROPOGON, L. Broom-Grass. 
Coarse perennial grasses, with branching erect culms, long and harsh leaves, 
and spiked inflorescence. Spikes lateral and terminal, jointed. Spikelets by 
pairs on each joint of the slender commonly hairy or plumose rachis ; one ud 
them pedicelled and staminate, neutral, or rudimentary ; the other sessile, 2 
_ flowered, the lower flower consisting of one palea, and neutral; the upper of 
.. 2 pales, mostly perfect, shorter than the herbaceous or chartaceous gltinies, the 
Tower one mostly awned at the apex (except No. 1). Stamens 1-3. Grain free. 
WIE EK ANDROPOGON Pisis. = Upper Rom gh. 
