北方庭荠查看源代码讨论查看历史
北方庭荠 |
中文学名:北方庭荠 拉丁学名:Alyssum lenense Adams 界:植物界 科:十字花科 属:庭荠属 种:北方庭荠 分布区域:[[黑龙江]、内蒙古。 |
北方庭荠(学名:Alyssum lenense)为十字花科庭荠属下的一个变种。 [1]
北方庭荠形态特征
北方庭荠,多年生草本,高5-15(-20)厘米,密被星状毛,呈灰绿色;有时茎基部与叶成淡紫色,分枝多,先铺散,后上升,常成丛状生长。
能育枝与不育枝上的叶相似,偶有不育枝上叶变小;叶无柄,叶片长圆状条形或长圆状披针形,长1-1.7(-2)厘米,宽1-2.5毫米,顶端急尖,基部渐窄。
花序伞房状,果期极伸长,花梗长2-4毫米;萼片长圆状椭圆形,长2.4-3.5(-4)毫米,有白色边缘;花瓣黄色,宽倒卵状楔形,长5-6毫米,宽2-3毫米,顶端钝或截形,爪部楔形。
短角果椭圆形,长4-6(-7)毫米,宽3-4毫米,花柱宿存;果瓣顶端微缺,中间凸起,无毛;果梗长5-10毫米,斜向上或水平展开。
每室种子1-2粒,长约2毫米,黑褐色。花期5-6月。
Herbs perennial, cespitose, (3-)7-25(-30) cm tall, often woody at base, canescent throughout with sessile, 7-16-rayed stellate trichomes. Stems usually erect or ascending, often several from caudex, sterile shoots often several. Cauline leaves subsessile; leaf blade linear-lanceolate to linear-oblong, 0.4-2(-3) cm × (0.5-)1-3 mm, gradually smaller upward, base attenuate, apex acute. Racemes corymbose, simple on each stem. Fruiting pedicels divaricate, (3-)4-7(-9) mm, stout, straight, uniformly stellate or sometimes also with simple and forked trichomes. Sepals oblong, 2.5-3 × 1-1.5 mm, deciduous or rarely persistent, stellate. Petals yellow, broadly spatulate, (4.5-)5-7(-8) × (1-)2-3 mm, glabrous outside, caducous, base attenuate, apex rounded or emarginate. Filaments 2.5-4 mm; median pairs slender or slightly flattened above base, neither winged nor toothed; lateral pair with a minute, unilateral tooth just above base; anthers narrowly oblong, 0.7-1 mm. Ovules 2 per locule. Fruit broadly oblong or oblong-obovate, (3-)4-7 × 3-5 mm, apex emarginate and to 0.5 mm deep; valves not veined, 1 inflated, another concave, margin often not flat, glabrous or sparsely stellate; style 1.5-2.8(-3.5) mm, slender, glabrous. Seeds 2 per locule, ovate or oblong, 1.3-2 × 0.9-1.2 mm, compressed, not margined. Fl. May-Jun, fr. Jul-Aug. 2n = 16.
北方庭荠生长环境
生长草坡、沙地、黑土地。