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白三叶草

White clover|シロツメクサ

Trifolium repens · 豆科 Fabaceae

白三叶草
摄影:Ivar Leidus,来自 Wikimedia Commons,以 CC BY-SA 4.0 授权。照片未经修改(仅缩放)。
颜色
白、粉
地区
日本与温带东亚
花期
春、夏
花形
花簇

识别特征

低矮的多年生草本。三出复叶,小叶光滑、椭圆到卵形,叶柄长,通常有浅色或深色的「V」形斑;茎作匍匐茎,一年爬 18 厘米,在节上生根,常铺成垫子,叶是「三叶草」符号的原型,偶尔有四片或更多小叶。花序头状,直径 1.5 到 2 厘米,白色小花常带一点粉或奶油色,随植株老去加深,生在约 7 厘米的花梗顶端。

栖息环境

草坪、公园、路边、牧场和河滩,是栽培最广的三叶草,作牧草引种后在草地上极普遍。

分布

原产欧洲、北非和西亚,广泛引入世界各地,北美的草地尤其普遍;中国南北各地均有分布,日本全境常见;新加坡无。

花期

4 到 8 月开花,北方晚、南方早;春末草坪上的白花最密集,秋季零星。

拍摄建议

以下为 FilmAnalysis 编辑的拍摄经验,不是资料来源中的内容。

贴着草坪趴下,让白色花球在绿色里成浅景深的点阵;微距拍单个头状花序,能看出它由几十朵小蝶形花组成。寻找四叶草本身就是拍摄前的游戏。白花减半档,蜜蜂来时 1/1600 秒。

适合的摄影风格

草坪上白色的点阵;小花球的微距。

相似物种

红车轴草(花红紫,叶上有「V」斑、更大);杂种车轴草(花粉白、茎不匍匐);酢浆草的叶是心形而非椭圆。

相关徽章

暂无。本种还没有经过验证的照片识别,所以没有对应的徽章:图鉴里有名字不等于照片里有证据。

本页插图为 FilmAnalysis 原创绘制。照片来自维基共享资源,授权和作者见图下说明。

收录缘由:本种来自 赏花清单(GBIF 分类骨干与维基数据核对)。名称以GBIF 分类骨干和维基数据为准,事实依据下列资料来源,照片识别暂不提供。

资料来源

Flora & Birds › Flowers

White clover

白三叶草 · シロツメクサ

Trifolium repens · Fabaceae

White clover
Photo: Ivar Leidus, via Wikimedia Commons, licensed CC BY-SA 4.0. Unmodified apart from resizing.
Colour
white, pink
Region
Japan and temperate East Asia
Season
spring, summer
Shape
cluster

Identification

A low herbaceous perennial. Trifoliolate leaves with smooth elliptic to egg-shaped leaflets on long petioles, usually with light or dark V markings; the stems act as stolons creeping up to 18 cm a year and rooting at the nodes, so it forms mats; the leaf is the shamrock, and sometimes carries four or more leaflets. Flower heads 1.5–2 cm across of whitish florets often tinged pink or cream, deepening as the plant ages, at the ends of 7 cm stalks.

Habitat

Lawns, parks, roadsides, pasture and river flats; the most widely cultivated clover, common in grassy places everywhere after introduction as forage.

Distribution

Native to Europe, North Africa and West Asia and widely introduced, especially common in North American grassland; found throughout northern and southern China and all of Japan; absent from Singapore.

Season and behaviour

Flowers from April to August, later in the north and earlier in the south; densest on lawns in late spring, scattered in autumn.

Photography tips

These are the FilmAnalysis editors' notes, not content from the sources.

Lie on the lawn so the white heads become a shallow-focus pattern of dots in green; a macro of one head shows the dozens of tiny pea flowers it is made of. Hunting for a four-leaf clover is the game before the picture. Half a stop under for white, 1/1600 s when bees arrive.

Photographic styles

Dots of white across a lawn; macro of a small flower ball.

Similar species

Red clover (red-purple heads, larger V-marked leaves); alsike clover (pink-white heads, non-creeping stems); woodsorrel leaves are heart-shaped rather than elliptic.

Related badge

None yet. No validated photo recognition exists for this species, so no badge is tied to it: a name in the encyclopedia is not evidence in a photograph.

The illustration is original FilmAnalysis artwork. The photograph is from Wikimedia Commons; its licence and author are under it.

Why it is listed: this species comes from the Flower checklist (GBIF backbone and Wikidata verified). Names follow the GBIF backbone and Wikidata; the facts follow the sources below; photo recognition is not offered.

Sources