| 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 even though only eight counties have records, the State Rank is clearly S2 and not S1. 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 | S1 [S2] | |
| Global Rank | G5 | |
| State Status | SC-V | |
| US Status | | |
| USACE-agcp | FAC link |
| USACE-emp | FAC link |
