Giant Fescue--_Festuca gigantea_ Girders--supporting bands of sclerenchyma running in the principal ribs and ridges, _63_, _64_, 65, _66_, _67_, +68+, _69_, 70, 71, 74-80 Glabrous--devoid of hairs, 18, 19, 22, 26, 45, 48, 80, 168 Glaucous--pale sea-green, usually due to a waxy bloom, 22 Glume, 85, 86, _87_, +91+, +92+, 93, +94+, 95, 99-118, 124, 125, 127, 130, 134, 135, 136, 151, _152_, _153_, _154_, _155_, 156 _Glyceria_--Sweet-grass, 6, 14, 20, 21, 37, 40, 54, 67, 90, 91, 92, 136, 137, 138, 146, 148; _G. aquatica_, 6, 11, 16, 17, 25, 26, 28, +39+ 54, 69, +73+, 103, 111, 112, +113+, 142, +145+; _G. distans_--_Poa distans_; _G. fluitans_, 6, 11, 16, 17, 25, 28, 32, +39+, 40, 54, 64, 66, 69, +73+, +111+, 113, _128_, +145+; _G. maritima_--_Poa maritima_; _G. procumbens_--_Poa procumbens_; _G. rigida_--_Poa rigida_ Grain, 86, 95, 121, _122_, 127, 135 Graminaceæ, characters, 3, 36, 37 Gramineæ, _see_ Graminaceæ Grass, origin of the word, 3 Grass carpets, 2, 37 Grasses, identification of, 3, 4 Grazing, 27 Grey Hair-grass--_Aira canescens_ Grooved leaf, _69_, 70, _71_, 79 Grooved sheath, 18 _Gynerium_, 89 Habit, 13, 34 Habitats, 27-31 Hair-grass--_Aira_ Hairs, _18_, 19, 21, 24, 26, 62, 64, 66, 67, 91, 125, 130, 131, 138, 139, 144 Hair-tufts, 59, 123, 125, _129_, _158_ Hairy grasses, _18_, 19, 21, 22, _23_, +26+, 57, 76, 81 Hairy Brome--_Bromus asper_ Hairy “seeds,” 168 Half-shade species, 34 Halophytes, 36 Hard Fescue--_Festuca duriuscula_ Hard-grass--_Lepturus_ Hard leaves, 21, 47 Hard Meadow-grass--_Poa rigida_ Hardy Bamboos, 38 Hare’s-tail--_Lagurus_ Harsh leaves, 21 Haulm, 83 Havers--_Avena fatua_ Hay, 27, 37 Heath False-Brome--_Brachypodium pinnatum_ Heath-grass--_Triodia decumbens_ Heath-grasses, 20, +29+, 36 Height, 6 _Heleochloa_, 123 Herbaceous--of the ordinary soft texture of herbs, 6, 21, 91 _Heterodera_, 10 Heterophylly, 71 _Heteropogon contortus_, 127 _Hierochloe_--Holy-grass, 20, 27, 66, 73, 91, 92, 105, 155; _H. borealis_, 30, 65 Hill-pastures, 29 Hispid--covered with stiff and rather long hairs, 58 Histology, 62-71, 122 _Holcus_--Soft grass, 8, 22, 26, 27, 56, 89, 90, 91, 93, +106+, 119, 125, 148, 151, _152_, _153_, 155; _H. lanatus_, 7, 11, 13, 14, 17, _23_, 26, 28, 30, 32, 34, +59+, 65, 69, +81+, +106+, 143, 151, +152+; _H. mollis_, 11, 28, 30, 33, 59, +106+, +153+ Holy-grass--_Hierochloe_ Hooded leaf-apex, 21 Hook-hairs, 65