. Text-book of botany, morphological and physiological. Botany. FIG. 412.—Diagram of the flower of Capparidese; A Cleome dro- sercefolia, B Polanisiagraveolens (after Eichler). Fig. 413.—Diagram of the flower of Cruciferae. median stamens are only split and the two halves of each provided with half-anthers, while in Crambe each of the four inner stamens puts out a lateral sterile branch, which may be explained as the commencement of a further multiplication of the stamens such as actually occurs in the Grucifer Megacarpcea and in many Cleomeae. Even if the way in which increase of the typical
. Text-book of botany, morphological and physiological. Botany. FIG. 412.—Diagram of the flower of Capparidese; A Cleome dro- sercefolia, B Polanisiagraveolens (after Eichler). Fig. 413.—Diagram of the flower of Cruciferae. median stamens are only split and the two halves of each provided with half-anthers, while in Crambe each of the four inner stamens puts out a lateral sterile branch, which may be explained as the commencement of a further multiplication of the stamens such as actually occurs in the Grucifer Megacarpcea and in many Cleomeae. Even if the way in which increase of the typical dimerous number of the inner whorl of stamens has been brought about be still obscure, it appears certain that the inconstancy of the number of the members of the staminal whorl proves that in Cruciferae and Cle- omeae a deviation has arisen in this part of the flower from the typical dimerous number, while the other whorls have remained unchanged. The only deviation which occurs in the gynaeceum of the Crucifers is in the genera Tetrapoma and Holargidium, where, besides the two lateral carpels, two median ones are also produced, thus forming a four-lobed ovary2. An essentially different kind of increase in the typical number of the members of a floral whorl may be caused by the formation in the still very young bud of new members of the same kind between those already in existence and on the same zone. FIG. 414.—Diagram of the flower of Dictamnus Fraxinella (cf. Fig. 38 ). of the receptacle; i. e* by what we have already described as the Interposition of new members. This I found to occur, for example, in Dictamnus Fraxinella j(Fig. 388), and is represented in the diagram, Fig. 414, by the stamens of later origin being shaded not so dark as those of earlier origin. It may, I think, be inferred from Payer's descriptions 1 [The theory of an original dimerous symmetry in the flowers of Cruciferae has been pushed still further by Meschaeff (Bull. Soc. Imp. Nat. Mosc), who re
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1882
