Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . plants with such flowers are said to be polygamous. 485. In some of the blossoms of certain plants both stamens andpistils are wanting. This is the case with those that occupy themargin of the cymes of the Hobblebush and some-other Viburnums,and of Hydrangea (Fig. 420), or even with the whole cluster incultivated monstrous states, as in the Snowball or Guelder-Roseof the gardens (Viburnum Opulus). Here the enlarged coro
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . plants with such flowers are said to be polygamous. 485. In some of the blossoms of certain plants both stamens andpistils are wanting. This is the case with those that occupy themargin of the cymes of the Hobblebush and some-other Viburnums,and of Hydrangea (Fig. 420), or even with the whole cluster incultivated monstrous states, as in the Snowball or Guelder-Roseof the gardens (Viburnum Opulus). Here the enlarged corollas FIG. 419. A staminate flower of Salix purpurea (or monandra), with the stamens coalescent(monadelphous anil syngenesious), so as to appear like a single one. SUPPRESSION OR ABORTION OF PARTS. 263 make the whole blossom. Such flowers, being neither staminatenor pistillate, are said to be neutral. In so-called compound flowers(394) the strap-shaped marginal flowers are sometimes neutral, asin Coreopsis (Fig. 324, 325), Mayweed, and Sunflower. In someGrasses and other plants such neutral flowers want the floral en-velopes also, or are reduced to an abortive 486. The suppression or abortion of a whole circle of organs in asymmetrical flower does not destroy its symmetry, if we take noteof the absent members. Thus a monochlamydeous flower, with asingle full circle of stamens, usually has the latter placed oppositethe leaves of the perianth, that is, of the calyx, the corolla or in-tervening circle having failed to appear. But when, with the abor-tion of the primary circle, say of the stamens, we have an augmenta-tion of one or more additional circles of the same kind of organ, thelaw of alternation appears to be violated; the stamens that arepresent, or the outer circle of them, standing before the petals, in-stead of alternate with them. It is customary to assume this ex-planation for all cases of the anteposition of the stamens to the pet-als, whether in the Primro
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
