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This species is accepted, and its native range is Tanzania to Zambia.
A specimen from Kew's Herbarium

[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: Congo-Kinshasa, Katanga, West Kundelungu, Kassner 2794 (BR, holo., BM!, K!, iso.)
Morphology General Habit
Annual herb, 0.4–1 m tall
Morphology Stem
Stems erect, quadrangular, pubescent with short, downward-pointing eglandular hairs and red sessile glands, these more plentiful on younger growth; indumentum immediately below inflorescence with eglandular and glandular hairs
Morphology Leaves
Leaves opposite, sessile; blades linear to narrowly elliptic, 3.5–12.5 × 0.4–2 cm, margins with small widely spaced serrations, apex acuminate, narrowed to a cuneate base, with yellow and red sessile glands and pubescent with short eglandular hairs, the hairs more plentiful on the venation beneath
Morphology Reproductive morphology Inflorescences
Inflorescence dense, when in flower forming a short conical shape, in fruit 30–35 × 18–20 mm; bracts subtending entire inflorescence in a whorl of 4, narrowly ovate, 20–50 mm long, acuminate to long-acuminate, enclosing buds then becoming deflexed in flower, pubescent and ciliate with short eglandular hairs, persistent through flowering stage; bracts subtending single flowers ± linear, ± 3 mm long,inconspicuous
Morphology Reproductive morphology Flowers Calyx
Calyx with tube ± 1 mm long at anthesis, outer surface with short glandular hairs and yellow and red sessile glands, inner surface with 0.5 mm long rounded-triangular scales present between calyx lobes, these ciliate; lobes 5, subulate, 1.5–2 mm long, with short glandular hairs and occasionally longer eglandular hairs; fruiting calyx with tube 2–4 mm, somewhat ventrally gibbous, not compressed at the mouth, lobes 5, subulate, erect, lengthening to 5–7 mm
Morphology Reproductive morphology Flowers Corolla
Corolla white or pale blue to lilac, 15–16 mm long; tube with short eglandular hairs, very narrow and parallel-sided for ± 6 mm, then curving sharply downwards and broadening for 4 mm before opening into two lips; posterior lip shorter than anterior, ± 2 mm long, with glandular hairs and red sessile glands; anterior lip ± 6 mm long, ± 4 mm deep, with eglandular hairs and red sessile glands on the front of the lip
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens connate for ± 2 mm, exserted for 1–1.5 mm
Morphology Reproductive morphology Fruits
Nutlets 1–1.5 mm long.
Ecology
Brachystegia woodland, along streams, grazed grassland on sandy sandy soils; 950–1800 m
Conservation
Least concern: quite widely distributed in several countries
Note
Pycnostachys congensis Gürke, a species described from Congo-Kinshasa, appears to differ only by its shorter calyx lobes. More detailed study, and better collections of Congolese material is required to clarify specific limits. Pycnostachys kassneri is a commonly collected herb, recognisable due to its narrow leaves and a corolla with a long narrow tube and deeply boat-shaped anterior lip. In Zambia there is a slightly different form present that differs due to the presence of eglandular hairs on the calyx lobes (e.g. Richards 9187; Drummond & Rutherford-Smith 7265). In all other respects they are conspecific with the other specimens, so are not recognisable as a distinct taxon.
Distribution
Range: Congo-Kinshasa and Zambia Flora districts: T2 T4 T7 T8

Native to:

Tanzania, Zambia, Zaïre

Coleus scruposus A.J.Paton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2009 Leysen [132], Tanzania Pycnostachys kassneri K000248688
Jan 1, 2009 Leysen [125], Tanzania Pycnostachys kassneri K000248689
Sep 1, 2007 Mwangulango, N. [1133], Tanzania Pycnostachys kassneri K000248148
Feb 1, 1939 Kassner, T. [2794], Congo, DRC Pycnostachys kassneri K000405732 Unknown type material
Kassner, T. [2794], Congo, DRC Pycnostachys kassneri K000405733
Kassner, T. [2967], Congo, DRC Pycnostachys kassneri K000405736 Unknown type material
Kassner, T. [2967], Congo, DRC Pycnostachys kassneri K000405735

First published in PhytoKeys 129: 92 (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

  • 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

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