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This species is accepted, and its native range is Uganda to Malawi.
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: Rwanda, between Kirinda and Lubengera, Robyns 2449 (BR!, holo.)
Morphology General Habit
Annual herb, 0.3–1.2 m tall
Morphology Stem
Stems erect, quadrangular, pubescent with short eglandular downward-pointing hairs and red sessile glands
Morphology Leaves
Leaves opposite, petiolate blades narrowly ovate, 2–6 × 0.9–3 cm, crenate or crenate-serrate, apex shortly acuminate, base attenuate, narrowing gradually forming a wing down the petiole, pubescent with short stiff eglandular hairs above and on the venation beneath, also with red sessile glands beneath petiole, narrowly winged by lamina, 5–20 mm long
Morphology Reproductive morphology Inflorescences
Inflorescence dense, when in flower forming a narrow conical shape, in fruit, expanding to 25–40 × 15–18 mm bracts subtending entire inflorescence narrowly ovate to lanceolate, 5–20 mm long, acute, enclosing buds then becoming deflexed in flower, pubescent with short eglandular hairs, persistent through flowering stage bracts subtending single flowers lanceolate to narrow oblanceolate, 3–4 mm long, ciliate
Morphology Reproductive morphology Flowers Calyx
Calyx with tube ± 1 mm long at anthesis, outer surface with eglandular hairs and scattered red sessile glands, inner surface with ± 0.3 mm long rounded-triangular scales present between calyx lobes, these ciliate with eglandular hairs lobes 5, subulate, 2–2.5 mm long, pubescent with glandular hairs fruiting calyx tube 3–3.5 mm long, the dorsal side curving over to form a hood over the mouth, somewhat ventrally gibbous, the lobes arranged so that one upper, two lateral and two lower lobes are distinguishable, the upper and lateral lobes with a slight downward curve, the lower lobes curving upwards, ± 2.5 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla pale blue to pale purple, 4–5 mm long tube very narrow and parallel-sided for ± 1 mm, then curving sharply downwards and broadening for ± 2 mm before opening out into two lips, with scattered short eglandular hairs posterior lip ± 1 mm long, backs of lobes with long eglandular hairs anterior lip 1–2 mm long, 0.5–1 mm deep, with long eglandular hairs on the front of lip
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens connate for ± 0.5 mm, barely exserted for ± 1 mm
Morphology Reproductive morphology Fruits
Nutlets ± 1 mm long.
Ecology
Montane grassland and volcanic plains or rock outcrops, on yellowish brown gravelly soil or loose black volcanic soil; 1600–2350 m
Conservation
Least Concern: quite widely distributed in several countries
Note
Pycnostachys ruandensis is easily recognisable due to its hooded calyx and small corolla. It has a wide distribution, at a relatively high altitude. It tends to be more robust in terms of the inflorescence and with a slightly bigger calyx in the southernmost part of its distribution, in Malawi. Superficially, it could be confused with P. verticillata, but this is a much smaller plant, with a smaller inflorescence and smaller leaves that are often folded.
Distribution
Range: Congo-Kinshasa, Rwanda, Burundi and Malawi Flora districts: U2 T4 T7 T8

Native to:

Burundi, Malawi, Rwanda, Tanzania, Uganda, Zaïre

Coleus ruandensis (De Wild.) A.J.Paton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2011 Gereau, R.E. et al [7241], Tanzania Pycnostachys ruandensis K000735336
Jan 1, 2011 Gereau, R.E. et al [7212], Tanzania Pycnostachys ruandensis K000735337
Jan 1, 2009 Magogo [2210], Tanzania Pycnostachys ruandensis K000248685
Jan 1, 2009 Macha [268], Tanzania Pycnostachys ruandensis K000248686
Jan 1, 2009 Macha [268], Tanzania Pycnostachys ruandensis K000248687
Oct 1, 2004 Milne-Redhead, E. [10370], Tanzania Pycnostachys ruandensis 27438.000
Oct 1, 2004 Brummitt, R.K. [11591a], Malawi Pycnostachys ruandensis 33083.000
Milne-Redhead, E. [10200], Tanzania Pycnostachys ruandensis 27441.000
Robyns, W. [2449], Rwanda Pycnostachys ruandensis K000405731 Unknown type material
Schlieben [1053], Tanzania Pycnostachys ruandensis K000405968

First published in PhytoKeys 129: 90 (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