. The natural history of plants. Botany. Fig. 151. Flower, (f). bundles of tongues, having no other connection with the filaments. The gynseceum/ supported by the central column of the receptacle, generally recurved outwardly at a certain age, is formed of an ovary with three cells (two of which are posterior), surmounted by a style with three branches, the summit, generally bifid, being furnished within or laterally with stigmatic papilloe. In the inner angle of each cell is seen an axile pla- centa, supporting an anatropous descen- dent ovule, with ventral raphe, and superior exterior microp
. The natural history of plants. Botany. Fig. 151. Flower, (f). bundles of tongues, having no other connection with the filaments. The gynseceum/ supported by the central column of the receptacle, generally recurved outwardly at a certain age, is formed of an ovary with three cells (two of which are posterior), surmounted by a style with three branches, the summit, generally bifid, being furnished within or laterally with stigmatic papilloe. In the inner angle of each cell is seen an axile pla- centa, supporting an anatropous descen- dent ovule, with ventral raphe, and superior exterior micropyle,^ the exostome thickening more or less, and being capped by an obtura- tor, a mass of variable form springing from the placenta like a second ovule superposed to the first. Under the ovary is pretty frequently produced a hypogynous disk, entire or more or less distinctly 3-6 lobed. The fruit is a three- shelled capsule, whose pericarp, of variable thickness,,sometimes more or less fleshy at first in the interior layers, finally becomes dry and opens elastically, at the same time separating from the central columella, on the dilated sum- mit of which the seeds are inserted. The dehiscence is generally septicidal then loculi- cidal; and the seeds, furnished* outwardly with a fleshy arillate tunic through their whole length, or oftener only in the neigh- bourhood of the micropyle,^ contain under their coats * an abundant albumen, fleshy and oily, surrounding an embryo with superior radicle and linear cotyledons more or less oval. The genus Euphorbia, which belongs to all parts X)f the globe, and which, according to the most recent calculations, contains about seven hundred species,^ woody or herbaceous, sometimes fleshy and Etiphorbia Fig. 152. Flower (j). 1 It sometimes aborts. 2 With double eoat. 3 It comes from a thickening of the super- ficial coat situated more or less near to the micropyle. •• As in most of the EuphoriiaefcB, three are di^^tinguished : the
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1871
