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This species is accepted, and its native range is W. Tanzania to S. Tropical Africa.
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. Pogostemon, R.M. Polhill. Flora of Tropical East Africa. 2009

Type
Type: Mozambique, Unango [Unangu], to Lake Chilwa [Shirwa], W.P. Johnson 15 (K!, holo.)
Morphology General Habit
Aquatic perennial herb.
Vegetative Multiplication Rhizomes
Rhizomes creeping, rooting at the knobbly nodes
Morphology Stem
Stems sometimes purple basally, spongy, terete, hollow, to 60 cm or trailing in water before ascending and up to 1.2 m, producing relatively short flowering branches from upper nodes, with long hairs around the nodes, otherwise glabrous
Morphology Leaves
Leaves in whorls of (3–)5, linear to very narrowly linear-elliptic, 5–20 × 0.5–1.3 cm, but submerged leaves sometimes strap-shaped and up to 30 cm or more long, dentate to subentire under water, tapered to an acute tip, attenuate at base, glabrous except for small hairs on midvein above and longer ones at the base; lateral veins ascending and rather prominent beneath
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, with very many small flowers, 3–10 cm long, congested, columnar, sessile or occasionally interrupted above first verticil, the verticils otherwise scarcely evident but ± 15–20, each with up to 40 flowers; bracts linear to very narrowly linear-elliptic, 2–5 mm long, conspicuously ciliate but almost glabrous on surfaces; bracteoles linear and distinctly smaller
Morphology Reproductive morphology Flowers Calyx
Calyx 1.5–2(–3 in fruit) mm long, with ciliate lobes, shortly pubescent outside and on lobes inside; lobes subequal, ovate-triangular, 0.4–0.7(–1 in fruit) mm long
Morphology Reproductive morphology Flowers Corolla
Corolla white with pink, lilac or mauve lobes, 2.5–3 mm long; tube only slightly exserted from calyx; lobes subequal, elliptic-obovate, the anterior one sometimes rather more triangular, 0.7–1 mm long, ciliate and slightly pubescent
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens exserted, subequal; filaments 3–4 mm long, conspicuously hairy at the middle; anthers 0.2–0.3 mm long
Morphology Reproductive morphology Flowers Gynoecium Style
Style 4.5–5 mm long
Morphology Reproductive morphology Fruits
Nutlets dark glossy brown, ovoid-ellipsoid, 0.7–0.9 × 0.6–0.7 mm
Figures
Fig 6, p 31
Ecology
Streams; 1700 m
Conservation
Collected only once in East Africa, but quite widely distributed in neighbouring countries and probably not threatened.
Distribution
Range: Zambia, Malawi, Mozambique Flora districts: T4

Native to:

Malawi, Mozambique, Tanzania, Zambia

Pogostemon aquaticus (C.H.Wright) Press appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2004 Johnson. W. [15], Mozambique K000193098 Unknown type material

First published in Bull. Brit. Mus. (Nat. Hist.), Bot. 10: 73 (1982)

Accepted by

  • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • 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.
  • Paton, A.J., Bramley, G., Ryding, O., Polhill, R.M., Harvey, Y.B., Iwarsson, M., Otieno, D., Balkwill, K., Phillipson, P.B., Harley, R.M. & Willis, F. (2013). Flora Zambesiaca 8(8): 1-346. Royal Botanic Gardens, Kew.

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

  • Bull. Br. Mus. (Nat. Hist.) 10: 73 (1982)
  • Bull. Nat. Hist. Mus. Lond., Bot. 27: 118, fig. 13j; 40 (1997).

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