Jens Klackenberg

Calyptranthera is a genus of plants in the family Apocynaceae, first described as a genus in 1996. The entire genus is endemic to Madagascar in the Indian Ocean. Species

Ornichia is a plant genus in the gentian family (Gentianaceae), tribe Exaceae. The genus is endemic to Madagascar.

Camptocarpus semihastatus is a species of plant in the Apocynaceae family. It is native to Madagascar. Jens Klackenberg, the botanist who formally described the species named it after the distinct coronal lobes of its flowers that resemble half the head of a spear (hasta in Latin).

Ischnolepis is a species of plants in the family Apocynaceae first described as a genus in 1909. It contains two species: Ischnolepis graminifolia (Costantin & Gallaud) Klack. – Madagascar Ischnolepis natalensis (Schltr.) Venter – South Africa

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Secamone racemosa is a species of plant in the family Apocynaceae. It is found in Burundi, Cameroon, the Democratic Republic of the Congo, Equatorial Guinea, Rwanda, and Uganda. Its natural habitat is subtropical or tropical moist montane forests. It is threatened by habitat loss.

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Exacum loheri is a species of plant in the family Gentianaceae which is endemic in Rizal, Philippines.

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Baroniella capillacea is a species of plant in the Apocynaceae family. It is endemic to Madagascar. Jens Klackenberg, the botanist who first formally described the species, named it after very narrow or thread-like (capillaceus in Latin) leaves.

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Secamonopsis microphylla is a plant species endemic to southern Madagascar. It is a trailing or erect herb up to 1.5 m tall. Leaves are narrowly oblong, up to 10 mm long. Flowers in groups of 1–3, yellow, tubular, up to 1.2 mm long. The only other species in the genus is Secamonopsis madagascariensis, also indigenous to Madagascar. It is taller, often twining, with larger leaves than S. microphylla.

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Secamone schatzii is a plant species endemic to Madagascar. It grows in lowland rainforest in the eastern part of the country. The species is named in honor of George Schatz of the Missouri Botanical Garden. Secamone schatzii is a liana climbing as high as 20 m (66 ft). Stems are hairless, round in cross-section. Leaves are opposite, unlobed, elliptical, up to 6 cm (2.4 in) long. Flores are borne in short racemes in the axils of the leaves. Corolla is tubular, yellow-orange, up to 1.3 mm (0.051 in) long, hairy in the mouth but smooth and hairless on the lobes, thinning toward the margins.

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