. A Manual of botany : being an introduction to the study of the structure, physiology, and classification of plants . Botany. COEOLLINE APPENDAGES. 209 two flowering glumes. In the Oat (Avena) there are two empty glumes [gluma, a husk), usually three flowering glumes with awns, and two lodicules (hdicula, a coverlet), .representing the perianth. In Sedges (Oarices) the male flowers are borne on scales, and so are the female, as shown in figure 332, in which the scale, s, is placed on one side. Within the scale the female flower is situated, having a peculiar bag-like covering, m, termed perig
. A Manual of botany : being an introduction to the study of the structure, physiology, and classification of plants . Botany. COEOLLINE APPENDAGES. 209 two flowering glumes. In the Oat (Avena) there are two empty glumes [gluma, a husk), usually three flowering glumes with awns, and two lodicules (hdicula, a coverlet), .representing the perianth. In Sedges (Oarices) the male flowers are borne on scales, and so are the female, as shown in figure 332, in which the scale, s, is placed on one side. Within the scale the female flower is situated, having a peculiar bag-like covering, m, termed perigynium. Nectaries and Anomalies in Petals.âCertain abnormal appearances occur in the petals of some flowers, which received in former days the name of nectaries. The term nectary was very vaguely applied by Linnaeus to any part of the flower which presented an un-. Kg. 331. Fig. 332. Fig. 383. Fig. 334. usual aspect, as the crown (corona) of Narcissus, the fringes of the Passion-flower, etc. If the name is retained, it ought properly to include only those parts which secrete a honey-like matter, as the glandular depression at the base of the perianth of the Pritillary- (fig. 333 ?â ), or on the petal of Eanunoulus, or on the stamens of Kutacese. The honey secreted by flowers attracts insects, which, by conveying the pollen to the stigma, effect fertilisation. What have usually, however, Fig. 331. Flower of Oat [Avmia saliva), witli tlie two empty glumes, and the outer flowerâ glume removed. The inner glumella or palea, pi, is seen of a lanceolate form, and bidentate at the apex. The outer glumella has a long twisted geniculate dorsal awn, with two points of bristlei! at the summit. By removing this glumella there are seen two scales (lodicnlse, squamse), sg, with the three stamens and two feathery styles. Fig. 332. Female (pistilli- ferous or pistillate) flower of a Sedge (Carex), with a single glume or scale, s. The pistil is covered by an nroeolate glumaceous bag, u, called
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
