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- Catophractes alexandri, the only species in the genus Catophractes, is a spiny shrub or small tree up to 3m tall, belonging to the family Bignoniaceae and occurring in the hot, low-rainfall regions of Namibia, the Northern Cape, Kalahari Desert, Botswana, western Zimbabwe and Limpopo. Preferring calcrete, limestone outcrops and soils, the species often forms pure communities, or grows in association with Colophospermum mopane, , Phaeoptilum spinosum and . It is parasitised by several Tapinanthus spp. The specific name honours James Edward Alexander, the Victorian soldier and explorer, while the generic name refers to leaves and flowers arising from below the paired, decussate, opposite spines. Leaves are tufted (fascicled) or opposite, and densely tomentose and grey. They are simple and elliptic to obovate, up to 4 cm long, and with coarsely dentate or scalloped margins. The white or pink flowers, produced after rain, are about 10 cm in length, fragrant, showy or specious, 5-lobed, and with a yellow throat. Inside the tube there is a broad, villous band below the origin of the filaments. The calyx is tubular with linear teeth, and slit on one side. The fruit is a flattened, woody capsule, some 10 cm long, warty and splitting or dehiscing across the flat faces into two equal parts. Old fruits are pendant and produce a characteristic clicking sound in light breezes, caused by the castanet-like tapping of the two hollow parts. Seeds are papery and winged. Descriptions of this species appeared in "Ann. Nat. Hist." ii. (1839) 375;—"Proc. Linn. Soc." i. (1839) 4; "Trans. Linn. Soc." xviii. (1841) 307, t. 22; "DC. Prodr." ix. 233; Kuntze in "Jahrb. Bot. Gart. Berl." iv. (1886) 270; Engl. in "Engl. Jahrb." x. 255; K. Schum. in "Engl. & Prantl, Pflanzenf." iv. 3B, 233. (en)
- Catophractes D.Don es un género monotípico de árboles pertenecientes a la familia Bignoniaceae. Su única especie, Catophractes alexandri, es originaria de Sudáfrica en el Kalahari. (es)
- Catophractes est un genre de plantes de la famille des Bignoniaceae. (fr)
- Catophractes é um género botânico pertencente à família Bignoniaceae, encontrado nas regiões tropicais da África. (pt)
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- Catophractes D.Don es un género monotípico de árboles pertenecientes a la familia Bignoniaceae. Su única especie, Catophractes alexandri, es originaria de Sudáfrica en el Kalahari. (es)
- Catophractes est un genre de plantes de la famille des Bignoniaceae. (fr)
- Catophractes é um género botânico pertencente à família Bignoniaceae, encontrado nas regiões tropicais da África. (pt)
- Catophractes alexandri, the only species in the genus Catophractes, is a spiny shrub or small tree up to 3m tall, belonging to the family Bignoniaceae and occurring in the hot, low-rainfall regions of Namibia, the Northern Cape, Kalahari Desert, Botswana, western Zimbabwe and Limpopo. Preferring calcrete, limestone outcrops and soils, the species often forms pure communities, or grows in association with Colophospermum mopane, , Phaeoptilum spinosum and . It is parasitised by several Tapinanthus spp. (en)
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