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15. Lathyrus sativus Linnaeus, Sp. Pl. 2: 730. 1753.
家山黧豆 jia shan li dou
Annual herbs, 30-50(-70) cm tall. Stem suberect, glabrous, winged. Leaves with tendril at apex; rachis winged; stipules semisagittate, 18-25 × 2-5 mm; leaflets 1-paired, lanceolate to linear, 18-25 × 2-5 mm, with parallel veins, margin entire. Raceme 1(or 2)-flowered; rachis 3-6 cm. Calyx campanulate, subequally toothed, 2-3 × as long as tube. Corolla white, blue, or pink, 12-15(-24) mm. Ovary linear; style twisted. Legume subelliptic, 2.5-3.5(-4) cm, 2-winged along sutures. Seeds smooth. Fl. Jun-Jul, fr. Aug.
Cultivated as a fodder crop in N China, casual elsewhere [widely cultivated and naturalized; of uncertain origin].
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