Eurasian P. nigra. That hybrid, P. ×rollandii Rouleau, which was originally thought to have involved P. ×canadensis, itself a hybrid offspring of P. nigra, has
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of Mexico to central Chile. Salix humboldtiana is closely related to S. nigra in its generally narrow leaf blades, which are not glaucous abaxially. The
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this variety only from Mexico. Intermediates between J. microcarpa and J. nigra (q.v.) are also known. None. None. window.propertiesFromHigherTaxa=[{"rank":"genus"
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Specimens intermediate between Juglans major and both J. microcarpa and J. nigra are discussed under the latter species. None. None. window.propertiesFro
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laevis (= Q. ×asheana Little), Q. marilandica (= Q. ×cravenensis Little), Q. nigra (= Q. ×caduca Trelease), and Q. phellos (E. J. Palmer 1948); with Q. pumila
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all of these names are ultimately based, is conspecific with that of P. nigra, and thus mollis and lanata are misapplied as infraspecific epithets of P
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highly brittle at base; pistillate adaxial nectaries oblong (swollen). Salix nigra 3 Branches yellow-brown to gray-brown; capsules 6-7 mm; stipules on early
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misidentified as C. nigrescens (or one or another of its synonyms) or as C. nigra. The elongate, often recurved, setose-ciliate tips of the phyllary appendages
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hybridize with C. aquatilis and has been observed to form hybrids with C. nigra. Standley, L. A. 1989. Taxonomic revision of the Carex stricta complex in
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from Greenland are based on plants of Carex subspathacea or hybrids of C. nigra with C. subspathacea or C. lyngbyei. Previous records from northern Northwest
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arkansana reportedly hybridizes with Q. incana (= Q. ×venulosa Ashe) and Q. nigra (D. M. Hunt 1986; W. H. Duncan and M. B. Duncan 1988). While agreeing that
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1970); with Q. arkansana, Q. inopina, Q. marilandica, Q. myrtifolia, Q. nigra, Q. phellos, Q. pumila, and Q. shumardii (D. M. Hunt 1989); and with Q. incana
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Trelease) and Q. incana (E. J. Palmer 1948); and with Q. marilandica, Q. nigra, Q. pagoda (= Q. ×ludoviciana Sargent), Q. palustris, Q. rubra, Q. shumardii
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Duncan 1988). It reportedly hybridizes with Q. falcata, Q. incana, and Q. nigra (H. A. Fowells 1965); with Q. hemisphaerica, Q. marilandica, Q. myrtifolia
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misidentified as Q. sinuata, which it superficially resembles, or as Q. nigra, a red oak with similarly shaped leaves. It is easily distinguished from
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×beaumontiana Sargent), and Q. marilandica (E. J. Palmer 1948); with Q. nigra, and Q. pagoda (S. A. Ware 1967; R. J. Jensen 1989); and with Q. phellos
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included S. interior (subg. Longifoliae) along with S. amygdaloides and S. nigra (placed here in subg. Protitea); 1b) included Asian S. chaenomelioides (subg
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Plants with young, expanding leaves sometimes are mistaken for Quercus nigra, a member of the red oak group. None. Quercus sinuata var. breviloba, Quercus
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America (Guatemala). Hybrids: Salix caroliniana forms natural hybrids with S. nigra. Hybrids with S. amygdaloides have been reported (N. M. Glatfelter 1898);
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Jepson 1909–1943, vol. 2). Hirschfeldia incana can be confused with Brassica nigra because both have fruits appressed to the rachis. The former is distinguished
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