. Handbook of grasses, treating of their structure, classification, geographical distribution and uses, also describing the British species and their habitats. Grasses. 28 BRITISH SPECIES Poa pratensis, var. subccerulea, is a dwarf glaucous purplish form, found on wall-tops, dry heaths and mountains. Deschampsia caspitcsa, var. brevifolia ; leaves short, panicle much smaller than in the typical plant; dry uplands, mountains. The grasses fortaing our third group are semi-aquatic, growing in ditches, ponds and marshy places, and by the margins and streams. Alopecurus geniculatus, the F
. Handbook of grasses, treating of their structure, classification, geographical distribution and uses, also describing the British species and their habitats. Grasses. 28 BRITISH SPECIES Poa pratensis, var. subccerulea, is a dwarf glaucous purplish form, found on wall-tops, dry heaths and mountains. Deschampsia caspitcsa, var. brevifolia ; leaves short, panicle much smaller than in the typical plant; dry uplands, mountains. The grasses fortaing our third group are semi-aquatic, growing in ditches, ponds and marshy places, and by the margins and streams. Alopecurus geniculatus, the Floating Foxtail, is a very common grass all over Britain, in ditches, ponds and marshy places. Root- stock with decumbent and geniculate branches, rooting below, often floating. Leaves short with rough ribs, dull green. Culms about a foot high, sharply bent at the lower nodes. Panicle spikelike, cylindric and dense, much narrower than that of A. pratensis, and purplish-green. Spikelets y^ inch long, i-flowered; empty glumes awnless, united at the base and ciliated on the keel; flower- ing glume with a sub-basal awn nearly twice its length; no palea. Perennial, flowering early June to autumn. A. pronus is a prostrate form. Glyceriafluitans, the Floating Sweet- grass (fig. 22), almost invariably ac- companies the species last described, but is not confined to stagnant water, as it fringes the rivulets, and often floats in the current. Rootstock with- out subterranean stolons, but produc- ing stout procumbent or floating branches which root below. Leaves long, broadly linear, conduplicate at first, then flat, with faint ribs, flaccid, speckled in transmitted light; ligule prominent. Culms about 2 ft. Pani- cle long and slightly branched, the branches adpressed to the rachis, and some of them bearing only one spikelet. Spikelets about an inch long, cylindric at first, then linear and compressed, pale green, 12- to 15-flowered; glumes rounded on the back and awnless, the flowering o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgrasses, bookyear1910
