. La storia naturale delle piante. La botanica. VMBELLIFERJE. 165 così definito il genere Vanax comprende piante legnose da tutti i paesi caldi del^ del vecchio mondo, con foglie quasi sempre com- Libbra-pinnate, meno frequentemente digitate e talvolta anche semplici o unifoliolate", i fiori sono spesso polygamo-dioica. Cussonia ha un fiore costruito quasi come quello di Panax con dimerous gynsecium. Il calice è breve, intero o ondeggiano al margine e cinque sepali sono valvate. L'ovaio bilocular (alcuni- volte ridotto ad una sola cella) è interamente o solo parzialmente Pmax (yothopanax) mUrea. imbedde

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. The natural history of plants. Botany. VMBELLIFERJE. 165 Thus defined the genus Vanax comprises woody plants from all warm countries of the^ old world, with leaves almost always com- pound-pinnate, less frequently digitate and sometimes even simple or unifoliolate, ' The flowers are often polygamo-dioecious. Cussonia has a flower constructed nearly like that of Panax with dimerous gynsecium. The calyx is short, entire or undulate at the margin and the five sepals are valvate. The bilocular ovary (some- times reduced to a single cell) is entirely or only partly Pmax (yothopanax) mUrea. imbedded in the cavity of the receptacle and surmounted by two recurved stylary horns. The fruit is drupaceous and the seeds have a ruminate albumen. In general the in- ^. „„„ ^. „ „. „„, ^ . ° . Fig, 206. Tricarpellar Fig. 207. Long. sect. florescence is quite peculiar, flower®. of flower. spikehke and dense. Some- times, however, the flowers are in umbellules borne by the divisions of a compound cluster. They are trees and bushes from the Cape, tropical western Africa, Madagascar, Abyssinia and Comoro isles, unarmed or prickly, whose leaves, often collected at the upper part of the stem, are digitate, palmate or bi-digitate, with lobes often deeply incised. The Ivies (fig. 208-212) have also nearly the flower of Panax, especially those which have as many ovarian cells as petals, and almost always the ruminate albumen of Cussonia. In the common Ivy, the floral receptacle is obconical and bears on its margin five small indistinct dentiform sepals ; five triangular and valvate petals, divided internally by a middle ridge into two cavities which receive each a half-anther in the bud; five alternate stamens, the filaments . of which are inserted in an opening in the margin of the epigynous flat-conical'disk which surrounds the style, and whose anthers are bilocular, introrse, oscillant. The style is conical, divided at the summit by five small furrows into five indistinct

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• booksubjectbotany
• bookyear1871