Holcus lanatus L.
Yorkshire fog
Tufted, sometimes stoloniferous, softly hairy, greyish green perennials, 35-110 cm. Leaf-sheath firmly membranous, striate, ± keeled above near ligule, villous with long, fine, silky hairs, basal sheaths often purplish. Ligule (0.6)-1-3 mm, ± truncate, denticulate, apex finely ciliate and occasionally with a few long hairs, abaxially villous. Leaf-blade (2.5)-4.5-15-(20) cm × (1.5)-3-10 mm, pubescent and with longer soft hairs, narrowed to acuminate tip; margins finely ciliate, and with longer hairs. Culm erect, or ascending from geniculate base, nodes and internodes pubescent. Panicle 4-18 × 1.5-7 cm, lanceolate, ovoid or sometimes oblong, dense to lax, erect or nodding; rachis and branches pubescent. Spikelets 3.8-5.5 mm, whitish, pale green, or purplish. Glumes stiff-ciliate on keels and lateral nerves of upper glume, elsewhere minutely scabrid to shortly pubescent; lower sometimes slightly shorter, narrow-lanceolate, acute to mucronate, upper broader, elliptic, mucronate, or awned to 0.8 mm. Lemma 2-2.7 mm, elliptic-lanceolate, glabrous, shining, keel sparsely finely prickle-toothed, apex minutely ciliate-scabrid; lower lemma awnless, upper lemma narrower, awn stout, 1.4-2.8 mm, inserted c. 0.4 mm below tip of lemma, becoming recurved and uncinate. Palea keels sparsely short-ciliate above, apex obtusely lobed, minutely ciliate. Callus hairs few, to 1 mm. Rachilla glabrous. Anthers 1-2.2 mm. Caryopsis 1-1.5 × 0.4-0.5 mm.
N.; S.: throughout; St.; K., Ch., A., C. Roadsides, waste land, pasture and grassland, along tracks or streams in forest, often in damp or swampy ground; sea level to montane, rarely subalpine.
Naturalised from Europe.
