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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Lamiales

Familia: Orobanchaceae
Tribus: Buchnereae
Genus: Graderia
Species: G. fruticosa – G. linearifolia – G. scabra – G. subintegra
Name

Graderia Benth. Prodr. 10: 521. (1846)
Type species: Graderia scabra (L. f.) Benth. Prodr. 10: 521. (1846)

References

Bentham, G. (1846) Prodromus Systematis Naturalis Regni Vegetabilis 10: 521.
The Plant List 2013. Graderia in The Plant List Version 1.1. Published on the internet. Accessed: 2014 Feb. 10.
Tropicos.org 2014. Graderia. Missouri Botanical Garden. Published on the internet. Accessed: 2014 Feb. 10.
International Plant Names Index. 2014. Graderia. Published online. Accessed: Feb. 10 2014.

Graderia[1] is a genus of plants in the family Orobanchaceae, which is native to Africa and Socotra.[2] It belongs to the tribe Buchnereae.[3] It is a hemiparasitic taxon.[4]

Etymology

Graderia is a taxonomic anagram derived from the name of the confamilial genus Gerardia. The latter name is a taxonomic patronym honoring the English botanist John Gerard.[5]
Description
Divergent thecae in G. subintegra

Sometimes a suffrutex with stems growing from a woody rhizome. Leaves may be opposite or alternate.[2] The solitary flowers appear in the axils, and have a five-lobed calyx and corolla. The flower is tubular with four stamens, in pairs of unequal length.[2] Each stamen has two divergent, oblong and curved thecae. The two-locular ovary has numerous ovules, and produces numerous seeds in a fruit capsule.[2]
Systematics

The genus includes some 4 species.[6]

Graderia fruticosa Balf.f. is endemic to Socotra.
Graderia linearifolia Codd
Graderia scabra Benth.
Graderia subintegra Mast.

References

Gardeners Chronicle & New Horticulturist. Haymarket Publishing. 1893.
Hyde, M.A.; et al. "7614.000 Graderia Benth". Flora of Zimbabwe. Retrieved 2 February 2018.
McNeal, J. R.; Bennett, J. R.; Wolfe, A. D.; Mathews, S. (2013-05-01). "Phylogeny and origins of holoparasitism in Orobanchaceae". American Journal of Botany. 100 (5): 971–983. doi:10.3732/ajb.1200448. ISSN 0002-9122. PMID 23608647.
Nickrent, Daniel L. (2020). "Parasitic angiosperms: How often and how many?". Taxon. 69 (1): 5–27. doi:10.1002/tax.12195. ISSN 1996-8175.
Burkhardt, Lotte (2018-06-06). Verzeichnis eponymischer Pflanzennamen - Erweiterte Edition. Index of Eponymic Plant Names - Extended Edition. Index de Noms éponymiques des Plantes - Édition augmentée (in German). Botanic Garden and Botanical Museum Berlin, Freie Universität Berlin. p. G17. doi:10.3372/epolist2018. ISBN 978-3-946292-26-5.
Brown, Gary; Mies, Bruno (2012-05-22). Vegetation Ecology of Socotra. Springer Science & Business Media. ISBN 978-94-007-4141-6.

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