INDEX 
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 
roots, *60. 
Hepatice, 232, 280, 281. 
Hepatice, study of, 278-280*. 
Herbs, 70. 
Hesperidium, *225. 
High mallow, provisions for cross- 
pollination of, *364, 
Hilun, 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, 
*314. 
Hymenium, *265. 
Hyphe, 257, *258. 
Hypocotyl, 6, 25-27. 
Hypocotyl, cross-section of, 95. 
Hypogynous, 204, *205. 
extension of 
311, ¥*812, ¥*313, 
403 
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, 43. 
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. 
Ipomeea Jalapa, 46. 
Ipomeea, rate of increase of, 390, 
391. 
Iris, rootstock of, *77. 
Irish moss, 258. 
Irritability in plants, nature and 
occurrence of, 182-184. 
Ivy, aerial roots of, *39. 
