. The natural history of plants. Botany. Fig. 73. Fruit. Fig. 74. Trans, sect, of fruit (j). Laserpitium (fig. 73, 74) has given its name to a tribe (Laserpitiece) ; we refer it to the preceding types. The fruit is slightly compressed parallel to the commissure, and its primary and secondary ridges are visible. But whilst the primary are linear and little prominent, the secondary are developed Laserpitium latifoiium. into entire or dentelatc wings, flat or nearly so, especially the marginal, which are ordinarily larger than the dorsal. The seed, in this genus, is flat or sMghtly con- cave on t
. The natural history of plants. Botany. Fig. 73. Fruit. Fig. 74. Trans, sect, of fruit (j). Laserpitium (fig. 73, 74) has given its name to a tribe (Laserpitiece) ; we refer it to the preceding types. The fruit is slightly compressed parallel to the commissure, and its primary and secondary ridges are visible. But whilst the primary are linear and little prominent, the secondary are developed Laserpitium latifoiium. into entire or dentelatc wings, flat or nearly so, especially the marginal, which are ordinarily larger than the dorsal. The seed, in this genus, is flat or sMghtly con- cave on the ventral sur- face. There are a score of species of Laserpitium, perennial herbs, glabrolis or hispid, with leaves, involucres and involucels formed of an indefinite number of linear bracts. They inhabit Europe, northern Africa and western Asia. Thapsia (fig. 76, 76) is very near Laserpitium. They are herbaceous and perennial plants. All the ridges of the fruit Thapsia garganica. are linear, except the marginal secondary, which are dilated into large membranous wings. More rarely the dorsal also become aliform but re- main much narrower. In the true Thapsia the ventral face of the seed is flat. In Elceoselinum, it becomes concave, with the margins much involute; so that it is to other Thapsias what Torilis is to Daucus proper. This genus is Mediterranean. Its fruit has vittse only under the secondary ridges. Fig. 75. Fruit (J). PolylopMum, a glabrous perennial herb of Persia and the neighbouring regions, has quite the organization of Laserpitium. But the ovoid fruit, dorsally com- pressed, has all the ridges dilated to short, undulate wings, divided and crumpled at the margin. In Melanoselinum (fig. 77, 78), native of Madeira and Cape Verd, the stem is often erect and woody, and the inflorescence is furnished with involucre and involucels. The primary ridges are little prominent and the two lateral occupy a portion of the internal face of the. Please note that these images ar
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1871
