Lathyrus tuberosus

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Lathyrus tuberosus (also known as the tuberous pea, tuberous vetchling, earthnut pea, aardaker, or tine-tare) is a small, climbing perennial plant, native in moist temperate parts of Europe and Western Asia. The plant is a trailer or weak climber, supported by tendrils, growing to 1.2 m tall. The leaves are pinnate, with two leaflets and a branched twining tendril at the apex of the petiole. Its flowers are hermaphroditic, pollinated by bees. The plants can also spread vegetatively from the root system. Lathyrus tuberosus is a perennial plant with edible tubers 3 to 5 cm (1.2 to 2.0 in) long attached to its stolons. The stem grows to 30 to 80 cm (12 to 31 in) and is sprawling, wingless and nearly hairless. The leaves are alternate with short stalks and narrow stipules. The leaf blades are pinnate with a single pair of broad lanceolate leaflets with blunt tips, entire margins and a terminal tendril. The inflorescence has a long stem and two to seven pinkish-red flowers, each 12 to 20 mm (0.5 to 0.8 in) long.