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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

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

unusual allopolyploid phytogeographically is Asplenium adiantum-nigrum, the parents of which are known only in the Old World. These reticulate relationships

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

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

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)

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

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

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

vaginatus (= P. × bottnicus Hagström), with this species as a putative parent has been described under the genus Potamogeton. Correll, D. S. and M. C

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

to support this segregation, the plants are best not treated as a formal taxon, particularly considering the extensive variation and hybridization associated

hybridogenous taxon, Amaranthus ×tucsonensis Henrickson, was recently described from Arizona (J. Henrickson 1999). It was suggested that one of its parents is A

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

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

American Flora, Novon, Systematic Botany, Systematic Botany Monographs, and Taxon, among others. Taxa treated in full include native species, native species

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

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

included in G. xlaxa (Scribn.) Scribn. [=G. canadensis var. laxa]; that taxon often produces viable seed, indicating that it is not a hybrid. None. None

demissa Griffiths is apparently a hybrid between O. oricola and an unknown taxon (B. D. Parfitt and M. A. Baker 1993), likely to be O. littoralis. The hybrid

synonymy of the species name of either “parent.” We believe instead that the type of robusta belongs to the “taxon” that has been called bracteosa. rubricaulis:

hybridized (probably repeatedly, even at present), producing the highly variable taxon referred to here as O. tortispina, which then spread eastward onto the plains

niphoclada is so extensive that it is not recognized here as a separate taxon. Hybrids: Salix niphoclada forms natural hybrids with S. glauca var. acutifolia

sparsiflora) are sufficiently similar that they might be considered a single taxon if their respective parentages and disjunct geographic ranges were not taken

vary considerably with respect to climatic gradients and the character of parent rocks. In general, the soils (Inceptisols, Spodosols, and Alfisols) derived