270 
Morning-glory, development of, 112, 113. | Pins with dust boxes, see “ stamens.” 
stem of, 114, 115, 117, 123. 
Mountain laurel, buds of, 129. 
arrangement of stamens of, 226, 227. 
Mullein leaves, 170, 175. 
N 
Nasturtium spur, 226. 
Nepenthes leaf, 178, 179. 
Nettles, 175. 
Net-veined leaves, 165, 166. 
Nightshade, enchanter’s, 195. 
Nightshade, garden, II5. 
Nourishment of plant, I50. 
O 
Oak, seed of, 68. 
root of, 145. 
leaf of, 167. 
Oat seed, a food, g1. 
Orchid family, 107, 223, 224. 
Orchids, 123, 223, 224, 226. 
Ovary, see ‘‘ seedbox.” 
Pp 
Palm tree, trunk of, 121. 
Pansy, plan of, 220. 
Parallel-veined leaves, 166. 
Parasitic plants, 108—-III. 
Parsley family, 247. 
Partridge berries, 45, 46, 51. 
Partridge vine, 46, 184, 231. 
Pea, seed of, 80, 87, 90, 242. 
seed leaves of, 87. 
stem of, II5. 
pod of, 241, 242. 
Pea blossom, stamens of, 194, 241, 242. 
pistil of, 200, 241, 242. 
analysis of, 240-242. 
Pea family, 54, 240. 
Peach, compared with apple, 36. 
blossom of, 38. 
Persian origin of, 4o. 
buds of, 129. 
Pear, compared with apple, 31. 
blossom of, 32. 
buds of, 129. 
Pear, wild, 118. 
Peony seeds, 75, 76. 
Perspiration of plants, 148, 149, 160. 
Petals (handkerchiefs) , used as signals, | 
17, 18, 188, 192, 221, 223, 226. 
functions of, 188. 
Pine, cone of, 62. 
classified, 88, 89. 
leaves of, 171, 184. 
flower of, 197. 
| Pins without dust boxes, see “ pistils.” 
| Pistils (pins without dust boxes), de: 
scribed, 15, 18, 197-202. 
function of, 188, 198, 199. 
defined, Igo. 
varieties of, 200. 
flowers with many, 201, 202. 
fruit formed from, 202. 
position of, 227, 228, 248. 
of strawberry, 233, 234. 
of berries, 236. 
Pit or stone, 37. 
Pitcher plant, 176-178. 
Pith, defined, 120, 121. 
Plants, flowering, 22. 
object of life of, 22, 23. 
use of, to world, 26, 27. 
service of, to animals, 26, 27, 156, 
157: 
young, 75-98. 
nourishment of, 75, 76, 77, 150, 156- 
160. 
with two seed leaves (dicotyledons), 
85-87. 
with one seed leaf (monocotyledons), 
88. 
with many seed leaves (polycotyle 
dons), 88, 89. 
parasitic, Io8-I1I. 
development of, 112, 113. 
absorption of water by, 147. 
perspiration of, 148, 149, 160. 
as air purifiers, I5I-153, 158, 159. 
breathing of, 158-160. 
storing of food in, 185, 216, 217. 
protection of, 214, 215. 
Plants and animals, difference be- 
tween, I54, 155. 
Plum, compared with apple, 36. 
blossom of, 38. 
| Plum, wild beach, 4o. 
| Pods, 35, 54, 55; 58, 65-67, 241, 242. 
| Poison i Ivy, 107, II5, 116. 
Pollen (flow er dust), described, 
1g6-199. 
carriers of, 17, 18, 189, 207, 213, 223, 
224, 226-230, 233. 
effect on pistil, 18, 20. 
fertilizing power of, 18, 20, 196-199. 
transportation of, 18, 207, 2II, 213, 
226, 227, 229-231, 233, 250. 
function of, 188, 198, Ig9. 
varieties of, 196, 197. 
defined, I99, 200. 
14, 
Polycotyledonous plants (plants with 
many seed leaves), 88, 89. 
Polygala, 222. 
Poplar tassels, 211. 
Poppy seed, dispersal of, 70, cS 
