無苞雙脊薺檢視原始碼討論檢視歷史
| 無苞雙脊薺 |
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中文學名:無苞雙脊薺 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:雙脊薺屬 分布區域:青海省, 新疆自治區, |
無苞雙脊薺(wú bāo shuāng jǐ jì，學名 Dilophia ebracteata Maxim.，異名：Dilophia hopkinsonii )，雙脊薺屬，為二年生草本植物。產青海、新疆、西藏。生在河灘沙地，海拔2800-3500米。 [1]
無苞雙脊薺形態特徵
二年生草本，高1-4厘米，全部綠色或紅色，除萼片外無毛；根紡錘形，粗且長，上部有 去年莖葉殘餘。
莖多數叢生或單一，肉質，圓柱形。基生葉線形，在開花時枯萎；莖生葉常聚生在莖頂端，線狀匙形，連葉柄長5-20毫米，全緣或每側有1-3個疏齒。
總狀花序密生，無苞片；花梗長約1毫米；萼片寬卵形，長2-3毫米，頂端圓形，外面有少數柔毛；花瓣白色，倒卵形，長3-3.5毫米。
短角果近圓形，長約2毫米，果瓣具1脈，有數個雞冠狀突出物。花期8月，果期9月。[2]
Dilophia ebracteata Maxim. Fl. Tangut. 72. t. 28. f. 34-45. 1889. ——D. hopkinsonii O. E. Schulz in Notizbl. Bot. Gart. Berlin 12: 211. 1934. syn. nov.
Dilophia hopkinsonii O. E. Schulz.
Herbs glabrous throughout, rarely sepals puberulent. Stems erect, somewhat fleshy, simple from taproot, 1.5-10 cm tall. Leaves oblong-spatulate, linear-spatulate, or linear, (3-)5-10(-15) × (1-)1.5-3 mm, fleshy, base attenuate, margin entire, apex obtuse or rounded. Corymbs few to many flowered, only lowermost few flowers bracteate. Fruiting pedicels 3-10 mm. Sepals erect, broadly ovate, 2.5-3 × 1.5-2 mm, glabrous or subapically puberulent, margin broadly membranous, apex entire or minutely denticulate. Petals white, often with pink tinge outside, broadly obovate, 4.5-6 × 2-3 mm, apex rounded or subemarginate; claw to 3 mm. Filaments white, 2-3 mm; anthers ovate, 0.6-1 mm, the apicula ovate, 0.2-0.5 mm, apex rounded. Ovules 2-4 per ovary. Fruit valves oblong, glabrous, 2-2.5 mm, notch to 2 mm wide, apical cristae 4-12; replum 2-2.5 mm wide at base; style 0.2-0.3 mm. Seeds brown, broadly oblong or ovate, somewhat flattened, 1.8-2.2 × 0.9-1.2 mm. Fl. late Jun-Sep, fr. Aug-Oct.
Consolidated turf within scree slopes in alpine meadows and on rocky slopes, Kobresia mats; 4500-5000 m. Qinghai, Xizang.
The records in FRPS and Fl. Xinjiang. (2(2): 91. 1995) of Dilophia ebracteata from Xinjiang are based on misidentified plants of D. salsa. The differences previously used to distinguish D. ebracteata (leaves entire, flowers ebracteate, ovary cristae longitudinal) from D. salsa (leaves dentate or pinnately lobed, flowers bracteate, ovary cristae transverse) do not hold, though the leaves in the latter species are more often sinuate, dentate, or repand, rather than entire.
無苞雙脊薺生長環境
生長於海拔2800-3500米的河灘沙地。