Polygala Myrtifolia

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Polygala myrtifolia Polygala myrtifolia, the myrtle-leaf milkwort is an evergreen 2-4m tall South African shrub or small tree found along the southern and south-eastern coasts, from near Clanwilliam in the Western Cape to KwaZulu-Natal. It is a fast-growing pioneer plant, a typical fynbos component, and may be found on dunes, rocky places, along forest margins, beside streams, and in open grassland. It belongs to the milkwort family of Polygalaceae. Description The thin, oval, mucronate leaves, 25–50 mm long and up to 13 mm wide, are arranged alternately and have entire margins - some forms of P. myrtifolia have thin, needle-like leaves. The attractive mauve sweetpea-like flowers, which close at night, may also be pink, crimson or white, and have a characteristic brush-like tuft protruding from the keel. For pollination an intricate piston mechanism is used. The fruit is an oval, brown, dehiscent capsule which is narrowly winged. The species is often cultivated in South African gardens. Botanical taxonomy The genus of Polygala comprises some 360 species with a wide distribution in the tropics and temperate zones. 'Polygala' is interpreted as 'much milk' since the plant was thought to stimulate milk production in European cows - 'myrtifolia' translates as 'myrtle-shaped leaves'. This species has become naturalised in some of the coastal areas of Australia, Norfolk Island, New Zealand and California. This species is noted for its antibacterial and antifungal properties. Research conducted by the University of KwaZulu Natal found that aqueous extracts of P. myrtifolia proved effective against Candida albicans. .

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Biological Control Prospects for Polygala
72 Plant Protection Quarterly Vol.26(2) 2011 Mechanical and chemical control tech- niques are utilized to suppress P. myrtifo- Phytophagous organisms associated with the woody lia, but are generally only successful when shrub Polygala myrtifolia (Polygalaceae) and their applied to small areas where regular fol- low-up treatments can be implemented. potential for classical biological control in Australia In Australia, few phytophagous arthro- pods occur on P. myrtifolia, and herbivory Robin J. AdairA,D, Stefan NeserB and Val StajsicC damage is low to negligible. Low herbivo- A Department of Primary Industries, Bioprotection Research Division, ry pressure in Australia may contribute to PO Box 48, Frankston, Victoria 3199, Australia. the success of P. myrtifolia as an environ- B Plant Protection Research Institute, Agricultural Research Council, mental weed. In contrast, phytophagous species can cause substantial damage to Private Bag, X134, Pretoria 0001, South Africa. C P. myrtifolia in South Africa, and several National Herbarium of Victoria, Royal Botanic Gardens Melbourne, species have potential for classical biolog- Birdwood Avenue, South Yarra, Victoria 3141, Australia. ical control (Adair and Neser 1996). Al- D LaTrobe University, Bundoora, Victoria 3086, Australia. though P. myrtifolia has not been formally accepted as a target for biological control in Australia, this form of suppression is considered the only effective long-term Summary management option. Coastal ecosystems in southern Australia in Adelaide in 1845 (Carter et al. 1990). In this paper, the phytophagous biota have been invaded by the South African The first presumed wild collections of associated with P. myrtifolia and their po- shrub Polygala myrtifolia L. (Polyga- P.
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