. Fondements de la botanique, la fleur ; d'où cette plantsare a dit d'avoir une inflorescence d'une durée déterminée. Le simplestpossible ce genre de cas est thatin dont la tige porte mais oneflower à son sommet. 204. La Cyme très oftenflowers.-apparaissent de latérale (axil-lary) bourgeons, ci-dessous le terminalflower, et ainsi donner lieu à aflower-cluster appelé une cyme.Cela peut avoir seulement trois fleurs,et dans ce cas serait verymuch comme un trois-floweredumbel. Mais dans la grappe, corymbe ombelle,et l'ordre est offlowering,vers le haut par en dessous ou par l'extérieur de la clus-ter à l'intérieur, parce que la plus faible ou la face externe

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. Foundations of botany. the flower; hence such plantsare said to have a determinate inflorescence. The simplestpossible case of this kind is thatin which the stem bears but oneflower at its summit. 204. The Cyme.—Very oftenflowers appear from lateral (axil-lary) buds, below the terminalflower, and thus give rise to aflower-cluster called a cyme.This may have only three flowers, and in that case would look verymuch like a three-floweredumbel. But in the raceme, corymb, and umbel the order offlowering is from below upward, or from the outside of the clus-ter inward, because the lowest or the outermost flowersare the oldest, while in determinate forms of mflorescencethe central flower is the oldest, and therefore the order ofblossoming is from the center outwards. Cymes are verycommonly compound, like those of the elder and of manyplants of the pink family, such as the Sweet William andthe mouse-ear chickweed (Fig. 137). They may also, asalready mentioned, be panicled, thus making a clustermuch like Fig. 136, A, . Fig. 137. — Compound Cyme ofMouse-Ear Chickweed. t, the terminal (oldest) flower. CHAPTER XIVTHE STUDY OF TYPICAL FLOWERS (Only one of the three flowers described to be studied by aid of thesedirections.) 205. The Flower of the Trillium. — Cut off the flower-stalk ratherclose to the flower; stand the latter, face down, on the table, anddraw the parts then shown. Label the green leaf-like parts sepals, and the white parts, which alternate with these, petals. Turn theflower face up, and make another sketch, labeling the parts as before, together with the yellow enlarged extremities or anthers of the stalkedorgans called stamens. Note and describe the way in which the petals alternate with thesepals. Observe the arrangement of the edges of the petals towardthe base, — how many with both edges outside the others, how manywith both edges inside, how many with one edge in and one out. Note the veining of both sepals and petals, more distinct inwhich set?^ Pull o

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