崗棯 rose myrtle

五月走到郊外,到處都見桃紅小可愛,因為崗棯花期到了。

崗棯又叫桃金娘,是速生及耐旱的本地原生植物,產於中國南部各省,亦分布於日本、印度及東南亞等地。

rose myrtle is also known as downy myrtle and ceylon hill gooseberry. it is native to hong kong and commonly seen in southern china, japan and se asia. it has become an invasive species in some countries however. this time of the year you are bound to see these adorable pink ladies when you are out in countryside. hikers love their fruit (july-september) as it is juicy in sour sweetness.

崗棯 rose myrtle (rhodomyrtus tomentosa) – plantae kingdom | 被子植物門 magnoliophyta division| 雙子葉植物綱 magnoliopsida class|桃金娘目 myrtales order |桃金娘科 myrtaceae family | 桃金娘屬 rhodomyrtus genus| 種:桃金娘 r. tomentosa species

細看崗棯的植物學資料,從目、科、屬到種都是桃金娘。不禁查看桃金娘目。

維基、百度百科說:桃金娘目植物最早的化石見於上白堊紀,絕大多數為木本植物,雄蕊排列成兩輪,一般為花瓣的兩倍。桃金娘目共有12科。可能從薔薇目中演化出來,因為兩者有許多相同的地方,如花為兩性,五基數,花萼凹陷,雄蕊多數等,但桃金娘目花因為異花授粉的雄蕊退化為定數,萼筒加深。

大英百科則說桃金娘目14科,目下大部分品種都屬於桃金娘科(myrtaceae family)和野牡丹科 (melastomataceae family)。桉樹就是屬於桃金娘目。

rose myrtle is from the order of myrtales, a big order with 14 families, 380 genera, and about 11,000 species (according to britannica). interestingly, eucalyptus also belong to the same order.

 

參考 references:

  • 桃金娘是十分常見的常綠灌木,高約1至2米。嫩枝有白色柔毛。葉對生,長橢圓形,長3至8厘米,寬1至4厘米,有三條明顯的主脈,葉面光滑,葉背被灰色絨毛。粉紅色的花朵十分美麗,有五片花瓣,雄蕊多數,在翠綠的草坡或灌叢中分外明顯。漿果呈壺形,長約1.5 至2厘米,成熟時深紫色,內有很多細小的種子。花期:五月至六月。果期:七月至九月。《香港植物標本室
  • rhodomyrtus tomentosa is an evergreen shrub growing up to 4 m-12 feet tall. the leaves are opposite, leathery, 5-7 cm long and 2-3.5 cm broad, three-veined from the base, oval, obtuse to sharp pointed at the tip, glossy green above, densely grey or rarely yellowish-hairy beneath, with a wide petiole and an entire margin. the flowers are solitary or in clusters of two or three, 2.5-3 cm diameter, with five petals which are tinged white outside with purplish-pink or all pink.
  • the fruit is edible, 10-15 mm long, purple, round, three or four-celled, capped with persistent calyx lobes, soft, with 40-45 seeds in a double row in each cell; seed dispersal is by frugivorous birds and mammals. seed production and germination rates are high. (source:wikipedia)
  • the myrtle order of flowering plants, composed of 14 families, 380 genera, and about 11,000 species distributed throughout the tropics and warmer regions of the world. the majority of these species belong to just two families, melastomataceae and myrtaceae. myrtales includes many trees (notably eucalyptus), shrubs such as the classic myrtle, several food and spice genera, and many ornamental plants. myrtales is placed in the basal rosid group of the core eudicots in the angiosperm phylogeny group ii (apg ii) botanical classification system (source: britannica)
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