INDEX 



403 



Half-parasites, 336. 



Halophytes, 311, *319, 320, *326. 



Hard bast, *87, *91, *92. 



Haustoria, 39. 



Head, *188. 



Heart-shaped, *132. 



Heartwood, 105. 



Heliotropism, 148. 



Hemlock, lateral extension of 

 roots, *60. 



Hepaticse, 232, 280, 281. 



Hepaticse, study of, 278-280*. 



Herbs, 70. 



Hesperidium, *225. 



High mallow, provisions for cross- 

 pollination of, *364. 



Hilum, 6. 



Honey-bee, leg of, *356. 



Honey-gland, *357. 



Honey locust, spine, *69. 



Hop, twining of, *75. 



Hormogonia, *238. 



Horse-chestnut bud, study of, 119, 

 120. 



Horse-chestnut, germination, 8. 



Horse-chestnut twig, 62-64. 



Host, 39. 



Hot springs, plants in, 393. 



Hyacinth, bulb of, *79. 



Hybrid, 229. 



Hybridization, 229. 



Hydrangea, transpiration in, 159- 

 161* 



Hydrogen, 168. 



Hydrophytes, 311, *312, *313, 

 *314. 



Hymenium, *265. 



Hyphae, 257, *258. 



Hypocotyl, 6, 25-27. 



Hypocotyl, cross-section of, 95. 



Hypogynous, 204, *205. 



Iceland moss, 274. 

 Imperfect flowers, 199. 

 Indefinite annual growth, 69. 

 Indehiscent fruits, 221, *222. 

 Indeterminate inflorescence, 186. 

 Indian corn, germination of, 8. 

 Indian corn, kernel of, 16. 

 Indian corn, root-tip, *42, ^3. 

 Indian corn, structure of stem, 



*83, 84. 



Indian pipe, 169. 

 India-rubber plant, leaf of, *154. 

 India-rubber plant, transpiration 



of, 160-162. 

 Indusium, 287, *288. 

 Inflorescence, 186-191*. 

 Inflorescence, determinate, 191. 

 Inflorescence, diagrams of, *190. 

 Inflorescence, indeterminate, 186. 

 Insectivorous plants, 340-344*. 

 Insect pollination, 355-369* 

 Insect pollination, study of, 367- 



369. 

 Insects, pollen-carrying apparatus 



of, 355, *356. 



Insects, sense of smell of, 357. 

 Insects, vision of, 358. 

 Insect-traps, leaves as, *342, *343. 

 Insect visits, 358-362*, *365. 

 Insertion of floral organs, *205. 

 Intercellular spaces, *95. 

 Internode, 32, 83. 

 Involucre, 188, *189. 

 Ipomcea Jalapa, 46. 

 Ipomcea, rate of increase of, 390, 



391. 



Iris, rootstock of, *77. 

 Irish moss, 253. 

 Irritability in plants, nature and 



occurrence of, 182-184. 

 Ivy, aerial roots of, *39. 



