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Grass vetchling is an annual plant, with an erect stem branching from the base, and growing to a height of about 2 feet (0.7 m). It is entirely without true leaves, leaflets or tendrils. The leaf stalk, however, is flattened out until it closely resembles a blade of grass ending in a fine point, and the stipules at its base greatly help the deception.
The flowers are succeeded by long, slender, straight pods, which are at first very flat, but become cylindrical when the contained peas are fully developed.
- Stokoe, W.J. The Observer's Book of Wild Flowers (1965 ed.). Frederick Warne & Co. Ltd. p. 88.
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