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algae antheridia anthers archegonium asexual bacteria bean become branches buds bundles called calyx capsule carbon dioxide carpel cell wall CHAPTER chlorophyll color conidia corn corolla cotyledons cross cultivated developed elongates embryo sac endosperm epidermis example female fern plants filamentous fleshy flowers forest fruit bodies fungi fungus gamete gametophyte germinate green growing grown growth Gymnosperms humus insects large number layer leaf scars leaves lichen liverworts lobes membrane mosses mycelium nitrogen nucellus nucleus outer ovary ovule oxygen paragraph parasitic peas petals pine pistil pollen grain pollen tube portion produce prothallium protonema protoplasm regions root hairs rust scales seed coats seedlings sexual organs shoot showing slender smut soil sometimes species sperm sporangium spores sporophyte stage stalk stamens starch stem sterile stigma structure substance sugar surface takes place thallus thick thin threads tion tissue trees tube usually variety vegetation wheat yeast zygospore
Page 398 - Department of Seed and Plant Introduction of the United States Department of Agriculture, which is already producing very important results for agriculture and horticulture in this country, especially in the Fig.
Page 355 - Conifera* including some shrubs) or cone-bearing trees, the fruit being called a cone because of its form. This family of the class is the only one represented in our area. PINE FAMILY. PINACEAE. Pines. Conifers. Pinaceae. Coniferae. The trees belonging to this family are commonly known as Evergreens, because with the exception of the Larch and the Bald Cypress they do not shed their leaves during the winter.
Page 496 - OF 25 CENTS WILL BE ASSESSED FOR FAILURE TO RETURN THIS BOOK ON THE DATE DUE. THE PENALTY WILL INCREASE TO SO CENTS ON THE FOUR! DAY AND TO $1.OO ON THE SEVENTH DAY OVERDUE.
Page 169 - In the case of a number of varieties of strawberries, it is necessary to plant a "fertilizing" variety among them in order to insure fertilization, since some varieties are sterile to their own pollen. 296. Self-pollination and cross-pollination. — Self-pollination occurs when the stigma is pollinated with pollen from anthers of the same flower. Cross-pollination occurs when the pollen is transferred from the anthers of one flower to the stigmas of another flower either near or remote. Cross-pollination...
Page 76 - LEAVES. 130. The arrangement of leaves on the stem seems to follow certain definite laws, and, barring accidents, is always the same for a given species. 131. Opposite leaves. — Leaves are opposite on the stem when two arise at the same level, or node, but on opposite sides. The milkweed (Asclepias) is a good example, but there are many others, as the horse chestnut, lilac, etc. In these examples each pair is at right angles to the pair above and below, so that looking down the axis of the stem...