File:An illustrated guide to the flowering plants of the middle Atlantic and New England states (excepting the grasses and sedges) the descriptive text written in familiar language (1910) (14802687073).jpg

Identifier: illustratedguide00stev (find matches)
Title: An illustrated guide to the flowering plants of the middle Atlantic and New England states (excepting the grasses and sedges) the descriptive text written in familiar language
Year: 1910 (1910s)
Authors: Stevens, George T. (George Thomas), 1832-1921
Subjects: Plants
Publisher: New York, Dodd, Mead and company
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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e superficialacquaintance of plants which one may encounter or collect. Books treating of both internal and external structural botanyand of vegetable physiology are to be found in which the scienceis treated, some from an elementary standpoint, others from a mosttechnical point of view. 4 OUTLINE OF STRUCTURAL BOTANY It is to sncli works that the student slionld resort according totlie degree to which he wovild carry h\s study in order that hisacquaintance with the vegetable world may become an intimate oneof greatest interest. ORGANS OF VEGETATION The organs of vegetation consist of the root, the stem and theleaves, with those modifications of leaves consisting of the organsdestined to reproduce the species, the spore in non-flowering plantsand the flower and fruit of flowering plants. THE ROOT The root is that part of the plant usually growing downward,whose office it is, especially, to absorb from its surrounding medium,most commonly the soil, the moisture and some other materials
Text Appearing After Image:
Fig. I from which the plant derives certain elements of its nourishment.The root also, in a great majority of cases, serves to fix the plantin a position favoral)!e to its existence and growth. It differs fromthe stem in not bearing leaves. Some plants, notably many species of the orchid group in tropicaland semi-tropical climates and some trees, as for example the man-grove, are supplied with aerial roots. Some of these roots growingin the open air cling to the branches of trees, while other aerialroots hang as long, more or less fleshy, pendants or cords exposedto the winds. Otiier aerial roots, arising irregularly in the courseof the stem, as for example, those from the stem of the ivy (Fig. 1),and which have for tboir purpose, in general, the support of weakclimbing stems, arc known as adventitous roots. Such roots grow- OUTLINE OF STRUCTURAL BOTANY ing at regular intervals, as at the leaf axils, are lateral roots(Fig. 3).

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