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Houstonia Linnaeus. Bluet, Diamond-flower.

Key to Houstonia

The generic limits of Houstonia, Hedyotis, Oldenlandia, and Stenaria have been controversial, with much shuffling of generic configuration. It now appears that Houstonia should be recognized as a genus separate from Hedyotis and Oldenlandia, with Stenaria included in Houstonia (Guo et al. 2013; Wikström et al. 2013; and other references).

ID notes: In the key below, all leaf measurements and length/width ratios for species with mainly stem leaves are based on mid-stem leaves.

Ref: Church (2003); Church & Taylor (2005); Glennon & Church (2015); Guo et al. (2013); Pease & Moore (1907); Rogers (1987); Rogers (2005); Shanks (2015); Terrell (1959); Terrell (1986); Terrell (1991); Terrell (1996); Terrell (2001); Terrell (2007); Turner (1995b); Turner (1997); Ward (2004c); Wikström et al. (2013). 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© Alan Cressler: Houstonia serpyllifolia, Hambidge Center, Rabun County, Georgia by Alan Cressler | Houstonia serpyllifolia source | Original Image ⭷
image of plant© Gary P. Fleming | Houstonia montana | Original Image ⭷
image of plant© Gary P. Fleming | Houstonia purpurea | Original Image ⭷

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