The only similar grass is Glyceria aquatica, Sm. which differs in its more reed-like habit, open panicle, and fewer flowers.
‡‡ Small land-plants not more than a foot high, with short, stiff, somewhat crowded panicles, and spikelets containing 6-8 flowers.
≡ Maritime perennial with creeping stolons, and about a foot high: panicle somewhat open below.
Poa maritima, Huds.
≡ ≡ Inland plant with secund panicle, about six inches high.
P. rigida, L.
The rare P. procumbens, Curt. and P. bulbosa, L. also come here, as well as starved forms of P. compressa, L. Some forms of Festuca elatior, var. pratensis, Huds. growing in dry situations may give trouble, and will have to be examined with the flora. See also note, p. [109].
†† Spikelets awned.
⊙ Awns bristle-like and terminal on the paleæ: flowers about six in each spikelet. Leaves setaceous. Panicle secund.
≡ Awns long and bristle-like. An annual weed.