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Justicia Linnaeus. Water-willow.

Key to Justicia

A genus of 600 or more species, herbs and shrubs of the tropics and warm temperate North America. Justicia as circumscribed is highly polyphyletic and will need to be expanded further or split into smaller, monophyletic units. Any splitting will remove Justicia from our native flora, as the type of Justicia is Old World, and all the New World taxa form a separate clade.

Ref: Daniel (2013); Long (1970); Wasshausen (1998). 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© Bruce A. Sorrie | Justicia americana | Original Image ⭷
image of plant© Brady Reed, some rights reserved (CC BY), uploaded by Brady Reed | Justicia lanceolata source | Original Image ⭷
image of plant© Alan Cressler: Justicia pilosella, South Llano State Park, Kimble County, Texas 1 by Alan Cressler | Justicia pilosella source | Original Image ⭷
image of plant© Alan Cressler: Justicia americana, New River, Sandstone Falls, New River Gorge National River, Raleigh and Summers Counties, West Virginia 1 by Alan Cressler | Justicia americana source | Original Image ⭷

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See something wrong or missing on about Justicia? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.) We greatly appreciate feedback, and will include updates from you in our next webapp update, which can take a few months.