. L'histoire naturelle des plantes. La botanique. 10 L'HISTOIRE NATURELLE DES PLANTES. Fiorihunda ia traden cellulaire. et un feuillage variable, parfois celle d'Ghoetostoim parfois, que près d'MicroUcia. Ceux qui sont appelés dans Pyramia l'ovaire a quatre ou cinq cellules, et les cheveux blancs avec laquelle les diverses parties sont couvertes sont la vedette. Lithobium Castratella Eriocnema, et, avec l'organisation de la types précédents, sont des plantes herbacées, tous d'Amérique tropicale. Une com- mun, à l'occasion du sommet de l'arbre porte des fleurs soli- taire ou plus généralement recueillis sous forme- umbelli cymep quelques fleurs. Dans le premier cas, le

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. The natural history of plants. Botany. 10 NATURAL HISTORY OF PLANTS. Cell traden ia fiorihunda. and a variable foliage, sometimes that of Ghoetostoim, sometimes that nearly of MicroUcia. In those called Pyramia the ovary has four or five cells, and the hairs with which the various parts are covered are starred. Lithobium, Castratella, and Eriocnema, with the floral organization of the preceding types, are herbaceous plants, all from tropical America. A com- mon shaft bears at its summit flowers soli- tary or more generally collected in umbelli- form few-flowered cymep. In the former case the flower is trimerous, with six sta- mens, anthers shortly claviform, emarginate, with connective a little prolonged at the base and destitute of appendage. In Castra- tella the tetramerous flower has eight stamens equally claviform, rounded and enlarged at the summit, with two scarcely marked pro- minences near the contracted base. The ovary is half adherent; it is free in Erioc- nema, which has 4, 5-merous flowers with pointed petals and twice as many stamens with narrow elongate anther surmounting an inflexed filament. In their habit the latter genera closely resemble Bertolonia (fig. 14-16), one tribe of which has received the name (Bertoloniece). The receptacle, in the form of a reversed cone, more or less accrescent around the fruitj is often furnished externally with angular prominences or wings (in number 3-9). The calyx is short, formed of five sepals with which alternate as many obtuse contorted petals. There are ten stamens with undulated anthers without appendage; and the ovary, adherent to a variable extent, has three cells surmounted by an equal number of superposed scales, forming an epigynous cupule. The flowers are grouped, at the end of a common shaft, in a scorpioid cyme, often much elongated. From Bertolonia we do not separate generically Salpinga, having 4, 5-merous flowers and a spur-like prominence below and behind the connective ; Macrocentum, whose sepal

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• bookcentury1800
• bookdecade1870
• booksubjectbotany
• bookyear1871