Vascular Plants of North Carolina
Account for Large Black-snakeroot + - Sanicula canadensis var. grandis   Fernald
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Section 6 » Family Apiaceae
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AuthorFernald
DistributionWeakley (2022) considers this taxon as uncommon in the Mountains and rare in the Piedmont. One website editor, Sorrie, recently reviewed specimens at the UNC-Chapel Hill herbarium. His tentative identifications, based on Fernald's 1940 paper in Rhodora, show that var. grandis occurs in Alleghany, Ashe, Avery, Haywood, Henderson, Madison, Mitchell, and Watauga counties--all montane. A specimen from Forsyth County is equivocal.

Ranges from IA to southern ONT and VT, south to OK, reportedly TX, AR, northeast AL, possibly north GA (equivocal), and northwest SC (Greenwood Co.).
AbundanceSeems to be widespread in the Mountains; very rare eastwards. No data on population sizes.
HabitatMesic to Basic hardwood and hardwood-conifer forests.
PhenologyFlowering May-June; fruits June-Aug.
IdentificationAccording to measurements taken from NCU specimens, var. grandis leaflet length ranges from 5.5-13 cm long and 2.5-6 (-8) cm broad. The means are 8.5 cm and 3.5 cm, respectively. These measurement are from large leaflets of petioled leaves. The width of the mature fruiting triad ranges from 0.8-1.2 cm; mean 1.0. The Montgomery County plants ranged up to 3 feet tall.
Taxonomic CommentsThis variety was described by Fernald (1940) in Rhodora 42: 467.

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B.A. SorrieSame plant, same data. MontgomeryPhoto_natural
B.A. SorrieRoadside in rich mesic slope, Uwharrie NF, 23 May 2025. MontgomeryPhoto_natural
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