Sp. Pl.1: 151. 1753
Gen. Pl. ed.5, 75. 1754
Tropical and subtropical regions, North America, Central America, South America, Europe, Asia, Africa.
species 12 (2 in the flora)
Several species of Plumbago are cultivated, including P. auriculata. The entire plant of that species, especially the root, contains plumbagin, a toxic naphthoquinone derivative (oil of plumbago), which may cause severe skin irritation or blistering in humans and may also be toxic to other animals (T. C. Fuller and E. McClintock 1986).
The remarkable glands on the calyces of Plumbago are often called “glandular hairs,” but they are not true hairs, being much more massive and multicellular structures with enlarged, capitate apices.
|1||Corollas pale blue, tube 2 or more times length of calyx; calyces with stipitate, glandlike protuberances and hairs; inflorescences compact, 2.5-3(-5) cm; plants cultivated and locally naturalized in Florida||Plumbago auriculata|
|1||Corollas white, tube mostly less than 2 times length of calyx; calyces with stipitate, glandlike protuberances, true hairs absent; inflorescences elongate, 3-15(-30) cm; plants native||Plumbago zeylanica|