北方庭薺檢視原始碼討論檢視歷史
北方庭薺 |
中文學名:北方庭薺 拉丁學名:Alyssum lenense Adams 界:植物界 科:十字花科 屬:庭薺屬 種:北方庭薺 分布區域:[[黑龍江]、內蒙古。 |
北方庭薺(學名:Alyssum lenense)為十字花科庭薺屬下的一個變種。 [1]
北方庭薺形態特徵
北方庭薺,多年生草本,高5-15(-20)厘米,密被星狀毛,呈灰綠色;有時莖基部與葉成淡紫色,分枝多,先鋪散,後上升,常成叢狀生長。
能育枝與不育枝上的葉相似,偶有不育枝上葉變小;葉無柄,葉片長圓狀條形或長圓狀披針形,長1-1.7(-2)厘米,寬1-2.5毫米,頂端急尖,基部漸窄。
花序傘房狀,果期極伸長,花梗長2-4毫米;萼片長圓狀橢圓形,長2.4-3.5(-4)毫米,有白色邊緣;花瓣黃色,寬倒卵狀楔形,長5-6毫米,寬2-3毫米,頂端鈍或截形,爪部楔形。
短角果橢圓形,長4-6(-7)毫米,寬3-4毫米,花柱宿存;果瓣頂端微缺,中間凸起,無毛;果梗長5-10毫米,斜向上或水平展開。
每室種子1-2粒,長約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.
北方庭薺生長環境
生長草坡、沙地、黑土地。