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The smallerīracts or bracteoles, which occur among the subdivisions of aīranching inflorescence, often produce no flower-buds, and thusĪnomalies occur in the floral arrangements. Terminates the inflorescence of Salvia Horminum. Sometimes they are empty, no flower-budsīeing produced in their axil. Giving rise to the ebracteate inflorescence of Cruciferae and someīoraginaceae. Mere scales or threads, and at other times are undeveloped, May be mistaken for parts of the corolla. When bracts become coloured, as in Amherstia nobilis,Įuphorbia splendens, Erica elegans and Salvia splendens, they Which the young flowers are concealed in their earliest stage of Many cases bracts act as protective organs, within or beneath In some Rosaceous plants an epicalyx is present,ĭue to the formation of stipulary structures by the sepals. It, as in the order Malvaceae and species of Dianthus and winterĪconite ( Eranthis), where they have received the name of epicalyx When the flower is sessile the bracts are oftenĪpplied closely to the calyx, and may thus be confounded with In the lower branches of an inflorescence. The ordinary leaves, as in Veronica Bracts. This phenomenon is known as proliferation Aįlower-bud has not in ordinary circumstances any power of Would produce a leaf-bud, gives origin to a flower-bud. Other causes, that the part of the axis which, in ordinary cases, Of their parts and it sometimes happens, from injury and To each other as regards the arrangement and the development These two kinds of buds have a resemblance Petals multiplied at the expense of the stamens, which are reduced in number.Ĭoloured leaves representing abortive carpels.Īxis prolonged, bearing an imperfect flower at its apex.įlowers are produced from flower-buds, just as leaf-shootsĪrise from leaf-buds.
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It is to this more definite structure that we generally refer But there is considerableĭifference of opinion as to the relation between these conesĪnd the more definite and elaborate structure known as theįlower in the higher group of seed-plants-the Angiosperms ( q.v.)-and In Gymnosperms ( q.v.), which represent the more primitive type of seed-plants, the micro- or macro-sporophylls are generallyĪssociated, often in large numbers, in separate cones, to which These are with few exceptions foliar structures, known in comparative morphology as sporophylls, because they bear the spores, namely, the microspores or pollen-grains which are developed in the microsporangia or pollen-sacs, and the megaspore, which is contained in the ovule or megasporangium. the pollen-bearer or stamen and the ovule-bearer or carpel. As the seed develops from the ovule which has been fertilized by the pollen, the essential structures for seed-production are two, viz. In modern botanical works the group is often known as the seed-plants (Spermatophyta). It is impossible to give a rigid botanical definition of the term “flower.” The flower is a characteristic feature of the highest group of the plant kingdom-the flowering plants (Phanerogams)-and is the name given to the association of organs, more or less leaf-like in form, which are concerned with the production of the fruit or seed. Here we shall deal only with its botanical interest. fleur), a term popularly used for the bloom or blossom of a plant, and so by analogy for the fairest, choicest or finest part or aspect of anything, and in various technical senses. Verticillaster: a false whorl of opposed cymes. FLOWER (Lat. Umbel: a racemose inflorescence in which all the individual flower stalks arise in a cluster at the top of the peduncle and are of about equal length. Thyrse: a branched inflorescence in which the main axis is indeterminate and the lateral branches determinate in their growth. Syconium: a multiple fruit with a hollow centre, e.g. Spike: an unbranched, indeterminate inflorescence in which the flowers are without stalks. Spadix: a spicate inflorescence with a stout, often succulent axis.
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CYME FLOWER ARRANGEMENT SERIES
Raceme: an indeterminate inflorescence in which a main axis produces a series of flowers on lateral stalks, the oldest at the base and the youngest at the top. Inflorescence: the group or arrangement in which flowers are borne on a plant. capitate.Ĭatkin: a spike in which the flowers are unisexual and without conspicuous perianth.Ĭorymb: a racemose inflorescence in which the pedicels of the lower flowers are longer than those of the flowers above, bringing all flowers to about the same level.Ĭyme: an inflorescence in which each flower, in turn, is formed at the tip of a growing axis and further flowers are formed on branches arising below it. Flora of Australia Glossary - Vascular PlantsĬapitulum (= head): a dense cluster of sessile flowers.