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BIRTHWORT Aristolochia clematitis (Aristolochiaceae) Height to 80cm. Upright, unbranched perennial of scrubby places. FLOWERS are yellow, tubular, 20-30mm long, foetid-smelling, the swollen base trapping pollinating insects; borne in clusters (Jun-Aug). FRUITS are green and pear-shaped. LEAVES are heart-shaped and strongly veined. STATUS-Rare and declining; a relict of cultivation for midwifery.