_Andropogon_, 4, 27 Andropogoneæ, 122 Animal-distribution of seeds, 125 Animals killed by grasses, 127 Annual Beard-grass--_Polypogon monspeliensis_ Annual grasses, 10, 11, 37, 43, 59, 114 Annual Meadow-grass--_Poa annua_ Anther, _93_, 94, 119 Anthesis--the period of opening of the flower, 96 _Anthoxanthum_--Vernal grass, 11, 13, 22, 26, 27, 36, 56, 58, 60, 83, _87_, 88, 90, 91, 94, 97, 110, 119, 124, 136, 152, _154_; _A. odoratum_, 7, 28, 32, 33, 34, +57+, +76+, +102+, +103+, +154+; _A. Puelii_, 67, 154 Anti-ligular peg, 41 _Apera--Agrostis_; _A. Spica-venti_--_Agrostis Spica-venti_ Apex of leaf, 19, +21+, +22+ Apogamy, 134 Appressed hairs, 65 Aquatic grasses, 27, +28+, 39, 62, 103, 111, 112, 113 Arctic species, 37 _Aristida_, 36; _A. hygrometrica_, 127 _Arrhenatherum_--False Oat, 6, 11, 13, 14, 17, 26, 32, 55, 56, 58, 60, 61, 66, 89, 90, 91, 92, 119, 152, 155, 157; _A. avenaceum_, 6, 8, 25, 28, 33, 34, +56+, 66, +77+, _93_, +106+, _129_, +157+ _Arundo_--Reed, 11, 14, 19, 20, 37, 40, 68, 69, 90, 91, 93, 103, 125, 130, 131, 139, 146, 171; _A. Donax_, 21, 75; _A. Phragmites_, 2, 6, 29, 32, 40, +51+, 55, 66, +75+, +138+ Asperities--minute stiff hairs giving roughness to the touch, 24, 45, 65, 66, 75, 77, 127 Auricles--ear-like projections at base of leaf-blade, 22, 133 _Avena_, _5_, 15, 21, 23, 47, 54, 56, 88, 89, 90, 91, 92, 95, 104, 106, +116+, 117, 125, 127, 138, 155, 157, _158_; _A. alpina_--var. of _A. pratensis_; _A. elatior_--_Arrhenatherum avenaceum_; _A. fatua_, 28, 77, +117+, +156+, 157; _A. flavescens_, 7, 11, 13, _18_, 26, 28, 56, +60+, 61, +81+, +117+, +158+, 161; _A. pratensis_, 7, 11, 14, 20, 21, 22, 25, 27, +47+, 56, 61, 63, 66, 81, +117+, 156, +157+; _A. pubescens_--var. of _A. pratensis_, 16, 26, 27, 32, 33, 56, +61+, 68, +157+; _A. strigosa_--var. of _A. fatua_ Aveneæ, 122 Awn, 91, 92, +95+, 99-118, +125+, _126_, 127, _128_, _129_, +130+, _131_, 142, 144, 151, 153, 154, 159, 160, 162, 163, _164_, 166, _167_, 168, _169_, _170_, 171, _173_ Awned grasses, +92+, 99-101, 102, 103, 104, 105, 106, 107, 111, 112, 113, 114, 115, 116, 117, 151-174 Awned Nit-grass--_Gastridium lendigerum_ Awnless Brome--_Bromus inermis_ Awnless grasses, +93+, 104, 105, 107, 108, 109, 110, 111, 112, 138-151 Awn-point, 114, 115, 116, _123_, 131, _150_ Ballast plants, 30 Bamboos, 1, 5, 6, 37, 38, 96, 97, 123 _Bambusa_, 96 Barge-shaped “seeds,” 128, 163, _164_, 168 Barley--_Hordeum_, 120, 132, +133+, 163 Barley-type of “seed,” 138, 162 Barren Brome--_Bromus sterilis_ Barren flowers, 86, 89, 90, 99, 100 Basal-awn, 92, _128_, _129_, 130, 159 Basal hair-tufts, 138, _158_, 159, 160, 161 Base of leaf, _18_, _19_, 20, 22 Bast-sclerenchyma, 70 Bearded Darnel--_Lolium temulentum_ Bearded Wheat-grass--_Agropyrum caninum_