美麗紫色豆科 beautiful purple pea family

水黃皮 pongamia pinnata 、亮葉雞血藤 glittering-leaved millettia 、假地豆 desmodium heterocarpum = these three look alike yet are different. 三位紫色仙子,活于同一泥土上卻是不同個體。

水黃皮 pongamia pinnata

  • 落葉喬木deciduous tree
  • 海岸樹種,抗風、耐鹽 prefers coastal and riverine habitats
  • 葉面光亮潔淨,有柄長橢圓形或卵形。羽狀複葉。葉茂盛,重壓枝條,下垂生長shinny leaves. leaves with handles, oblong or oval in shape; can come in abundance and cast a burden to the plant, thus heads mostly down.
  • 總狀花序,花腋生。淡紫色蝶形。春秋開花raceme inflorescence, purple flowers
  • 莢果。扁平木質,略呈刀狀。成熟後不會裂開,果皮會保護種子隨水漂流,散播種子 the pod slightly resembles a knife and does not crack when it matures. instead it helps to spread the seeds by keeping them inside and float itself in water
  • 見於濕地公園 photo taken at wetland park

millettia pinnata – order: fabales 豆目 | family: papilionaceae蝶形花科 | tribe: millettieae | genus: millettia崖豆藤屬 | species: 水黃皮種m. pinnata

亮葉雞血藤 glittering-leaved millettia

  • 攀援灌木 climber scrub
  • 莖根折斷有紅色濃汁流出,像雞血,故得名。red thick fluid comes out from broken stem, therefore its chinese common name is chicken blood millettia
  • 橢圓形葉互生,羽狀複葉 leaf arrangement: pinnate
  • 紫色萼鐘狀,瓣外面近白色。圓錐花序頂生 pea-shaped flowers with petals pale in colour on the outside. inflorescence in cone
  • 莢果扁平,有褐色柔毛。the pod has soft brown hair
  • 見於北潭涌 photo taken at pak tam chung

millettia nitida benth. – order: fabales 豆目 | family: fabaceae | subfamily: faboideae/ papilionaceae 蝶形花亞科 | tribe: millettieae | genus: millettia崖豆藤屬 | species: m. nitida fabales

假地豆 desmodium heterocarpum

  • 小灌木 shrub
  • 生於山谷水旁灌叢或林中 prefers waterside in woods and forest
  • 小葉橢圓形至寬倒卵形
  • 圓錐花序,花腋生。花序軸有淡黃色長柔毛。紫色花萼寬鐘狀。cone-shaped inflorescence. the axis of the inflorescene has pale yellow soft hair. purple colour pea-shaped flowers
  • 莢果有4-9莢節,有小鉤狀毛 pods have four to nine segments and hooky hair
  • 產于雲南、四川、貴州、廣西、廣東、福建、臺灣、江西,南亞南亞 native to guangdong

desmodium heterocarpum – order: fabales | family: fabaceae豆科 | subfamily: faboideae | tribe: desmodieae | subtribe: desmodiinae | genus: desmodium 山螞蝗屬

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