[Footnote 13: In cases where the “seed” has fallen from the glumes the sample will usually show some of the latter lying loose.] INDEX, GLOSSARY AND LIST OF SYNONYMS. Figures in bold type (+25+) refer to pages whereon the species or subject is more particularly dealt with; figures in italics (_25_) refer to pages containing illustrations. Achene, 123 Acicular--bristle-like Acuminate--tapering to a long point, 21, 139, 146, 147 Acute--simply pointed, 19, 21 Adaptations, 20, 24, 36, 37, 70, 124, 125, 132 Adventitious roots, 8, 131 Agriculture, 2, 3 _Agropyrum_--Wheat-grass, 11, 14, 22, 25, 26, 36, 49, 50, 51, 57, 69, 88, 90, 91, +106+, 107, 108, 144, 150, 167, 170, 171; _A. caninum_, 7, 21, 28, 34, +57+, +80+, 92, +107+, 150, 168, _169_, +170+; _A. junceum_--var. of _A. repens_, 21, 29, 33, 35, 36, 57, _66_, +81+, 102, 107; _A. repens_, 7, 30, +57+, +80+, 81, 93, 102, +106+, 149, +150+, _169_, +170+ _Agrostis_--Bent-grass, 7, 15, 22, 25, 49, 50, 51, 52, 53, 57, 82, 88, 89, 91, 103, +104+, 105, 112, 118, 125, 136, 137, 141, 144, 145, 159, 160, +161+; _A. alba_, 7, 11, 13, 14, 28, 29, 32, 33, 34, 51, 52, 69, 92, +104+, 144, +145+, 162; _A. canina_, 7, 11, 20, 28, 29, 37, 51, 52, +104+, 161, +162+; _A. setacea_, 31, 104, 161, +162+; _A. Spica-venti_, 31, 104, _130_, 161, +162+; _A. stolonifera_--var. of _A. alba_, 14, +51+, 52, 104, +145+; _A. vulgaris_--var. of _A. alba_, 29, 51, 52, 66, 104, +145+ _Aira_--Hair-grass, 6, 20, 21, 36, 48, 88, 89, 90, 91, 103, 104, 105, 106, 110, 112, +117+, 118, 125, 127, 138, 141, 144, 145, 159, 162; _A. alpina_--var. of _A. cæspitosa_; _A. canescens_, 8, 11, 14, 32, +47+, 66, 78, 91, 112, +159+; _A. caryophyllea_, 8, 10, 14, 29, 32, +46+, +118+, +160+; _A. cæspitosa_, 6, 11, 14, 22, 23, 25, 28, 33, 37, 41, +47+, 48, 63, _65_, 68, 69, +77+, 104, 106, +117+, _128_, 160, +161+; _A. flexuosa_, 7, 11, 14, 29, 33, 34, +46+, 68, 70, _71_, +79+, +118+, 158, +160+, _161_, 171; _A. montana_--var. of _A. flexuosa_; _A. setacea_--var. of _A. flexuosa_; _A. præcox_, 8, 10, 29, 30, 32, +47+, 91, +112+, 160 Air-spaces, 21, 39, 40, 62 Aleurone layer, _121_, _122_, 123 _Alopecurus_, 25, 53, 55, 88, 89, 90, 93, +101+, 109, 110, 119, 124, 152, 153, 155; _A. alpinus_, 31, 101, 156; _A. agrestis_, 7, 18, 30, 50, 52, 53, +101+, 155, +156+; _A. bulbosus_--var. of _A. geniculatus_, 8, _9_, 156; _A. fulvus_--var. of _A. geniculatus_, 156; _A. geniculatus_, 7, _9_, 11, 14, 15, 28, 29, 33, 40, 48, 52, 53, +101+, 155, +156+; _A. pratensis_, 7, 11, 13, 14, _18_, 28, 32, 49, 50, 51, +52+, 55, +82+, +101+, _155_, +156+ Alpine Foxtail--_Alopecurus alpinus_ Alpine Meadow-grass--_Poa alpina_ Alpine Poa--_Poa alpina_ Alps, 36, 37 _Ammophila--Psamma_; _A. arundinacea_--_Psamma arenaria_ _Amphicarpum_, 120 Anatomy, 62-71, 95