Calyx and pistil of Fraxinella Dictamnus Fraxinella. The pistil consists of several carpels, which 97756 flowers delivery sunday elevated on a stalk or gynophore prolonged from the receptacle. by the carpels, so that the outer members of the flower spring 97756 flowers delivery sunday the edge of the receptacle which is immediately above the ovary epigynous, hence the term epigyny fig.

When a flower consists of parts arranged in whorls it is said to be cyclic, and if all the whorls have an equal number of parts and are alternate it is eucyclic figs. In Symmetry contrast to the 97756 flowers delivery sunday flowers are those, as in Magnoli of the flower. aceae, where the parts are in spirals acyclic.

Flowers which are cyclic at one portion and spiral at another, as in many Ranunculaceae, are termed spiral flowers the distinction into series is by no means easy, and usually there is a gradual passage from sepaloid through petaloid to staminal parts, as in the water-lily family, Nymphaeaceae figs. 3 97756 flowers delivery sunday, 32, although in some plants there is no such distinction, the FIG.

article 32, successive stages, a-f, in the transition from petals to stamens. Normally, the parts of successive whorls alternate; but in some cases we find the parts of one whorl opposite or superposed to those of the next some cases, as in the vine-family Ampelidaceae, this seems to be the ordinary mode of development, but the superposition of the stamens on the sepals in many plants, as in the pink family, Caryophyllaceae, is due to the suppression or abortion of the whorl of petals, and this idea is borne out by the development, in some plants of the order, of the suppressed a rule, whenever we find the parts of one whorl superposed on those of another we may suspect some abnormality.

A flower is said to be symmetrical when each of its whorls consists of an equal number of parts, or when the parts of any one whorl are multiples of that preceding it. Thus, a symmetrical flower may have five sepals, five petals, five stamens and five carpels, or the number of any of these parts may be ten, twenty or some multiple of five.

23 is a diagram of a symmetrical flower, with five parts in each whorl, alternating with each other. 33 is a diagram of a symmetrical flower of stone-crop, with five sepals, five alternating petals, ten stamens and five the number of parts in the staminal whorl is double that in the others, and in such a case the additional five parts form a second row alternating with the the staminal whorl especially it is common to find additional rows.

34 shows a symmetrical flower, with five parts in the three outer rows, and ten divisions in the this case it is the gynoecium which has an additional number of parts. 35 shows a flower of heath, 97756 flowers delivery sunday four divisions of the calyx and corolla, eight stamens in two rows, and four divisions of the fig. article 36 there are three parts in each whorl; and in fig. 37 there are three divisions of the calyx, corolla and pistil, and six stamens in two all these cases the flower is Monocotyledons it is usual for the staminal 97756 flowers delivery sunday to be double, it rarely having more than two rows, whilst amongst dicotyledons there are often very numerous rows of floral envelopes are rarely in which the number of parts in each whorl is the same, are isomerous of equal number; when the number in some of the whorls is different, the flower is anisomerous of unequal number.

The pistillate whorl is very liable to frequently happens that when it is fully formed, the number of its parts is local flowers delivery in conformity with that of the other such circumstances, however, a flower has been called symmetrical, provided the parts of the other whorls are normal, - the permanent state of the pistil not being taken into account in determining fig.

38 shows a pentamerous symmetrical flower, with dimerous pistil. Symmetry, then, in botanical language, has reference to a certain definite numerical relation of parts. A 97756 flowers delivery sunday in which the parts are arranged in twos is called dimerous; when the parts of the whorls are three, four or five, the flower is trimerous, tetramerous or pentamerous, symmetry which is most commonly met with is trimerous and pentamerous - the former occurring generally among monocotyledons, 97756 flowers delivery sunday latter among and tetramerous symmetry occur also among dicotyledons.

article The various parts of the flower have a certain definite relation to the axis. 35, one sepal is next the axis, and is called superior or posterior; another is next the bract, and is inferior or 97756 flowers delivery sunday, and the other two are lateral; and certain terms are used to indicate that position. A plane passing through the anterior and posterior sepal and through the floral axis is termed the median plane of the flower; a plane cutting it at right angles, and passing through the lateral sepals, is the lateral plane; whilst the planes which bisect 97756 flowers delivery sunday ?.

11 4lll!0 FIG. - Diagrammatic section of a symmetrical pentamerous flower of Stone-crop Sedum, consisting of five sepals s, five petals 97756 flowers delivery sunday alternating with the sepals, ten stamens a in two rows, and five carpels c containing dark lines d on the outside of the carpels are glands.

- Diagram of the flower of Flax Linum, consisting of five sepals s, five petals p, five stamens a, and five carpels c, each of which is partially divided into dots represent a whorl of stamens which has is pentamerous, complete, symmetrical and regular. article - Diagram of the symmetrical trimerous flower of Fritillary Fritillaria.