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Symphyotrichum speciesSymphyotrichum boreale (Torrey & A. Gray) Á. Löve & D. Löve Taxon 31: 358. 1982. Luc Brouillet, John C. Semple, Geraldine A. Allen, Kenton
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The most basal species appears to be the isolated S. chapmanii (n = 7), a taxon that was unusual in Eurybia (x = 9) on morphologic and cytologic grounds
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unusual allopolyploid phytogeographically is Asplenium adiantum-nigrum, the parents of which are known only in the Old World. These reticulate relationships
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parachute of fine hairs that can carry them tens to hundreds of meters from the parent plant. Seeds that land on water can float for several days because of the
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diploid hybrids, he has learned much about the degree of relationship of the parents, sometimes assigned here to different genera. He has argued that, in contrast
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constituting one of the first known examples of backcrossing and formation of a new taxon by unreduced spores from a sterile hybrid. According to V. M. Morzenti (1967)
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neoalaskana Sargent) is common throughout Alaska and the Yukon, where the parent species frequently come into contact (E. Hultén 1941–1950, vol. 4; E. Lepage
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great group, subgroup, family, and series. Soils are grouped within a given taxon on the basis of sharing certain features. The order represents the greatest
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those in adjacent, more exposed areas; whether they constitute a distinct taxon or merely a forest ecotype is not clear. Plants growing at higher elevations
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vaginatus (= P. × bottnicus Hagström), with this species as a putative parent has been described under the genus Potamogeton. Correll, D. S. and M. C
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and the over-wintering bud typically form at a marked distance from the parent shoot, resulting in clonal colonies dominated by sterile plants. The southern
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to support this segregation, the plants are best not treated as a formal taxon, particularly considering the extensive variation and hybridization associated
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hybridogenous taxon, Amaranthus ×tucsonensis Henrickson, was recently described from Arizona (J. Henrickson 1999). It was suggested that one of its parents is A
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occasional hybrids—some intermediate, some apparent backcrosses approaching one parent or the other. In none of the hybrids did C. H. Uhl find evidence of irregularity
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J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis. A related taxon, Dryopteris intermedia subsp. maderensis (J. Milde ex Alston) Fraser-Jenkins
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American Flora, Novon, Systematic Botany, Systematic Botany Monographs, and Taxon, among others. Taxa treated in full include native species, native species
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was based largely on the premise that Q. nuttallii occurred "...with the parent species throughout a large part of the latter's southern range (Mississippi
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occurs frequently within the common range of the two parents and is therefore considered to be a taxon of recent origin. Fertility is variable; most of the
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