POACEAE | 113 
2-nerved, keeled and flattened, the keel between or at one side of the nerves.— 
Fourteen species, most of them North American.—MARSH-GRASSES. CORD- 
Leaf-blades more than 5 mm., us sually more than 8 mm. wide, flat (more or less rolled 
in drying) : plants robust, often tall and reed-like. 
First glume as long as the floret, slender-acuminate, the second with an awn about 
mm. long: spikes somewhat distant. 1. S. Michauaiana. 
First glume shorter than the floret, acute, the second acute or 
mucronate, but not slender-aw ned: spikes approximate. 
Spikes numerous, ascending, iorming a thick panicle. 2. S. cynosuroides. 
Spikes few to several, remote, erect or nearly so. 3. S. alterniflora. 
Leaf-blades Jess than 5 mm. broad, involute or soon becoming so: 
rather slen der. , 
Sp plan d g a dense cylindrical inflorescence 4. S. spartinae. 
Spikes S pra or appressed, but not closely: approximate 
Greening pA aE wanting : plant in a dense hard clump 
with Has jv "on ae nd long slender involute leaf- 
blades as muc IUBE 5. S. Bakeri. 
Creeping buie. ae plant more slender and with 
shorter blades. | 6. S. patens. 
S 2 m. tall: leaf-blades 60-120 em 
1. S. Michauxiana A. Hitche. Stem 1-2 m ; 
long, as muc a as 15 mm. wide, tapering to a very slender point: spikes 5-20, ap- 
pressed or ending, m ostly 4—8 em. long: 
pene ERU -hispid on the keel, the first 
acuminate, equalling the floret, the second 
longer than 2 floret, tapering into an awn 
mm. long: lemma 7-9 mm. long. [S. 
eynosuroides (Fl SE. S.) ]—(Srovazn- 
S.)—Marshes, river- banks, arid rS 
in prairies, various provinces, N. 
and N. J.. 
M., Wash., N. S., 
2. S. ee pu Roth. Stem 1- B 
ic 
as 
long as the lemma, the second longer than 
the lemma.  [S. polystachya Willd.]— (SALT REED-GRASS.)—Salt and brackish 
marshes, Coastal Plain and New England Coast, Fla. to La. and Me. 
3. S. ere ves Loisel. Stem rather 2 1-2 m. tall, leafy: leaf- bod 
ud. wide: spikes appressed, 5—15 e . lon ng: spikelets 10-14 mm. long, — 
eia alos ng the rachis, age PRAE rn glum e lemma sparingly 
pilos e first glume %4 as long as Ar ger the lemma 8-10 mm. long 
quum imbrieate, the eae a glabr n S. alterniflora "glab ra (S. "ous 
(Fl. SE. U. S.) S. glabra Muhl. T Salt. distin Coastal Plain and New Eng- 
land Coast, Fla. to Tex. and Me. 
4, S. spartinae (Trin.) Merr. Stem 0.3-1 m. tall, in dense hard clumps, the 
reds wanting: panieles 10—20 em. long, strict: spikes on mostly 
2-3 em. long: spikelets about 7 mm. long. [S. junciformis Engelm. & Gra a7] 
— Sandy marshes, cypress-ponds, pet alluvial flats, Coastal Plain, Fla. to 
—(Mema.) 
.5. S. Bakeri Merr. Stems in dense tufts: spikes few, 3—6 em. 128 appressed : 
first glume about 3 mm. long: second glume about 1 cm. long, acuminate: 
lemma about 6 mm. long, glabrous except the scabrous ih —Fresh water 
marshes, prairies, and borders of lakes, Coastal Plain, Fila. and Ga. 
