. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 852 THE DISPERSION OF SPECIES BY MEANS OF FEUITS AND SEEDS. according to the particular plant considered, are in the form of scales and leaflets which become detached separately. Instances of this kind are afforded by Artedia sqvMmata, Megacarpcea laoiniata, Mimosa hispidula, JEschynomene glabrata, and Lunaria rediviva (see figs. 4671- ^'", and p. 445, fig. 339 S and fig. 466 ^). With these forms may be classed also such fruits and seeds as are furnished with wing-shaped appendages. The wings ar
. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 852 THE DISPERSION OF SPECIES BY MEANS OF FEUITS AND SEEDS. according to the particular plant considered, are in the form of scales and leaflets which become detached separately. Instances of this kind are afforded by Artedia sqvMmata, Megacarpcea laoiniata, Mimosa hispidula, JEschynomene glabrata, and Lunaria rediviva (see figs. 4671- ^'", and p. 445, fig. 339 S and fig. 466 ^). With these forms may be classed also such fruits and seeds as are furnished with wing-shaped appendages. The wings are either produced from the seed-coat, as in Pines and Firs (see p. 441, fig. 335 % or else arise from the carpels. A single wing, which stands out to one side, is developed in the case of the pods of some tropical Leguminosae ( Secwrida virgata and Gentrolobium robustum; see p. 445, fig. 339 ^), and in the separate parts of the double fruit of the Maple and of the. Fig. 466.—Dispersion of fruits and seeds by the wind, 1 SilicLUOse fruit of Liinaria rediviva; tlie two valves of the fruit have become detached; seeds are fastened to the inside of each valve. 2 Opened capsule of a BigTwnia from which winged seeds are being carried off by the wind, s Capsule of Heliosperma gimdrifidum after dehiscence; the seeds are being shaken out by the wind. ^A seed of Seliosperma quadrijidum magnified, 6 Capsule of a Dioscorea after dehiscence, the winged seeds being blown away by the wind. Banisterias, belonging to the Malpighiacese ( Acer Monspessulanum- and Banisteria Sinemariensis; see figs. 467 "^ and 467"). The achenes of Birches and of the Tree of Heaven ( Betula verrucosa and Ailanthus glandulosa; see ^ and 467^^) bear two laterally placed wings in each case. The mericarps of many Umbelliferse ( Opoponax Gretica and Laserpitiwm latifolium; see figs. 467^ and 467^^) have wings projecting from the back; the fruits of some Polygonums ( Polygonum dum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
