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Log in through your institution. Ludwigia sect. Microcarpium, which consists of 14 species distributed mainly in the southeastern United States, is the second-largest section in the genus, the largest being the phylogenetically central sect.
Myrtocarpus of South America. Plants of Ludwigia sect. Microcarpium are morphologically diverse; they form a polyploid complex of four diploids, eight tetraploids, two hexaploids, and one octoploid. They are facultatively autogamous herbaceous plants capable of reproducing both sexually and asexually forming stolons late in the flowering season.
Based on extensive crossing experiments as well as field and herbarium studies, the relationships among species of this section have been clarified.
Internal genetic barriers between species are nonexistent, and natural hybridization is fairly common. Among the diploid species, L. The two species, however, differ chromosomally by one reciprocal translocation.
F1 hybrids between them are vigorous, have ca. Ludwigia stricta, the Cuban endemic, is apparently most closely allied to L. Ludwigia microcarpa, in contrast, has spatulate-obovate leaves, small, apetalous flowers, and minute obconical capsules. Artificial hybrids between L. Ludwigia microcarpa probably evolved relatively early from outcrossing ancestors.
Although the nine tetraploid members in sect.
Microcarpium are sharply distinct morphologically, they can be crossed in any direction in the experimental greenhouse and form fertile F1 offspring. Natural hybrids in plants of this group are also fairly common and in some cases blur the boundaries of the species.
Somewhat surprisingly, none of the extant diploid species are considered to be direct ancestors of the tetraploids, based on cytogenetic studies.
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The two hexaploid species, L. The affinity of L. Hybrids between L. Based on its morphology and the cytology of hybrids involving it, L. Ludwigia simpsonii, on the other hand, is closely related to L. The two species are unique in sect. Microcarpium in having loculicidal capsules and, together with the diploid L. Cytogenetic and morphological studies suggest that the octoploid L. Ludwigia microcarpa is involved in the formation of the hexaploid L. The other progenitors of L. Dantia or populations ancestral to them with apetalous flowers, opposite leaves, and a prostrate habit are likely candidates.
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Alternate access options. Get Started Already have an ? Abstract Ludwigia sect.
Journal Information Inthe Annals of the Missouri Botanical Garden, the flagship journal of the scientific publications program, was founded to contain research contributions from staff members at the Garden, graduate students of the Henry Shaw School of Botany of Washington University, and from visiting botanists associated with the Garden.