276 GLOSSARY AND INDEX. 



generic, pertaining to a genus, as distinguished from specific, which re- 

 lates to species, 67, 155. 



genus, 155. 



geotropism, the tendency to grow in a certain direction in response to 

 gravitation ; as exhibited in growth towards the center of the earth 

 it Is positive, away from the center of the earth negative geotropism. 

 The latter is also called apogeotropism, 22. 



germination, 20. 



attendant phenomena, 27. 



changes in reserve materials, 26. 



conditions, 26. 



glabrous, smooth, destitute of hairs, 58. 



glaucous, covered with a whitish or bluish-white bloom, 58. 



globoid, an amorphous or rounded mineral body of common occurrence 

 in aleurone grains, 8. 



glume, one of the chaff-like bracts subtending the splkelet of grasses. 

 The lower braotlet subtending an individual flower Is called a floral' 

 glume, 159. 



guard-cell, one of the (usually two kidney- shaped) cells by which a stoma 

 Is opened and closed, 59, 69. 



gymnosperms, the class of so-called naked-seeded plants, including the 

 . Conlferse and their allies, 152. 



gynoecium (also written gynaecium), the pistil or pistils of a flower col- 

 lectively, 79. 



habitat, natural range, 184. 



head, a compact indeterminate inflorescence of sessile flowers, such as 

 that of clover, the Compositae, etc., 256. 



heliotropism, the response of growing organs to the action of light, man- 

 ifested in curvature toward or away from the source of light, the 

 former being positive, the latter negative heliotropism, 22. 



herbaceous, having the character of an herb, 52. 



heteromorphism, 86. 



hilum, the scar marking the place of separation of the ripe seed from its 

 stalk or from the placenta, 1. 



hirsute, covered with coarse and rather stiff hairs, 58. 



homology, morphological identity or likeness, as that of carpel and leaf. 



host, a plant or animal on which a parasite lives, 36, 113, 117. 



hypha (pi. hyphce], one of the fine filaments of which the mycelium and 

 sporophore of a fungus is composed, 109, 112, 116. 



hypocotyl, the part of the stem of an embryo or seedling below the coty- 

 ledons ; the caulicle, 20. 



