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This genus is accepted, and its native range is Central & E. Tropical Africa.
A specimen from Kew's Herbarium

[LKGF]

Harley, R.M. et al. (2004). Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Springer-Verlag, Berlin, Heidelberg, New York.

Morphology General Habit
Shrubs or herbs, not aromatic
Morphology Leaves
Leaves simple
Morphology Reproductive morphology Inflorescences
Inflorescence thyrsoid with cymes sessile, 2-7-flowered
Morphology Reproductive morphology Inflorescences Bracts
Bracts persistent, leaf-like but smaller, sometimes with a conspicuous abaxial glandular structure
Morphology Reproductive morphology Flowers Calyx
Calyx cylindrical or constricted at throat distally, becoming inflated, membranous, truncate at base, 2-lipped, 3-lobed (1/2), lobes unequal, posterior rounded, smaller than anterior, not decurrent Lateral lobes absent, anterior lobes large, rounded, throat closed by converging lobes, fruiting calyx shed as a unit
Morphology Reproductive morphology Flowers Corolla
Corolla strongly 2-lipped, 5-lobed (4/1), white to purple, posterior lip reflexed, 4-lobed with median lobes exceeding lateral lobes, anterior lip horizontal, cucullate, corolla-tube basally geniculate and with small spur, parallel-sided distally, glabrou
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 4, held within anterior corolla lip, fused or free at base
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma lobes linear
Morphology Reproductive morphology Flowers Disc
Disc 4-lobed with anterior lobe larger
Morphology Reproductive morphology Fruits
Nutlets ovoid, glabrous, slightly flattened, weakly mucilaginous
Ecology
In open woodland or in rocky or damp grassland.
Distribution
Native to: West-Central Tropical Africa, East Tropical Africa, South Tropical Africa

[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. Flora of Tropical East Africa. 2009

Morphology General Habit
Shrubs or herbs, not aromatic.
Morphology Stem
Stems branched
Morphology Leaves
Leaves simple
Morphology Reproductive morphology Inflorescences
Inflorescence thyrsoid with sessile, 2–7-flowered cymes; bracts persistent, leaf-like but smaller, sometimes with a conspicuous abaxial gall or gland-like structure
Morphology Reproductive morphology Flowers Calyx
Calyx cylindrical or constricted at throat distally, becoming inflated, membranous, truncate at base, 2lipped, 3-lobed (1 posterior, 2 anterior), lobes unequal, posterior rounded, smaller than anterior, not decurrent; lateral lobes absent, anterior lobes large, rounded, throat closed by converging lobes; fruiting calyx inflated, shed as a unit
Morphology Reproductive morphology Flowers Corolla
Corolla white to purple, strongly 2-lipped, 5-lobed (4 posterior, 1 anterior); tube basally geniculate and dorsally spurred, parallel-sided distally, glabrous within but with a basal annulate ridge formed from the posterior staminal filament traces; posterior lip reflexed, 4-lobed with median lobes exceeding lateral lobes; anterior lip horizontal, cucullate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 4, held within anterior corolla lip, attached to corolla at throat, fused or free for a very short distance at base; anthers dorsifixed, synthecous
Morphology Reproductive morphology Flowers Disc
Disk 4-lobed with anterior lobe larger
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary deeply 4-lobed; style gynobasic bifid; lobes linear
Morphology Reproductive morphology Fruits
Nutlets ovoid, glabrous, slightly flattened, weakly mucilaginous

Native to:

Angola, Burundi, Congo, Tanzania, Zambia, Zaïre

Alvesia Welw. appears in other Kew resources:

First published in Trans. Linn. Soc. London 27: 55 (1869)

Accepted by

  • Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 1-529. MIM, Deurne.
  • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.

Literature

Flora of Tropical East Africa

  • K.B. 26: 564–565 (1972)
  • Kubitzki, Fam. Gen. Vasc. Pl. 7: 267 (2004)
  • Molec. Phylog. Evol. 31: 277–299 (2004)
  • Trans. Linn. Soc., Bot. 27: 55 (1869), nom. conserv.

Lamiaceae Key Genus Fact Sheets

  • Alvesia Welw., Trans. Linn. Soc. 27: 55 (1869) nom. conserv.
  • Harley RM, Atkins S, Budantsev AL, Cantino PD, Conn BJ, Grayer R, Harley MM, de Kok RPJ, Krestovskaja T, Morales R, Paton AJ, Ryding O, and Upson T. 2004. Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Sp
  • Matthew, Kew Bull. 25: 407-411, rev.
  • Matthew, Kew Bull. 26: 564-565 (1972).
  • Plectranthastrum T.C.E.Fr., Repert. Spec. Nov. Regni Veg. 19: 298 (1924).

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

Lamiaceae Key Genus Fact Sheets
Nina Davies, Gemma Bramley and Don Kirkup, Royal Botanic Gardens, Kew
http://creativecommons.org/licenses/by/3.0