Showing papers on "Polygonum published in 1986"
TL;DR: Acorus calamus, Alisma plantago-aquatica, Bidens cernua, B. vulgata, Cyperus aristatus, Lythrum salicaria, Polygonum punctatum, Sagittaria latifolia, Scirpus americanus, Typha angustifolia
Abstract: Acorus calamus, Alisma plantago-aquatica, Bidens cernua, B. vulgata, Cyperus aristatus, Lythrum salicaria, Polygonum punctatum, Sagittaria latifolia, Scirpus americanus, Typha angustifolia
136 citations
TL;DR: In this article, a new isocoumarin polygonolide which inhibits the reversed passive Arthus reaction has been isolated from the methanol extract of the root of Polygonum hydropiper.
102 citations
TL;DR: Individuals of the two species were more similar to one another in response to the resource gradients when both were started from seed, than were individuals of P. virginianum grown from seed and from rhizomes.
Abstract: The responses of Polygonum pensylvanicum L, an early successional annual, and of Polygonum virginianum L, a late successional perennial, were examined along discontinuous gradients of soil moisture, light and nutrient availability In the case of P virginianum both individuals grown from seed and individuals grown from rhizomes were examined The results show that variation in the response of individuals of a species of different age to environmental variation is as great as that found between the two congeneric species of different successional habitats In general, individuals of the two species were more similar to one another in response to the resource gradients when both were started from seed, than were individuals of P virginianum grown from seed and from rhizomes Potential differences in stored reserves (starting capital) between rhizomes and seeds appeared to have little effect upon responses to resource availability A number of plant characters were found to vary along the gradients in ways that were unique to the character, the gradient, and the age of the individual These characters included aspects of leaf size, shape, and orientation, as well as whole plant architecture Many if not all of these characters are likely to have significant effects upon the functioning of plants The origin of this difference in response to the gradients of individuals of P virginianum of differing age may be ontogenetic or may reflect differences in genetic composition created by recombination
24 citations
TL;DR: The hypothesis that the seedling stage of the plant life cycle is the stage most susceptible to permanent effects by the chemicals released from decomposing litter is supported.
18 citations
Journal Article•
16 citations
Journal Article•
1 citations
TL;DR: As a result of comprehensive systematic study on Polygonum section Echinocaulon, three new nomenclatural changes are made:P.
Abstract: As a result of comprehensive systematic study onPolygonum sectionEchinocaulon, three new nomenclatural changes are made:P clarkei stat et nom nov,P subsagittatum stat nov, andP senticosum varsagittifolium stat nov
1 citations
TL;DR: In this paper, the air-dry raw material was exhaustively extracted with 96% and 80% ethanol in the boiling water bath, and the extracts were investigated by two-dimensional chromatography on FN-15 paper (direction I: propanol-formic acid-water (2:5:5); direction II: butan-l-ol-glacial acetic acid water (40:12:28).
Abstract: To isolate the flavonoids, the air-dry raw material was exhaustively extracted with 96% and 80% ethanol in the boiling water bath. The extracts were investigated by two-dimensional chromatography on FN-15 paper (direction I: propanol-formic acid-water (2:5:5); direction II: butan-l-ol-glacial acetic acid-water (40:12:28). Both in the leaves and in the epigeal part, 16 substances of flavonoid nature were determined, namely: two free aglycones -quercetin and kaemferol and 14 glycosides, of which six were identified. The remaining glycosides were present in insignificant amounts.