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This species is accepted, and its native range is W. Tropical Africa to South Sudan and Tanzania.
A specimen from Kew's Herbarium

[FWTA]

Labiatae, J. K. Morton. Flora of West Tropical Africa 2. 1963

Morphology General Habit
A slender fast-growing often bushy annual herb up to 4 ft. high
Ecology
In marshy savanna.

[FTEA]

Lamiaceae (Labiatae), A.J. Paton, G. Bramley, O. Ryding, R.M. Polhill, Y.B. Harvey, M. Iwarsson, F. Willis, P.B. Phillipson, K. Balkwill, C.W. Lukhoba, D.F. Otieno, & R.M. Harley. Pycnostachys, G Bramleyshaped. Flora of Tropical East Africa. 2009

Type
Type: Sudan, Equatoria, Dokuto [Dukuttu], Schweinfurth 2770 (B†, holo. K!, iso., Z, scanned image of iso.!)
Morphology General Habit
Annual herb to 1 m tall, becoming woody below
Morphology Stem
Stems erect, quadrangular, pubescent with very short downward-pointing or patent eglandular hairs, also with red sessile glands
Morphology Leaves
Leaves opposite, sessile, often with new leafy shoots arising from the axils; blades ± linear, 3–8 × 0.3–0.6 cm, delicate, with small widely spaced serrations, apex acute, base sessile, attenuate to stem, pubescent with short stiff appressed hairs, these more plentiful on the lower surface and venation, also with deeply set red sessile glands
Morphology Reproductive morphology Inflorescences
Inflorescence dense, shortly conical in flower, in fruit 35–60 × 18–20 mm; bracts subtending entire inflorescence linear, 7–20 mm long, acute, pubescent with short stiff eglandular hairs, with deeply set red sessile glands, deflexed, persistent through flowering stage; bracts subtending single flowers ± linear, 3–4 mm long, pubescent and ciliate
Morphology Reproductive morphology Flowers Calyx
Calyx pubescent with eglandular hairs on the outer surface of the tube, also with yellow sessile glands, tube ± 1 mm long at anthesis, with 0.5 mm long triangular scales present on the inner surface of the tube between calyx lobes, these pubescent with short eglandular hairs; lobes 5, subulate, ± 3 mm long, with eglandular hairs and sometimes shorter glandular hairs; fruiting calyx with tube 4–5 mm long, funnel-shaped, lobes ± erect, 4–6 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla blue, 9–12 mm long, pubescent with eglandular hairs and with yellow sessile glands; tube very narrow and parallel-sided for ± 4 mm, then curving sharply downwards and broadening for 2–3 mm before opening into two lips; posterior lip nearly as long as anterior 3–4 mm long; anterior lip 5–5.5 mm long, ± 2 mm deep
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens connate for ± 1 mm, remaining ± enclosed within the lip
Morphology Reproductive morphology Fruits
Nutlets 1.5–2 mm long.
Ecology
Wet grassland; 1100–1500 m
Conservation
Least concern: widely distributed, though not collected very frequently
Note
Pycnostachys schweinfurthii has been rarely collected in Tanzania, apparently having a more western distribution extending to Ghana. It is probably most similar to P. stuhlmannii, but the two species are unlikely to be confused since P. schweinfurthii has a different distribution and lacks the distinctive venation and perennial habit of P. stuhlmannii.
Distribution
Range: Ghana, Sudan, possibly Congo-Kinshasa Flora districts: T1 T4 T7

Native to:

Chad, Ghana, Senegal, Sudan, Tanzania, Togo

Coleus togoensis (Perkins) A.J.Paton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Baumann [404], Ghana Pycnostachys schweinfurthii K000405729 Unknown type material
Schweinfurth [2770], Sudan Pycnostachys schweinfurthii K000405961 Unknown type material
Schweinfurth [2770], Sudan Pycnostachys schweinfurthii K000405962 Unknown type material
Bidgood, S. [5988], Tanzania Pycnostachys schweinfurthii K000468437

First published in PhytoKeys 129: 105 (2019)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Kew Backbone Distributions

  • Berhaut, J. (1975). Flore illustrée du Sénégal 4: 1-625. Gouvernement du Sénégal, Ministère du développement rural direction des eaux et forêta, Dakar.
  • Brunel, J.F., Hiepo, P. & Scholz, H. (eds.) (1984). Flore Analytique du Togo Phanérogames: 1-751. GTZ, Eschborn.
  • Lebrun, J.-P., Audru, J., Gaston, A. & Mosnier, M. (1972). Catalogue des Plantes Vasculaires du Tchad Méridional: 1-289. Institut d' Elevage et de Médecine Vétérinaire des Pays Tropicaux, Maisons Alfort.
  • Paton, A.J., Bramley, G., Ryding, O., Polhill, R., Harvey, Y., Iwarsson, M., Willis, F., Phillipson, P., Balkwill, K., Lukhoba, C., Otiend, D & Harley (2009). Lamiaceae (Labiatae) Flora of Tropical East Africa: 1-430.

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of West Tropical Africa
Flora of West Tropical Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0