. The natural history of plants. Botany. or peltate at the base, which is more or less prolonged below the point of insertion. The petals are inflexed and adnate at the summit, forming a salient ridge which divides into two lobes. They are shrubby or herbaceous plants, often covered with stellate hairs, with simple, dentate, lobed or ternisect leaves. The flowers are in irre- gularly compound umbels, with bracts sometimes wide and petaloid, more rarely reduced to a few or even a single flower. In Siebera, the sepals are nil or narrow, subulate; the petals, concave, imbricate, equal or nearly s
. The natural history of plants. Botany. or peltate at the base, which is more or less prolonged below the point of insertion. The petals are inflexed and adnate at the summit, forming a salient ridge which divides into two lobes. They are shrubby or herbaceous plants, often covered with stellate hairs, with simple, dentate, lobed or ternisect leaves. The flowers are in irre- gularly compound umbels, with bracts sometimes wide and petaloid, more rarely reduced to a few or even a single flower. In Siebera, the sepals are nil or narrow, subulate; the petals, concave, imbricate, equal or nearly so ; the fruit, more or less constricted at the commis- sure, has obtuse but generally distinct primary ridges but no or very fine secondary, covered more or less externally with rugosities; the ^yles are often elongate and curved; the carpophore is simple. They are ericoid shrubs or perennial herbs, with alternate entire rarely squamiform leaves ; the lower sometimes dissected. The flowers are m simple or more generally compound umbels with an involucre of small bracts. Azorella (fig. 166) is with us the type of a third group in which the mericarps of the fruit are very constricted at the commissure, and are attached to each other only by a central linear edge corresponding to an undivided Azoreiia trifoUata. carpophore. The form of the mericarps varies in the true Azorellas. In some they are as wide as thick, in others laterally com- pressed, in others dorsally. They bear each five primary ridges, nearly equal, but slightly prominent or even scarcely visible. One is middle dorsal, the others vary in position according to the form of the mericarps; thus when the latter are dorsally compressed, the margin being more or less thick and ^^s- ^^^- ^"^ (t)- smooth, there is one ridge without and one within this margin. The latter may be carried back more or less on the face as in Spananthe, an American species with alternate or opposite leaves, which we make only a section of Az
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1871
