線葉葶藶
| 線葉葶藶 |
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中文學名:線葉葶藶 拉丁學名:Draba linearifolia L. L. Lou et T. Y. Cheo 界:植物界 門:被子植物門 綱:雙子葉植物綱 目:衛矛目 科:十字花科 屬:葶藶屬 種:線葉葶藶 中國特有:是 引種栽培:非人工引種栽培 |
線葉葶藶(xiàn yè tíng lì，學名 Draba linearifolia L. L. Lou et T. Y. Cheo)，十字花科葶藶屬 植物，多年生草本。我國特有物種，分布於海拔3600-4000米的西藏地區。 [1]
目錄
線葉葶藶形態特徵
多年生草本。根莖分枝多，略延伸，形成墊狀草叢，分枝莖下面宿存枯葉，成纖維狀鱗片，當年生的葉密生成柱狀。
花莖從枝條旁抽出，向上，結實時高7-10厘米，通常有2-3葉，罕見1葉，被單毛，星狀毛、分枝毛。葉線狀披針形，長6-10毫米，寬1-1.5毫米，全緣，頂端漸尖，中脈粗，被有硬單毛、星狀分枝毛及單緣毛，毛較長而硬；莖生葉窄，全緣，被單毛、分枝毛及星狀毛、硬而直。
總狀花序有花8-12朵，結實時伸長；小花梗有毛；萼片長橢圓形，邊緣淡黃色，被單毛、分枝毛；花瓣黃色，干後近於白色，長倒卵形，長3.5-5毫米。
短角果線狀披針形，長7-10毫米，寬1-1.3毫米，常略彎曲，無毛，或邊緣略有毛；花柱細，長0.5-1毫米；[2]
果梗與角果等長，與花序軸成近於直角開展。花果期6-7月。
Draba linearifolia L. L. Lou et T. Y. Cheo, 西藏植物志2: 346. 1985.
Herbs perennial, to 10 cm tall, densely cespitose, scapose. Caudex many branched, ultimate branches terminated in columnar rosettes and covered with spiny leaf midveins of previous years. Stems erect, slender, simple, pubescent with subsessile, forked and stellate trichomes. Basal leaves densely rosulate, persistent, sessile; leaf blade linear, 5-10 × 0.5-0.8 mm, abaxially subhirsute with subsessile, forked and 3-5-rayed stellate trichomes, adaxially densely hispid with simple trichomes, ciliate with setose simple trichomes to 1.5 mm, base attenuate, margin entire, apex acute; midvein very prominent abaxially to apex, usually as broad as or broader than blade on each side, 0.2-0.3 mm wide near base. Cauline leaves 1-3, sessile, oblong-linear, with indumentum similar to that basal leaves, margin entire, apex acute. Racemes 8-12-flowered, ebracteate, elongated in fruit. Fruiting pedicels 4-5 mm, divaricate-ascending, straight, pubescent all around with forked and stellate trichomes. Sepals oblong, ca. 1.5 × 0.9 mm, erect, abaxially pubescent, base of lateral pair not saccate, margin narrowly membranous. Petals yellow, drying white, narrowly obovate, 3-4.5 × 1-1.5 mm, apex obtuse. Filaments ca. 1.5 mm; anthers ovate, ca. 0.2 mm. Fruit linear-lanceolate, 7-10 × 1-1.3 mm, not twisted; valves glabrous, obscurely veined, base and apex subacute; style 0.5-1 mm. Mature seeds not seen. Fl. and fr. Jun-Jul.
線葉葶藶生長環境
生長在海拔3600-4000米的陰坡。