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Item Description Kim, Insun en_US Carr, Gerald D. en_US 2008-04-18T02:14:37Z 2008-04-18T02:14:37Z 1990-04 en_US
dc.identifier.citation Kim I, Carr GD. 1990. Reproductive biology and uniform culture of Portulaca in Hawaii. Pac Sci 44(2): 123-129. en_US
dc.identifier.issn 0030-8870 en_US
dc.description.abstract Ten taxa of Portulaca that occur in Hawaii (P. lutea, P. molokiniensis, P. oleracea, P. pi/osa, P. sclerocarpa, P. villosa, two imperfectly known species, and two cultivars) were included in a study of reproductive biology and uniform cultivation. The response of plants under uniform conditions upholds the merger of the reputed Hawaiian endemic P. cyanosperma with P. pilosa. All Portulaca taxa in Hawaii are autogamous, and in most instances large numbers of seeds are set even when the flowers are totally undisturbed. Some taxa are facultatively cleistogamous, but even in chasmogamous forms the flowers are open for only about 3-9 hr. The cultivars were the only taxa observed to attract pollinators, but P. molokiniensis, which was not studied in nature, appears to have adaptations for biotic pollination. Most of the portulac as studied have capsular fruit that require about 13-17 days to mature, but in P. sclerocarpa the fruits are thick-walled and indehiscent and require about 28 days for maturation. The life cycle ranges from about 8 weeks in most cases to several months in P. molokiniensis. However, individuals of most taxa typically flower and fruit man y times during one growing season. Seeds were generally nondormant, but partial seed dormancy was encountered in P. molokiniensis. en_US
dc.language.iso en-US en_US
dc.publisher University of Hawaii Press en_US
dc.title Reproductive Biology and Uniform Culture of Portulaca in Hawaii en_US
dc.type Article en_US
dc.type.dcmi Text en_US

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