特徵描述
作者
YING, SHAO-SHUN
型態特徵
Annual or perennial herbs, rarely small subshrubs, inermous, terrestrial or aquatic, usually with watery juice. Leaves radical or cauline, spirally arranged, rarely subopposite, simple to pinnately lobed; stipules absent or reduced to fine bristles or glands. Flowers usually hermaphroditic, hypogynous, in terminal or axillary racemes, sometimes solitary or several-clustered; sepals 4, free, imbricate, decussate in 2 series, rarely valvate; petals 4, free, usually clawed, alternating with the sepals; stamens mostly 6, 4-dynamous in 2 rows (the outer two stamens shortest) or 2-dynamous or 1–5 by reduction, or more than 6 by division (up to 16), filaments usually free, sometimes winged or dentate, anthers mostly sagittate, 1–2-celled, longitudinally dehiscent, nectaries variously arrayed around base of stamens; ovary syncarpous, of 2 carpels, usually bilocularly divided by a false septum (replum), style usually persistent, simple, stigma discoid, sometimes bifid. Fruit a capsule, dehiscing from below by two valves (a silique when more than 3 times as long as wide; a silicle when less than 3 times as long as wide), rarely lomentoid or indehiscent. Seeds 1-numerous, mostly exalate; embryo large; endosperm scanty or absent; cotyledons large, incumbent, accumbent or conduplicate.
屬
Genera up to 300, with more than 2,500 species of world-wide distribution, but mostly in temperate regions. Twelve genera with 22 species, one variety and one form in Taiwan.
參考文獻
Thlaspi 菥蓂屬
作者
Ming-Jer Jung, Gwo-Ing Liao and Chang-Sheng Ku
型態特徵
Herbs, annual, biannual, or perennial. Roots cylindric, not fleshy. Glabrous to glaucous, trichomes absent or simple, branched trichomeswanted. Cauline leaves sessile, auriculate, sagittate, to amplexicaul, but not petiolate. Inflorescence a raceme. Silicle longer than wide or about as long as wide, apex often notched and winged apically, not spiny.
