Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Tribe: Loteae
Genus: Lotus
Species:     L. tenuis
Binomial name: Lotus tenuis
Synonym: Lotus glaber
Common name:  Narrow-leaved birdsfoot trefoil, Narrowleaf trefoil,  Slender trefoil, Creeping trefoil, Prostrate trefoil, Deer vetch.

Lotus tenuis is a flowering, perennial plant of the pea family Fabaceae, native to the north-west and east Europe, Mediterranean basin, south-west and East Asia. It has become naturalised in New Zealand. It tends towards prostrate growth habit on account of weak stems but it will climb through shrubs up to a height of 1.5 m plus.
It is suited to humid-temperate environments and adapts to wasteland, swampy conditions, heavy soils and to saline and alkaline soils.
The inflorescences bear 8-10 lemon yellow florets, 7-10 mm. The plant is tap-rooted with extensive lateral root branching, especially in upper soil layers.

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Flowering just starting early December.
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A patch of Lotus tenuis in flower.Narrow-leaf Bird s-foot Trefoil Lotus glaber Syn Lotus tenuis -25.JPG 

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Narrow-leaf Bird s-foot Trefoil Lotus glaber Syn Lotus tenuis -26.JPG

Flowers with developing seed pods
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Seedpods
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Photographed on the Tongariro Alpine Crossing. Elevation 1450 m.
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The leaves.
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Thanks to Wikipedia for text and Information:  http://creativecommons.org/licenses/by-sa/3.0/