. La classification des plantes à fleurs. Les plantes. CAPRIFOLIACEAE 563 à côte sur le noeud et, dans certains cas-Viburnum et Leycesteria-ils devenir des organes sécrétant le nectar. La différence entre Sambucus et le reste de la famille déjà noté dans les feuilles est souligné dans l'ana- tomical structure. En général, l'essentiel du bois se compose d'prosenchymatous avec les trachéides aréolées, et les navires sont essentiellement du type scalariformes, tandis que dans le bois de Sambucus-portent de simples fosses et le type de navire scalariformes est rare. L'origine de la principale variable du périderme est même dans la même

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. The classification of flowering plants. Plants. CAPRIFOLIACEAE 563 by side at the node—and in some cases—Viburnum and Leycesteria—they become nectar-secreting organs. The difference between Sambucus and the rest of the family already noted in the leaves is emphasised in the ana- tomical structure. Generally the bulk of the wood consists of prosenchymatous tracheids with bordered pits, and the vessels are mainly of the scalariform type, while in Sambucus the wood-fibres bear simple pits and the scalariform type of vessel is rare. The origin of the primary periderm is variable even in the same genus. The inflorescence shews varying degrees of development. A regular cyme is seen in Leycesteria formosa; in species of Lonicera the central flower is often suppressed (fig. 262, D) forming a two-flowered cyme in which case the ovaries of the pairs of floAvers become more or less united (compare Naucleae in Rubiaceae); in Symphoricarpus and Diervilla the lateral flowers are suppressed and the inflorescence has the appear- ance of a spike or raceme. Large repeatedly branched inflorescences, ending in cymes, occur in Sambucus and Viburnum. The bracteoles are generally developed. The flowers of Sambucus F*6i^mi^m are regular (figs. 260, 261), ^ith. a generally rotate short-tubed corolla—except the zygomorphic sterile flowers on the outside of the inflorescence of species of Viburnum, which recall the similar phenomenon in some Umbelliferae. Those of Lonicera are markedly zygo- morphic wdth generally a long slender tube and a two-lipped limb, four of the five segments uniting to form the upper lip (fig. 262). A tendency to zygomorphy is noticeable in the other genera, thus the bell-shaped corolla of Symphoricarpus and Linnaea (also tubular-funnel-shaped) is regular with a tendency to zygomorphy. The pos- terior stamen is reduced or suppressed 260. Fl^al diagram of in Dipelta (China) smd Liniiaea, and Sambucus Ehulus. (After the stamens are didynamous. Sam- ^^^^^^^-^ b

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