577 
GRAMINEiE. (GRASS FAMILY.) 
4. S. COmpreSSUS, Kunth. Very smooth, leafy to the to-p; 
culms tufted, stout , very fiat; sheaths flattened, much longer than the 
internodes; leaves erect , narrow, conduplicate-channelled; glumes 
acutish, about one third shorter than the obtuse paleae. 1J. (Agrostis 
compressa, Torr. Vilfa, Trin.) — Bogs in the Pine barrens of New 
Jersey. Sept. — Forming strong tussocks, 1°-2° high. Panicle 8'- 
12' long: spikelets 1" long, purplish. 
5. S* serdtinus* Smooth ; culms very slender, flattish (& -15' 
high), few-leaved; leaves very slender, channelled; panicle soon 
much exserted, the diffuse capillary branches scattered ; glumes ovate, 
obtuse, about half the length of the paleae. Q)? (Agr. and Vilfa se- 
rotina, Torr. V. tenera, Trin . Poa ? unifldra, Muhl. P. modesta, 
Tuckerm.) — Sandy wet places, E. New England to New Jersey: also 
in Michigan. Sept.— A very delicate grass; the spikelets, &c., 
smaller than in the last. 
? • AGROSTIS, L. Bent-Grass. 
Spikelets 1-flowered, in an open panicle. Glumes somewhat 
equal, or the lower rather longer, usually longer than the paleae, 
pointless. Paleae very thin, pointless, naked; the lower 3-5- 
nerved and frequently awned on the back, the upper often minute 
or wanting. Stamens chiefly 3. Grain (caryopsis) free. —Culms 
usually tufted, slender. (Name from aypos, a field, the place of 
growth.) 
§1. Trichodium, Michx.— Upper palea none, or obsolete. 
1. A. data, Trin. (Taller Thin-Grass.) Culms firm or 
stout (2°-3° high) ; leaves flat (l"-2" wide); upper ligules elongat¬ 
ed (2" - 3" long); spikelets croicded on the branches of the spreading 
panicle above the middle (1£" long) ; lower palea awnless, slightly 
shorter than the rather unequal glumes ; the upper wanting. 1J. (A. 
Schweinitzii, Trin. f A. altissima, Tuckerm., excl. var. laxa. Tricb. 
elatum, Pursh.) — Swamps, N. Jersey and southward. October. 
2. A. perennans. (Thin-Grass.) Culms slender, erect from 
a decumbent base (P-2° high); leaves flat (the upper 4'-6 / long, 1"- 
2" wide) ; panicle at length diffusely spreading, pale green , the branch¬ 
es short , divided and flower-bearing from or below the middle ; lower 
palea awnless (rarely short-awned), shorter than the unequal glumes; 
the upper minute or obsolete. 1J. (Cornucopice perennans, Walt. Trich. 
perennans, Ell. T. dechmbens, Michx. T. scabrum, Muhl., not Agr. 
scabra, Willd. Agr. anomala, Willd.) — Damp shaded places. July, 
Aug. — Spikelets, &e., as in No. 3, into which it appears to vary. 
3. A. scabra, Willd. (Hair-Grass.) Culms very slender, 
erect (l°-2° high); leaves short and narrow, the lower soon involute 
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