562 GRAMINEÆ.. (GRASS FAMILY.) 
on leafless radical culms ; lower palea (6" long) ovate-lanceolate, smooth, fringed 
on the margins, awn-pointed. (Arundo tecta, Walt.) — Swamps, Florida to 
North Carolina. Feb. and March. 
30. BRIZOPYRUM, Link. 
A low and rigid perennial dicecious grass, growing in saline marshes, with 
linear-subulate involute distichous leaves, and many-flowered compressed spike- 
lets, crowded in a nearly simple spike. Glumes and palez smooth, somewhat 
coriaceous, obtuse, compressed, not keeled ; the lower ones several-nerved. Sta- 
mens 3. Stigmas 2. Grain oblong, free. 
1. B. spicatum, Hook. Rootstocks long and creeping; culms 1° high ; 
leaves spreading, rigid, 2/— 4! long, smooth, like the imbricated sheaths ; spike- 
lets oblong, 7—15-flowered. (Uniola spicata, Ell.) — Low sandy shores and 
marshes, West Florida, and northward. Aug. and Sept. 
81. POA, L. Mzrarnow-Gnass. 
Grasses with tufted culms, smooth flat and tender leaves, and compressed few- 
flowered spikelets in loose or contracted panicles. Glumes unequal, shorter 
than the flowers. Lower palea nearly membranaceous, keeled, scarious on the 
margins, awnless, 5-nerved, the three more prominent nerves mostly hairy or 
woolly below; upper palea 2-toothed, falling at maturity with the lower one. 
Stamens 2-3, Stigmas plumose. Grain free. 
* Branches of the panicle single, or by pairs. 
1. P. annua, L. Annual; culms tender, spreading, 6-10! high; leaves 
linear, 3’~6/ long, 1}” wide; panicle ovate, the smooth branches at length 
reflexed ; spikelets ovate, about 5-flowered ; glumes obtuse or emarginate, half 
as long as the sparsely hairy obtuse flowers. — Yards and gardens, Po and 
northward. Feb. and March. Introduced. 
2. P. cristata, Walt.? Annual; culms erect, 6/ — 10' high; leaves linear, 
subulate, 1/ long, 1 wide; panicle linear or lanceolate, dense, the lowest of the 
rough branches padig spikelets 3 -5-flowered ; lower palea with a promi- 
nent crest-like fringe on the back, barely longer than the acute glumes.— Dry ; 
soil around Quincy, Middle Florida. April. 
3. P. flexuosa, Muhl. Perennial; culms weak, mostly erect, 1°- ap 
high; leaves narrowly linear; branches of the panicle by pairs (13 - z* long), 
cua widely spreading ; spikelets 2 — 4 near the summit of each branch, pale, 
3 - 4-flowered ; glumes acute; lower palea compressed and very obtuse 
at the apex, hairy on the nerves. (P. autumnalis, Ell.) — Rich shaded soil, 
