Abstract
Two new species are described:Houstonia butterwickiae from Texas andH. teretifolia from Mexico, and two new combinations are made:H. acerosa subsp.polypremoides andH. mullerae.
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Terrell, E. E. 1975. Relationships ofHedyotis fruticosa L. toHoustonia L. andOldenlandia L. Phytologia 31: 418–424.
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Terrell, E.E. New species and combinations in Houstonia (Rubiaceae). Brittonia 31, 164–169 (1979). https://doi.org/10.2307/2806692
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DOI: https://doi.org/10.2307/2806692