The elements of botany for beginners and for schools . might escape notice, and even sometimes (asin the Mustard Eamily) disappears altogether. The lowest blossoms of a Pio. 199. Piece of a flowering-stem of Moneywort (Lysimachia nummnlaria,)witli single flowers successively produced in tlie axils of the leaves, from belowupwards, as the stem grows on. Pig. 200. A receme, with a general peduncle (p), pedicels Ip), bracts (J), andbraicUets (&)• Plainly the bracts here answer to the leaves in Pig. 199. n FLOWERS. [section 8. raceme are of course the oldest, and therefore open first, and the orde
The elements of botany for beginners and for schools . might escape notice, and even sometimes (asin the Mustard Eamily) disappears altogether. The lowest blossoms of a Pio. 199. Piece of a flowering-stem of Moneywort (Lysimachia nummnlaria,)witli single flowers successively produced in tlie axils of the leaves, from belowupwards, as the stem grows on. Pig. 200. A receme, with a general peduncle (p), pedicels Ip), bracts (J), andbraicUets (&)• Plainly the bracts here answer to the leaves in Pig. 199. n FLOWERS. [section 8. raceme are of course the oldest, and therefore open first, and the order ofblossomhig is ascending from the bottom to the top. The summit, neverbeing stopped by a terminal flower, may go on to grow, and often doesso (as in the common Shepherds Purse), producing lateral flowers oneafter another for many weeks. 206. A Coiymb (Fig. 202) is the same as a raceme, except that it isflat and broad, either convex, or lavel-topped. That is, a raceme becomesa corymb by lengthening the lower pedicels while the uppermost remam. shorter. The axis of a corymb is short in proportion to the lower pedicels. By extreme shortening of the axis tiie corymb may be converted into207. An Umbel (Fig. 203) as in the Milkweed, a sort of flower-cluster where the pedicels all spring apparently from the same point, from the top of the peduncle, so as to resemble, when spreading, the rays of an umbrella;whence the name. Here the pedicels are sometimes called (heiJays of the umbel. And the bracfs, when brought in this wayinto a cluster or circle, form what is called an Involtjobe. 208. The corymb and the umbel being more or less level-topped, bringing the flowers into a horizontal plane or a con-vex form, the ascending order of development appears as Cfe»-tripetal.,^ That is, the flowering proceeds from the margin orcircumference regularly towards the centre; the lower flowersof the former answering to the outer ones of the latter. 209. In these three kinds of flower-clusters,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
