outside cultivation, but at least three other species, A. calcarata Roscoe, A. nigra (Gaertner) B. L. Burtt, and A. officinarum Hance, may persist for many years
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disjunct in the Danube basin of central Europe, represented there by Crataegus nigra. Some of the most diagnostic features of this section are the usually short
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Streptanthus niger Greene Bull. Torrey Bot. Club 13: 141. 1886 Synonyms: Euklisia nigra (Greene) Greene Streptanthus glandulosus var. niger (Greene) Munz Treatment
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checkerspot (Euphydryas phaeton) on C. glabra as well as sawfly larvae (Macrophya nigra and Tenthredo grandis), which are known from C. glabra and C. obliqua. One
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Salix lucida × S. nigra (S. ×schneideri B. Boivin) seems to be a rare intersubgeneric hybrid between tetraploid S. lucida and diploid S. nigra. It is known
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haydenii are ladder-fibrillose. Although often sympatric with C. stricta and C. nigra, no hybrids appear to be formed. None. None. window.propertiesFromHigher
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Juglandaceae Juglans hindsii Juglans californica Juglans major var. major Juglans nigra Juglans cinerea Carya tomentosa Juglans microcarpa John Myers John Myers
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and S. nigra. Hybrids with S. petiolaris have been reported (M. L. Fernald 1950) but no convincing specimens have been seen. Salix alba × S. nigra is an
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Betulaceae Betulaceae Betulaceae Betula alleghaniensis Betula papyrifera Betula nigra John Myers John Myers John Myers Casuarinaceae Betulaceae Casuarinaceae Betulaceae
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Cyperaceae Cyperaceae Cyperaceae Cyperaceae Carex rufina Carex eleusinoides Carex nigra Carex aperta Carex haydenii Carex emoryi Carex interrupta Carex torta Carex
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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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