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

[FTEA]

Acanthaceae (part 2), Kaj Vollesen. Flora of Tropical East Africa. 2008

Type
Type: Tanzania, Iringa District: Ruaha National Park, Mwagusi River, Congdon 526 (K!, holo.; BR!, C!, CAS!, DSM!, EA!, K!, MO!, NHT!, P!, UPS!, iso.)
Morphology General Habit
Erect shrubby herb or shrub to 2 m tall; stems quadrangular, straw-coloured, when young glabrous to puberulous or pubescent or glandular-puberulous
Morphology Leaves
Leaves with basal part of petiole forming a short stipule-like sheath around stem; lamina ovate to broadly ovate, largest 6–14 × 3–8.5 cm, apex acute to acuminate, base decurrent almost to stem, glabrous or with scattered broad glossy hairs along veins and sometimes also on lamina
Morphology Reproductive morphology Flowers
Flowers in axillary dichasia which sometimes merge into more or less distinct paniculate cymes, dichasia glandular-puberulous or densely so; peduncles up to 18 cm long; branches up to 2.5(–3.5) cm long; pedicels up to 3 mm long; bracts and bracteoles elliptic to obovate, up to 15(–25) × 3(–8) mm
Morphology Reproductive morphology Flowers Calyx
Calyx (15–)20–37 mm long of which the fused basal part 2–7 mm, densely glandularpuberulous with pale yellow stalked capitate glands; lobes linear to narrowly spathulate, dorsal (13–)20–30 × 2–4 mm, ventral and lateral (10–)12–25 × 1–1.5 mm
Morphology Reproductive morphology Flowers Corolla
Corolla white to pale mauve with orange-brown pleated throat, sparsely glandularpuberulous outside, 25–34 mm long of which cylindric tube 7–10 mm, throat 6–8 mm and lips 8–18 mm; lobes in upper lip 5–7 mm long, ovate, in lower lip 6–11 mm long, narrowly ovate-oblong
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Free part of filaments hairy at base or almost to apex (densest downwards), fused for 2–4 mm basally, short 8–10 mm and long 12–14 mm; anthers 4.5–5.5 mm long, all thecae with spurs 0.5–1 mm long, apiculate at apex
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma ± 0.5 mm long
Morphology Reproductive morphology Fruits
Capsule 2-seeded, obovoid, 12–15 mm long, pale to dark brown, glossy, retained on plant
Morphology Reproductive morphology Seeds
Seed ± 5 × 4 mm
Ecology
Grassland on black cotton soil, alluvial Acacia grassland and thicket, degraded Itigi thicket, riverine scrub; 750–1400 m
Note
Mellera congdonii differs conspicuously from all other species in the genus by its obovoid 2-seeded capsule which is retained unopened on the plant until the following rainy season. All other species have narrowly ellipsoid capsules with more than 4 seeds. All other species are basically from forest or wetter types of woodland and I consider this to be an adaptation to a dry country environment. Similar retention of the fruits are seen in other dry country Acanthaceae, e.g. Blepharis, Duosperma and Dyschoriste.
Distribution
Range: Not known elsewhere Flora districts: T5 T7

Native to:

Tanzania

Mellera congdonii Vollesen appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2007 Congdon, T.C.E. [526], Tanzania K000780521 isotype
Jan 1, 2007 Congdon, T.C.E. [526], Tanzania K000780520 holotype
Bidgood, S. [6153], Tanzania K000468272
Congdon, T.C.E. [526], Tanzania K000780519 isotype

First published in Fl. Trop. E. Africa, Acanth.(1): 238 (2008)

Accepted by

  • Vollesen, K. (2008). Flora of Tropical East Africa, Acanthaceae(1): 1-285.

Literature

Kew Backbone Distributions

  • Vollesen, K. (2008). Flora of Tropical East Africa, Acanthaceae(1): 1-285.

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