銀葉合歡 white popinac

最近比較冷落樹木,一味說草本,或雀鳥。趕忙留意周圍的大樹。其實有很多題材,開花結果的羊蹄甲,爆白絨花的白千層,漸漸變紅的楓香、三角槭、落羽杉等等。

i’ve been concentrating on small plants and birds lately. feeling guilty, i felt that i have to write about some trees. there are many seasonal choices: bauhinia has been blossoming and fruiting; paper-bark are all fluffy with their white flowers; sweet gum and trident maple started turning red.

最終決定先寫銀合歡。

前一兩年,還沒有知道什麼是銀合歡的時候,冬天,乘搭巴士到元朗和大埔,沿途經過公路,旁邊不少樹木掛著搶眼的深木紅色的長形果實,紅綠相映,覺得冬日的樹木原來很吸引。

finally, decided to write about white popinac first. as i saw many of them few days ago at kam tin while birding with friends. probably because of the weather fluctuation, some white popinac are flowering, some of them are showing green pod and others having legume hanging all through.

white popinac legume

銀合歡與含羞草是近親。從葉片便一目了然:羽狀複葉,互生,小葉長橢圓形。

白色頭狀花序很可愛。帶狀莢果,革質,褐色,有光澤。果瓣內面有橫的稜條。種子扁平,褐色,一莢约十多枚。

white popinac is a close relative of mimosa. the pinnate leaves are easy proof. the adorable spherical heads formed by many white flowers are easily recognizable. but what drew my attention in the first place was its seed pods. it was winter, numerous reddish-brown pendants shimmered against the green from far along the highway to yuen long.

white popinac flowers

近日走到錦田觀鳥,一路看到不少銀合歡。有的在開花,有的果莢初現,有的果實已經成熟,並灑滿一地。

我覺得這樹很美。查閱資料,才知道銀合歡在農界、植物界,毀譽參半。幼葉及莢果含豐富蛋白質,可做牛群飼料;植物中含羞草素,對某些動物可能是毒素。牠是綠肥好材料,本身也有強的固氮作用。然而,在香港及其它不少地方,銀合歡被視為入侵品種。因為自然繁殖能力以及生命力強;樹根分泌的含羞草素,抑制他種植物生長,排他性極強,影響到附近環境的生物多樣性。

when i research on this plant, it is interesting to find out it is both an angel and demon. the plant is used as green manure, it is also efficient in nitrogen fixation. cattle feed on them and can easily gain weight. meanwhile it is considered an invasive plant because of its strong vitality and reproduction, as well as its invasive exclusivity (its roots release mimosine which can stop other plant from growing around).

white popinac legume2

銀葉合歡 white popinac (leucaena leucocephala) – 植物界 plantae kingdom | 被子植物門 angiospermae division | 雙子葉植物綱 lignosae class | 豆目 fabales order | fabaceae family 豆科 | mimosoideae subfamily含羞草亞科 | mimoseae tribe 含羞草族 | 銀合歡屬 leucaena genus | species種:銀合歡 l. leucocephala wiki

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