. The natural history of plants. Botany. UMSELLIFHR2E. 135. Fig. 149. Face of mericarp. Fig. 150. Back of mericarp. natives of the mountains of the warm western regions of the two Americas. Tfachydium (fig. 149, 150) consists of annual or perennial herbs, of temperate Asia, chiefly the mountains of northern India, whose characters are mostly those of the preceding genera, but the Trachyditm soyui. fruit, oval compressed and hollow on each side of the commissure, is furnished with a bifid or bi- partite carpophore, and sur- mounted by a conical depressed or elongate disk. The ridges are obtuse,
. The natural history of plants. Botany. UMSELLIFHR2E. 135. Fig. 149. Face of mericarp. Fig. 150. Back of mericarp. natives of the mountains of the warm western regions of the two Americas. Tfachydium (fig. 149, 150) consists of annual or perennial herbs, of temperate Asia, chiefly the mountains of northern India, whose characters are mostly those of the preceding genera, but the Trachyditm soyui. fruit, oval compressed and hollow on each side of the commissure, is furnished with a bifid or bi- partite carpophore, and sur- mounted by a conical depressed or elongate disk. The ridges are obtuse, covered with rugose, papillose or irregular vesicular prominences, and the exocarp separates in the form of a floating membrane, from the deep bed of the pericarp. In each furrow are from one to three vitt«, and the seed has a concave face, traversed only by a vertical furrow in Eremodaucus, which forms a section of that genus of which the carpophore is believed to be undivided. Near Goniwn, with a fruit more elongate and similar to that of Carum, Musenium, comprising perennial and csespitose herbs of North America, has no involucre, umbels with numerous bracteoles, with a central flower generally more developed than those at the sides, a separating carpophore, numerous vittSB, a channeled seed with concave face, white or yellow petals with inflexed point, unequal persistent sepals, the two larger crowning the anterior mericarp. Musenium has decompound pinnate leaves with pinnatifid segments ; the flowers are white or yellow, and the fruit is covered with short rugose hairs. Tauschia also consists of small American perennial plants similar to Musenium. The radical leaves are pinnate or bi- pinnate with oval or dentate segments. The fruit, oval and com- pressed perpendicular to the partition, resembles that of certain Arracacias. It is glabrous, with equally prominent ridges and solitary vittaB in the furrows. The stylopods are depressed and the carpo- phore is undivided. It d
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1871
