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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Streptanthus breweri ： ウィキペディア英語版 Streptanthus breweri ''Streptanthus breweri'' is a species of flowering plant in the mustard family known by the common name Brewer's jewelflower. It is endemic to California, where it can be found in the coastal mountain ranges from the Klamath Mountains south to the San Francisco Bay Area. Its habitat includes chaparral and woodlands, usually on serpentine soils. It is an annual herb producing an erect, branching stem up to about 80 centimeters in maximum height. It is hairless except for fine hairs on some of the inflorescence parts, and it may be waxy in texture. The basal leaves have oval blades borne on petioles, and the lance-shaped leaves farther up the stem clasp it at their bases. Flowers occur at intervals along the upper stem, sometimes in a zig-zagging, one-sided array. Each has an urn-shaped calyx of keeled greenish or purplish sepals under a centimeter long. White, purple, or purple-veined white petals emerge from the tip. The fruit is a narrow, curved silique which may be 9 to 11 centimeters in length. The leaves of the plant sometimes have hardened, orange-pigmented callosities on the blades which are thought to be egg-mimics.〔Shapiro, A. M. (1981). (Egg-mimics of Streptanthus (Cruciferae) deter oviposition by Pieris sisymbrii (Lepidoptera: Pieridae). ) ''Oecologica'' 48:1 142-3.〕 Female California White butterflies (''Pontia sisymbrii'' syn. ''Pieris s.'') lay eggs on ''Streptanthus'' leaves, and they choose leaves that have not yet had eggs deposited on them.〔 Each larva can easily eat a whole plant, and the butterfly performs an "egg-load assessment" to determine the potential competition for its larva.〔 Leaves that have grown callosities, which strongly resemble the orange eggs of the butterfly, are less likely visited by egg-laying females, protecting the plant from herbivory.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Streptanthus breweri」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.