线叶葶苈查看源代码讨论查看历史
| 线叶葶苈 |
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中文学名:线叶葶苈 拉丁学名:Draba linearifolia L. L. Lou et T. Y. Cheo 界:植物界 门:被子植物门 纲:双子叶植物纲 目:卫矛目 科:十字花科 属:葶苈属 种:线叶葶苈 中国特有:是 引种栽培:非人工引种栽培 |
线叶葶苈(xiàn yè tíng lì，学名 Draba linearifolia L. L. Lou et T. Y. Cheo)，十字花科葶苈属 植物，多年生草本。我国特有物种，分布于海拔3600-4000米的西藏地区。 [1]
线叶葶苈形态特征
多年生草本。根茎分枝多，略延伸，形成垫状草丛，分枝茎下面宿存枯叶，成纤维状鳞片，当年生的叶密生成柱状。
花茎从枝条旁抽出，向上，结实时高7-10厘米，通常有2-3叶，罕见1叶，被单毛，星状毛、分枝毛。叶线状披针形，长6-10毫米，宽1-1.5毫米，全缘，顶端渐尖，中脉粗，被有硬单毛、星状分枝毛及单缘毛，毛较长而硬；茎生叶窄，全缘，被单毛、分枝毛及星状毛、硬而直。
总状花序有花8-12朵，结实时伸长；小花梗有毛；萼片长椭圆形，边缘淡黄色，被单毛、分枝毛；花瓣黄色，干后近于白色，长倒卵形，长3.5-5毫米。
短角果线状披针形，长7-10毫米，宽1-1.3毫米，常略弯曲，无毛，或边缘略有毛；花柱细，长0.5-1毫米；[2]
果梗与角果等长，与花序轴成近于直角开展。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.
线叶葶苈生长环境
生长在海拔3600-4000米的阴坡。