纖細碎米薺
纖細碎米薺 |
中文學名:纖細碎米薺 拉丁學名:Cardamine gracilis (O. E. Schulz) T. Y. Cheo et R. C. Fang 界:植物界 門:被子植物門 綱:雙子葉植物綱 亞 綱:原始花被亞綱 目:罌粟目 亞 目:白花菜亞目 科:十字花科 族:南芥族 屬:碎米薺屬 亞 屬:碎米薺組 分布區域:雲南省 生 境:濕草甸 是否中國特有:是 是否引種栽培:非人工引種栽培 |
纖細碎米薺(學名:Cardamine gracilis)是十字花科碎米薺屬的植物,是中國的特有植物。
分布於中國大陸的雲南等地,生長於海拔2,900米的地區,多生長於沼澤地,目前尚未由人工引種栽培。 [1]
目錄
纖細碎米薺形態特徵
多年生草本,高20-30厘米,全體無毛。根狀莖延長,匍匐,於節上密生鬚根。
莖基部傾臥,上部直立,不分枝,表面有溝棱。莖上着生多數葉片,羽狀複葉,無葉柄,小葉形小,7-13對,排列緊密,頂生小葉與側生小葉大小近似,頂生小葉倒卵形或近於圓形,長3-8毫米,寬1.5-7毫米,頂端圓,邊緣有2-4個鈍齒,有短柄,側生小葉卵形或狹長卵形,頂端鈍,邊緣有1-4個鈍齒或全緣,基部不對稱;生於莖上部的葉,小葉較小較狹。
總狀花序頂生,花梗細,長2-12毫米;萼片長卵形,長4-5毫米,邊緣膜質,內萼片基部呈囊狀;花瓣紫色或玫瑰紅色,倒卵形,長6-7毫米,頂端截形,基部闊楔形;短雄蕊長約4.5毫米,長雄蕊長約5.5毫米,花絲扁平,稍擴大;雌蕊略短於長雄蕊,花柱短,柱頭頭狀。
果實未見。花期5-7月。
Herbs perennial, 10-35(-50) cm tall, glabrous throughout, semiaquatic. Rhizomes slender, to 10 cm or longer, 0.5-3 mm in diam. Stems erect, simple, striate angled, rooting from lower and sometimes middle nodes. Basal rosettes absent. Cauline leaves 10-20 per stem, (1.5-)2.5-7.5(-9) cm × (1.5-)4-14(-17) mm; petiole absent or rarely to 2 mm; terminal leaflet narrowly obovate, oblong, or rarely broadly ovate, (2-)3-8(-9) × (0.5-)1.5-5(-7) mm, petiolule 0.5-2 mm, base cuneate or rarely obtuse, margin obscurely 1-3-toothed on each side, apex acute, submucronate; lateral leaflets (6 or)7-12(-15) pairs, linear or narrowly oblong, asymmetric, slightly smaller than terminal lobe, sessile or rarely with a petiolule to 0.5 mm, base oblique, proximal margin 1- or 2(or 3)-toothed, distal margin entire or rarely obscurely 1- or 2-toothed, apex acute; proximal pair of lateral leaflets auriclelike, attached at or just above node, often giving appearance of amplexicaul leaf base. Racemes terminal, 10-20-flowered. Fruiting pedicels divaricate, 0.8-2.2 cm, slender. Sepals oblong or ovate, 3-4 × 1.2-2 mm, spreading, margin membranous, base of lateral pair subsaccate. Petals lavender with darker veins, spatulate, 6-8 × 2-3 mm, spreading, apex rounded. Filaments spreading, dilated at base, subequal, median pairs 3.5-5 mm, lateral pair 3-4.5 mm; anthers narrowly oblong, 1.3-1.6 mm. Ovules 10-14 per ovary. Fruit linear, 2-4 cm × ca. 1.5 mm; gynophore ca. 0.5 mm; valves smooth, glabrous; style 4-6 mm. Seeds brown, oblong, 1.7-2 × ca. 1.3 mm, winged all around; wing ca. 0.4 mm wide. Fl. Jun-Aug, fr. Jul-Oct.
纖細碎米薺生長環境
生長於海拔2900米的沼澤地。