. The classification of flowering plants. Plants. 228 FLOWERING PLANTS [CH. by their almost complete abortion. Occasionally, as in Reimaria (a small American genus), there is but one barren glume, generally there are two, sometimes more than two, as in Anthoxanthum (figs. 102, 103, G). Where there are more than two, many authors consider that the third and higher represent barren flowers, a view which is favoured by the occasional presence of a male flower or of a barren, often rudimentary, pale. Thus in the large genus Panicum, many species have three empty glumes, but frequently the third su
. The classification of flowering plants. Plants. 228 FLOWERING PLANTS [CH. by their almost complete abortion. Occasionally, as in Reimaria (a small American genus), there is but one barren glume, generally there are two, sometimes more than two, as in Anthoxanthum (figs. 102, 103, G). Where there are more than two, many authors consider that the third and higher represent barren flowers, a view which is favoured by the occasional presence of a male flower or of a barren, often rudimentary, pale. Thus in the large genus Panicum, many species have three empty glumes, but frequently the third subtends a male flower or barren pale; the lowest glume is generally smaller than the other two, aad in the closely allied Digitaria is reduced to a nerveless projection or may be completely aborted. The empty glumes may closely resemble the flowering, as in Brim, Eragrostis, Festuca, Poa and others, or be very. A. Spikelet of Oryza sativa (Rice). After Nees. B, diagram. C. Spikelet of Coleanthus subtilis. After Nees. D, diagram. E. Flower of Uniola latifolia. The single (anterior) stamen protrudes from the glume. After Gray. F. Spikelet of Anthoxanthum odoratum, without the two lower barren glumes. G, diagram of spikelet. H. Spikelet of Deyeuxia. The flower lifted out from between the barren glumes ; r, continuation of rachilla. b^, b^, b'^, b-^, successive barren glumes ; /, fertile glume; p, pale. All enlarged. Diagrams after Hackel. different in form, as in Avena (Oat), where they are much larger and envelop the rest of the several-flowered spikelet. In Oryza (fig. 103, A) they are less than half the length of the single-flowered spikelet. They are rarely awned. The flowering glumes, which with the pale usually envelop and fall with the fruit, often bear an awn, either a direct prolongation of the apex (terminal awn) (fig. 104), or attached to the back (dorsal awn) (fig. 103, F, H). The awn may be a simple uniform. Please note that these images are extracted from scanned page
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1904
