花鸟图鉴 › 花卉

量天尺

Dragon fruit cactus

Selenicereus undatus · 仙人掌科 Cactaceae

量天尺
摄影:Tiago Lubiana,来自 Wikimedia Commons,公有领域 / CC0 授权。照片未经修改(仅缩放)。
颜色
白、黄
地区
新加坡与热带亚洲
花期
夏、秋
花形
大花头

识别特征

攀援或蔓生的仙人掌,岩生或半附生,茎三棱、绿色、有波状边缘和小刺座,靠气生根爬上岩石、树干和墙,可高 10 米以上。花极大,长 25 到 30 厘米,白色,外轮花被片黄绿,夜间开放、黎明凋谢,有香气,「霸王花」「量天尺」即它;果实就是火龙果(白肉品种),红皮带绿鳞片。可能是杂交起源。

栖息环境

原产地的干林和岩坡;现广泛作果树种植于热带和亚热带,也作观赏藤本爬墙,在福建、广东、海南、广西和台湾归化。

分布

原产墨西哥南部到洪都拉斯,全球热带亚热带广泛栽培;中国华南和台湾大面积种植火龙果,新加坡的庭院和墙头有栽培,日本冲绳有栽培。

花期

5 到 10 月夜间开花,华南 6 到 9 月;一朵花只开一夜。果期 6 到 12 月。

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。

夜间开放是全部的难点:傍晚守着将开的花蕾,用三脚架和持续光源(或月光加长曝光),花在晚上九十点全开,黎明前合拢。巨大的白花在暗夜里减半档,别用正面闪光。果园里成排的架子和挂着的火龙果是白天的题材。

适合的摄影风格

夜间开放的巨大白花;果园的架子与红果。

相似物种

昙花(Epiphyllum oxypetalum,茎扁平、无刺,花相似,不结火龙果);红肉火龙果(Selenicereus costaricensis);仙人掌类的其他夜花。

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

Dragon fruit cactus

量天尺

Selenicereus undatus · Cactaceae

Dragon fruit cactus
Photo: Tiago Lubiana, via Wikimedia Commons, public domain / CC0. Unmodified apart from resizing.
Colour
white, yellow
Region
Singapore and tropical Asia
Season
summer, autumn
Shape
large head

Identification

A climbing or sprawling cactus, lithophytic or hemiepiphytic, with three-angled green stems with wavy margins and small areoles, climbing rocks, trunks and walls by aerial roots to 10 m or more. Huge flowers 25–30 cm long, white with yellow-green outer tepals, opening at night and fading by dawn, fragrant; the fruit is the white-fleshed dragon fruit, red-skinned with green scales. Possibly of hybrid origin.

Habitat

Dry forest and rocky slopes in its homeland; now widely grown as a fruit crop in the tropics and subtropics and as an ornamental wall climber, naturalised in Fujian, Guangdong, Hainan, Guangxi and Taiwan.

Distribution

Native from southern Mexico to Honduras and grown throughout the tropics and subtropics; dragon fruit is farmed on a large scale in southern China and Taiwan, it climbs garden walls in Singapore, and it is grown in Okinawa.

Season and behaviour

Night flowers from May to October, June to September in southern China; each flower lasts one night. Fruit June to December.

Photography tips

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

Night opening is the whole difficulty: watch a bud due to open at dusk, with a tripod and continuous light (or moonlight and a long exposure); the flower is fully open around nine or ten at night and closes before dawn. The huge white flower in darkness wants half a stop under and no frontal flash. Rows of trellises and hanging fruit in an orchard are the daytime subject.

Photographic styles

A giant white flower opening at night; trellises and red fruit in an orchard.

Similar species

Queen of the night, Epiphyllum oxypetalum (flat spineless stems, similar flower, no dragon fruit); red-fleshed pitaya, Selenicereus costaricensis; other night-flowering cacti.

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