| Section 6 » Order Asterales » Family Asteraceae |
Show/Hide Synonym
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| Silphium perfoliatum | = | Silphium perfoliatum var. perfoliatum | Gleason and Cronquist (1991) | | | Silphium perfoliatum | = | Silphium perfoliatum var. perfoliatum | Flora of North America (1993b, 1997, 2000, 2002a, 2002b, 2003a, 2004b, 2005, 2006a, 2006b, 2006c, 2007a, 2009, 2010) | | | Silphium perfoliatum | = | Silphium perfoliatum var. perfoliatum | | | | Silphium perfoliatum | = | Silphium perfoliatum var. perfoliatum | | | | Silphium perfoliatum | = | Silphium perfoliatum var. perfoliatum | | | | Silphium perfoliatum | = | Silphium perfoliatum var. perfoliatum | Vascular Flora of the Southeastern States (Cronquist 1980, Isely 1990) | | | Silphium perfoliatum | = | Silphium perfoliatum var. perfoliatum | Flora of Virginia | | | Silphium perfoliatum | < | Silphium perfoliatum | Gleason (1952) | | | Silphium perfoliatum | < | Silphium perfoliatum | Wofford (1989) | | | Source: Weakley's Flora |
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| Author | L. | |
| Distribution | Middle and upper Piedmont and northern Mountains, south only to Ashe and Alleghany counties in the Mountains.
VT to Ont. and ND, south to NC, AL, and TX. | |
| Abundance | Rare to locally uncommon, though a few sites have populations of several dozen individuals. The NCNHP database has 30 records, and it now has a State Rank of S2. This is a State Special Concern species. | |
| Habitat | Floodplain forests, bottomlands, and openings in same. Typically in openings and edges of alluvial woods and wet thickets, such as along sewerline clearings, and not usually found in pristine habitats. | |
| Phenology | Flowering and fruiting June-August. | |
| Identification | This and S. connatum are spectacular and striking species, often reaching 6-9 feet tall, with oddly square (quadrangular) stems in cross-section and numerous fairly large sunflower-like flowers. They differ from other rosinweeds by their paired leaves that are fused basally around the stem (connate). Common Cup-plant has glabrate stems (vs. spreading coarse hairs) and 21-34 ray florets (vs. 8-13 ray florets). If in doubt between these two species, rub the stem; if smooth it is this species but if scabrous, it is S. connatum. Sometimes you can find rainwater forming as pools at the cup-like bases of the leaves of both species. | |
| Taxonomic Comments | Most authors treat Virginia Cup-plant and Common Cup-plant as varieties of S. perfoliatum.
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| Other Common Name(s) | Usually just called Cup-plant, but that covers both this taxon and S. connatum combined. Each needs a modifier name, and Weakley (2018) uses Common Cup-plant for this species. | |
| State Rank | S2 | |
| Global Rank | G5 | |
| State Status | SC-V | |
| US Status | | |
| USACE-agcp | FAC link |
| USACE-emp | FAC link |
