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Hypericum Linnaeus. St. John's-wort.

Key to Hypericum

A genus of 370-420 species, trees, shrubs, and herbs, primarily temperate. Hypericum in our area is a large, complex, and interesting genus, with a number of unresolved questions remaining. The species treated in Key B have often been treated in the segregate genus Ascyrum; evidence from a variety of disciplines now suggests that they should be included in Hypericum (Adams & Robson 1961; Calie, Schilling, & Webb 1983; Robson 1996; Nürk et al. 2013). Triadenum is almost basal in (or to) Hypericum, and its inclusion in Hypericum has also been recently promoted (e.g. Nürk et al. 2013), but its retention at generic rank is suggested by its morphological distinction and position as a basal clade.

Key advice:“Longest leaves” should be sought at branch nodes.

Ref: Adams (1957); Adams (1962); Adams (1973); Adams & Robson (1961); Allison (2011); Calie, Schilling, & Webb (1983); Cooperrider (1989); Culwell (1970); Godfrey (1988); Meseguer et al. (2015); Meseguer, Aldasoro, & Sanmartín (2013); Nürk et al. (2013); Robson (1985); Robson (1990); Robson (1996); Robson (2001); Robson (2002); Robson (2006); Robson (2006); Robson (2015a) In Flora of North America Editorial Committee (2015); Robson & Adams (1968); Sorrie (2012); Stevens In Kubitzki, Bayer, & Stevens (2007); Weakley et al. (2011); Webb (1980). Show full citations.

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Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Scott Ward | Original Image ⭷
image of plant© Alan M. Cressler | Hypericum setosum | Original Image ⭷
image of plant© Gary P. Fleming | Hypericum boreale | Original Image ⭷
image of plant© Alan M. Cressler | Hypericum stragulum | Original Image ⭷
image of plant© Gary P. Fleming | Hypericum virgatum | Original Image ⭷
image of plant© Alan Cressler: Hypericum fasciculatum, Sedge Pond, St. Marks National Wildlife Refuge, Wakulla County, Florida 2 by Alan Cressler | Hypericum fasciculatum source | Original Image ⭷
image of plant© Gary P. Fleming | Hypericum setosum | Original Image ⭷
image of plant© Alan Cressler: Hypericum androsaemum, Waiotemarama Loop Trail, Waima Forest Sanctuary, Kaipara, Northland, New Zealand 1 by Alan Cressler | Hypericum androsaemum source | Original Image ⭷

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