_Deschampsia cæspitosa_--_Aira cæspitosa_ _Deschampsia flexuosa_--_Aira flexuosa_ _Digitaria_--_Panicum_ Digitate--spread out like fingers, _15_ _Digraphis_--Reed-grass, 6, 11, 13, 26, 40, 41, 51, 55, 69, 73, 75, 90, 91, 92, 103, 131, 139, 146, 159; _D. arundinacea_, 6, _16_, _23_, 29, 32, +54+, 64, +75+, +103+, +139+, 150 Dimensions of grasses, 6 _Dinochloa_, 6 Diœcious, unisexual, the male and female flowers being on separate plants, 119 Disarticulation of fruits, _124_ Dissemination, 125, 127 Distichous--in two ranks on the axis, 106 Distribution of grasses, 2, 37, 38 Distribution of seeds, 124-127 Distribution of sexes, 119 Ditches, grasses of, 28, 29 Dog’s-tooth grass--_Cynodon Dactylon_ Dorsal awn, 92, 112, 116, 130, 159 Double seed--grass “seed” where the remains of a second flower come away with the first, _152_, _153_ Downs, grasses of, 29 Downy Oat--_Avena pubescens_ Dry leaves, 21 Dry situations, 24, 26, 29 Dry soils, 29, 32 Duration, 10 Dwarfed species, 6 Early Hair-grass--_Aira præcox_ Ears, _19_, 22, 57, 59 _Echinochloa_--_Panicum_ Effects of grasses on soil, 35, 36 Egg-cell, 121 _Eleusine_, 123 Elliptical shoot-section, 16, 44 _Elymus_--Lyme-grass, 6, 13, 14, 21, 22, 25, 36, 48, 57, 63, 65, 69, 79, 90, 92, 102, 170; _E. arenarius_, 6, 29, 33, 35, 36, +48+, 66, _67_, +108+, +149+, _150_ Embryo, 121, 131, 133 Embryo-sac, 121 Embryonic bud--plumule, 123 Embryonic roots, 123, 133 Endosperm, 120, _121_, _122_, 123 Energy stored in leaves, 2, 3 Entire--not cut: with unbroken outline, 19 Entire sheath, 17 Entire-sheathed grasses, 17, 39, 113, 115 Epidermis, 25, 36, 62-67, 70, 76, _122_ Equitant--one folded leaf straddling over another, 39, 41 _Eriophorum_, 3 Extra-vaginal shoots, 12 False Oat--_Arrhenatherum avenaceum_ Female flowers, 89 Fertile flowers, 86, 89, 90 Fertilisation--the fusion of the nucleus of the pollen-tube with that of the egg-cell, 121 Fescue--_Festuca_, 115, 130, 137, 144, 148, 151, 172