Copy permalink to share
Rubiaceae
Houstonia

not marked as a favorite taxon Houstonia Linnaeus. Common name: 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).

Glossary (beta!)

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.

References: 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.

Show in key(s)

Show parent family | Show parent in key(s)

Show species in Houstonia

Your browser does not support SVGs

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 #1 of Houstonia© Alan Cressler: Houstonia serpyllifolia, Hambidge Center, Rabun County, Georgia by Alan Cressler | Houstonia serpyllifolia source | Original Image ⭷
image #2 of Houstonia© Gary P. Fleming | Houstonia montana | Original Image ⭷
image #3 of Houstonia© Richard & Teresa Ware | Houstonia serpyllifolia CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #4 of Houstonia© Gary P. Fleming | Houstonia purpurea | Original Image ⭷

Feedback

See something missing or incorrect about Houstonia? Let us know here:
  1. Please include your name and if possible, email in case when need to clarify what you wrote.
  2. If you opt out of including email, please be as specific as possible (e.g., which photo is incorrect?)
  3. Please do not submit questions asking to identify plants or about horticultural topics (e.g., how do I control an invasive plant in my garden?). Instead, those questions can be submitted here for the Carolinas region only.
  4. Please do not send us feedback about unkeyed species as this work is ongoing.
  5. Please allow time for flora edits to show in our next data release. We greatly appreciate your feedback but may require extra time to research complicated taxonomic issues.