British grasses and their employment in agriculture . ? - : ??&...Fig. 38. A large dense tuft of Aira cmspitosa, Seeds about 2-5 mm. long; outer palea membranous, white,and ragged at its apex, and bearing a fine, almost straight basal(or almost basal) awn seldom exceeding its own length. Rachillarelatively long, and bearing long white spreading hairs. There isalso a basal tuft of white silky hairs. Colour variable. (Fig. 40.)Airaflexuosa, L. (Wavy Hair-grass.) (Fig. 42.)A perennial, with narrow leaves having their edges tightlvrolled inwards, making them almost solid. Ligule prominent,broader
British grasses and their employment in agriculture . ? - : ??&...Fig. 38. A large dense tuft of Aira cmspitosa, Seeds about 2-5 mm. long; outer palea membranous, white,and ragged at its apex, and bearing a fine, almost straight basal(or almost basal) awn seldom exceeding its own length. Rachillarelatively long, and bearing long white spreading hairs. There isalso a basal tuft of white silky hairs. Colour variable. (Fig. 40.)Airaflexuosa, L. (Wavy Hair-grass.) (Fig. 42.)A perennial, with narrow leaves having their edges tightlvrolled inwards, making them almost solid. Ligule prominent,broader than the base of the leaf. Flowers in July; culms from 58 Botanical Section [FT I 12 to 18 inches high; panicle erect and spreading; spikelets erect,shining, containing two flowers. Generally distributed over Britainon heaths and upland pastures. Seeds 4-5 mm. long, of pale to mid-brown colour whenripe; outer palea ragged or bifid at its apex, and bearing a twisted. Fig. 39. Panicle of Aim ccespitosa, about J nat. size. and kneed basal (or almost basal) awn distinctly longer thanitself. A conspicuous tuft of white silky hairs surrounds thebase of the seed. Eachilla relatively short, also bearingwhite hairs. (Fig. II.) Aira canescens, L. (Grey Hair-grass.) Needle-like leaves; awn basal, thickened at end, and bearing ch. vn] Botanical Description of Species 59 a tuft of hairs in the middle. Id Britain, only known to occuron the sandy shores of East ADglia. Aira caryophyllea, L. (Silvery Hair-grass.) (Fig. 42.) An annual, with rather rough needle-like leaves, growingabout six inches high, and found mostly on poor uplands. Panicle erect and spreading; spikelets containing two flowers,the empty glumes equal. Seed dark-brown or almost black; about 1-5 mm. long,with a basal hair-tuft. Outer palea bifid at its apex, and bearinga dorsal (or almost basal) twisted and kneed awn about twiceits own length. (Fig. 43.)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, booksubjectgr
