Aristolochia rotunda Aristolochia rotunda , commonly known as smearwort or round-leaved birthwort , is a herbaceous perennial plant native to Southern Europe .Etymology The genus name Aristolochia derives from the Greek words αριστος meaning "the best" and 'lochéia' meaning ' childbirth', for the old use in promoting uterine contractions . The Latin name of the species rotunda refers to the rounded shape of the leaves.The root reaches in length and sometimes seems out of proportion to the slenderness of the plant. The unbranched stem has alternate, large, smooth-edged, heart-shaped and stalkless leaves that clasp the stem with enlarged, basal lobes. The solitary flowers have an unpleasant odor and they are tubular, about long, yellowish-green with a prominent, dark-brown or dark purple flap, both arising from the axils of the leaves. The flowering period extends from April through June.Reproduction The flowers of Aristolochia rotunda are hermaphrodite are pollinated by midges and other small insects, attracted by the smell and by purple-brown color of the flowers. The small hairs inside the cup prevent the flies from coming out and flying away. After the pollination these hairs sag and allow them to escape. This species is the only host plant of the caterpillars of a beautiful uncommon butterfly. Eating the leaves of the plant the larvae this insect ingest aristolochic acid that make them poisonous to birds.Distribution This plant is common in Mediterranean countries. It is rarely naturalized in the British Isles .Habitat These plants occur along the banks of canals, edges of ditches and fields, sides of roads, meadows, slopes and forests. They prefer chalky soils and moist, shady areas, at an altitude of above sea level .Chemical constituents A. rotunda contains aristolochic acids which are carcinogenic , mutagenic , and nephrotoxic .Subspecies Aristolochia rotunda subsp. rotunda , autonym Aristolochia rotunda subsp. insularis Gamisans Aristolochia rotunda subsp. reichsteinii E.NardiGallery Additional references Tela Botanica / 2000-2009 - Le réseau des Botanistes Francophones . Pignatti S. - Flora d'Italia - Edagricole – 1982, Vol. I, pag 135 Tutin, T.G. et al. - Flora Europaea , second edition - 1993 Björn Rulika, Stefan Wankeb, Matthias Nussa and Christoph Neinhuisb
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