The accepted species of Houstonia in Texas are a diverse lot, ranging from stiffly branched small shrubs of desert mountains to delicate spring annuals of humid pine and hardwood forests.
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Shinners, Lloyd H.
"Transfer Of Texas Species Of Houstonia To Hedyotis (Rubiaceae),"
Field and Laboratory: Vol. 17
Available at: https://scholar.smu.edu/fieldandlab/vol17/iss4/7