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Stachys Linnaeus. Hedge-nettle.

Contributed by John B. Nelson, Gary P. Fleming, and Derick B. Poindexter

Key to Stachys

A genus of about 300 species, herbs and shrubs, mainly temperate, nearly cosmopolitan (except Australia and New Zealand).

ID notes:Stachys is a technically “difficult” genus with species often separated by fairly subtle morphological characters. The genus is in need of modern molecular systematic work to clarify phylogenetic relationships. As now circumscribed, it presents numerous challenges in identification using morphological characters because many species exhibit pronounced variation in leaf blade size or shape, petiole length, and pubescence. As a rule, plants growing in open habitats (sun forms) are stricter, narrower-leaved, shorter-petioled, and/or more pubescent than plants of the same species growing in shade (shade forms). In addition, the shape and length of calyx lobes, which are critical in distinguishing among species, change to some extent during the growing season. Therefore it is essential to obtain material in fruiting or at least late flowering condition for the most reliable assessment of these characters."

Ref: Fleming, Nelson, & Townsend (2011); Floden (2016); Harley et al. In Kadereit (2004); Keener & Davenport (2016); Mulligan & Munro (1989); Nelson (1981); Nelson (2008); Nelson & Fairey (1979); Nelson & Rayner (2014); Poindexter & Nelson (2011); Pringle (2002). 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© Gary P. Fleming | Stachys aspera | Original Image ⭷
image of plant© Gary P. Fleming | Stachys arenicola | Original Image ⭷
image of plant© Gary P. Fleming | Stachys arvensis | Original Image ⭷
image of plant© Gary P. Fleming | Stachys byzantina | Original Image ⭷
image of plant© Gary P. Fleming | Stachys subcordata | Original Image ⭷
image of plant© Gary P. Fleming | Stachys matthewsii | Original Image ⭷
image of plant© Gary P. Fleming | Stachys subcordata | Original Image ⭷

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