Skip to main content
This species is accepted, and its native range is E. Angola to SW. Zambia.
A specimen from Kew's Herbarium

[FZ]

Flora Zambesiaca Acanthaceae (part 2) by Iain Darbyshire, Kaj Vollesen and Ensermu Kelbessa

Morphology General Habit
Suffruticose perennial 20–40 cm tall with numerous erect stems from a woody rootstock; stems with dense buff to golden dendritic hairs, many with a long antrorse arm, ± persistent.
Morphology Leaves
Leaves narrowly elliptic or somewhat obovate, 5–9 × 2–3 cm, base cuneate, apex acute, subattenuate or obtuse, upper surface with numerous pale long-armed stellate hairs, eventually glabrescent, lower surface with ± dense pale-buff stellate hairs and buff to golden long-armed dendritic hairs on principal veins and margins; lateral veins 4–6 pairs, these and reticulate tertiary venation prominent beneath; petiole 2–5 mm long.
Morphology Reproductive morphology Inflorescences
Inflorescence subglobose or capitate, 2–3.5 cm in diameter; bracts, bracteoles and outer calyx lobes tinged purple in distal half along margin and principal veins; bracts (ovate-)elliptic to obovate, 18.5–23.5(30) × 7.5–9(18) mm, dense buff to golden long-armed dendritic hairs particularly on margin and principal veins; bracteoles narrowly elliptic or oblanceolate, 14.5–22.5 × 1.7–3.5 mm.
Morphology Reproductive morphology Flowers Calyx
Anterior calyx lobe ovate-elliptic, 17.5–24 × 8–10 mm, apex bifid with deltate segments, 1.7–4.5 mm long, venation subparallel, indumentum as for bracts but largely glabrous in proximal third except for pale marginal hairs; posterior lobe elliptic, 18.5–25 × 6–10 mm, apex acute or obtuse, long-armed stellate hairs restricted to distal half or third, largely glabrous towards base except for simple hairs along margin; lateral lobes linear-lanceolate, 8.5–12.5 mm long.
Morphology Reproductive morphology Flowers Corolla
Corolla 62–79 mm long, blue or purple, glabrous externally; tube 32–41 mm long, cylindrical in proximal two-thirds, funnel-shaped or narrowly so above; lobes each 22–39 × 14–20 mm, abaxial lobe offset by 5.5–7 mm.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens attached ± midway along corolla tube or in distal half; filaments 23–30 mm long; anthers 3.4–4.3 mm long; lateral staminodes 2.5–4.5 mm long, pilose, antherodes 0.4–0.7 mm long.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary glabrous; style puberulous at base; stigma c.3.5 mm long.
Morphology Reproductive morphology Fruits
Capsule and seeds not seen.
Distribution
Also in E Angola (see below).
Ecology
Grassland on sandy soils, miombo woodland and in dambos; 1100–1250 m.

[KBu]

Darbyshire, I. (2008). New species in Barleria sect. Stellatohirta (Acanthaceae) from Africa. Kew Bulletin 63: 261. https://doi.org/10.1007/s12225-008-9028-8

Conservation
Despite the large, showy flowers of this species, this species is only known from three collections. South-western Zambia is, however, rather poorly known botanically and it is also possible that this species occurs in the underexplored eastern region of Angola. Furthermore, little information is available on the abundance of this species at the known sites and nothing is known of the current status of the subpopulations. Barleria purpureotincta is therefore presently assessed as Data Deficient (DD) under IUCN (2001) guidelines.
Diagnosis
B. aeneae similis sed parte cylindricala tubi corollae multo longioribus, filamentis staminalibus pilos eglandulatos (nec glandulosa minutes) ferentibus, staminodiis brevioribus, bracteolis angustioribus differt.
Distribution
South-western Zambia (Flora Zambesiaca regions: B & S).
Ecology
Barleria purpureotincta is recorded in grassland and open miombo woodland on sandy soils. Zimba et al. (757) recorded it at 1260 m alt. but no other altitudinal data are available. Information on abundance is scant, but Mitchell (26/04) recorded only a small colony of plants from a streamside grass dambo, noting it as rare.
Morphology General Habit
Suffrutescent perennial herb, 20 – 40 cm tall with numerous unbranched or few-branched erect stems from a woody rootstock
Morphology Leaves
Leaves narrowed into a short petiole, 2 – 5 mm long; blade narrowly elliptic to somewhat obovate, 5 – 9 cm long, 2 – 3 cm wide, base cuneate, margin subentire, apex acute to subattenuate, more rarely obtuse; lower surface with ± dense pale buff stellate hairs and with additional buff to golden long-armed dendritic hairs along the margin and nerves, upper surface with pale long-armed stellate hairs; lateral nerves 4 – 6 pairs, these and the reticulate tertiary venation raised and conspicuous beneath
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2, attached at or above midway along the corolla tube; filaments 24 – 30 mm long, pubescent in the lower half and with minute subsessile glands towards the base; anthers 3.4 – 4.3 mm long
Morphology Reproductive morphology Flowers Androecium Staminodes
Staminodes 2; filaments 2.5 – 3.5 mm long, pilose; antherodes 0.4 – 0.7 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx 4-lobed; anticous lobe ovate-elliptic, 17.5 – 24 mm long, 8 – 10 mm wide, apex bifid, segments acutely to obtusely deltate, 2.5 – 4.5 mm long, venation subparallel, indumentum as bracteoles outside but largely glabrous in the lower third except for pale marginal hairs, appressed pubescent within, the hairs longer and golden towards the apex, shorter and whitish towards the base; posticous lobe elliptic, 18.5 – 25 mm long, 6 – 8.5 mm wide, apex acute to obtuse, venation parallel, outer indumentum restricted to the upper half to third, largely glabrous towards the base except for simple marginal hairs, as anticous lobe within; lateral lobes subulate, 10 – 10.5 (– 12.5) mm long, with dense white stellate hairs outside and pale simple hairs on the margin and within
Morphology Reproductive morphology Flowers Corolla
Corolla 67 – 79 mm long, blue to purple, glabrous outside; tube 34 – 40.5 mm long, cylindrical in the lower two thirds where 2.3 – 3.5 mm deep, funnel-shaped in the upper third, expanded to 7 – 12 mm deep at the mouth, pilose within around the attachment of the stamens; limb 5-lobed, the abaxial lobe split from the tube ± 7 mm before the lateral pair which in turn split ± 5 mm before the adaxial pair, each obovate, 22 – 38.5 mm long, 14 – 20 mm wide
Morphology Reproductive morphology Flowers Disc
Disk cupular, margin irregular
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary glabrous; style glabrous except at base where puberulous; stigma filiform, curved, ± 3.5 mm long
Morphology Reproductive morphology Fruits
Capsule and seeds not seen.
Morphology Reproductive morphology Inflorescences
Synflorescences terminal, subglobose, 2 – 3.5 cm in diameter, bracts, bracteoles and outer calyx lobes tinged purple in the upper half, along the margin and on the principal veins at least when dry; bracts (ovate-) elliptic to obovate, 18.5 – 23.5 (– 30) mm long, 7.5 – 9 (–18) mm wide, base broad, acute, apex shortly attenuate, outer surface with dense buff to golden long-armed dendritic hairs particularly on the margin and principal veins, glabrous within; bracteoles narrowly elliptic to oblanceolate, 14.5 – 22.5 mm long, 1.7 – 3.5 mm wide, base cuneate, apex acute, indumentum as bracts but more dense outside and with or without scattered simple hairs towards the apex within
Morphology Stem
Stems reddish-brown, with dense buff to golden dendritic hairs, many with a long antrorse arm, the hairs ± persistent on the mature stems where paler
Note
Barleria purpureotincta has, like B. aenea, previously been confused with B. subglobosa on herbarium specimens. This mistake originally arose from the naming of Fanshawe 6211 at K as “Barleria ? subglobosa S. Moore. If so, new to N[orthern] R[hodesia] (no fls. on Kew sheets [of B. subglobosa]”. B. purpureotincta is however readily separated from both this species and from the closely related Angolan species B. stellato-tomentosa S. Moore (with which it shares the distinctive purple-tinged apices to the bracts, bracteoles and calyx) by having much larger flowers. The specific epithet, formed from “purpureus” (purple) and “tincta” (tinged), refers to the conspicuous deep purple colouring on the upper portion of the bracts, bracteoles and calyx in the dried material of this species. It is unclear as to whether this colouring is so clear in living material but it is one of the diagnostic characters in herbarium specimens.
Type
Zambia, Machili, Fanshawe 6211 (holotypus K!; isotypus NDO).

Native to:

Angola, Zambia

Barleria purpureotincta I.Darbysh. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Fanshawe, D.B. [6211], Zambia K000794970 holotype

First published in Kew Bull. 63: 267 (2008)

Accepted by

  • Darbyshire, I., Vollesen, K. & Kelbessa, E. (2015). Flora Zambesiaca 8(6): 1-314. Royal Botanic Gardens, Kew.

Literature

Kew Bulletin

  • Balkwill, M.-J. & Balkwill, K. (1997). Delimitation and infra-generic classification of Barleria (Acanthaceae). Kew Bull. 52: 535 – 573.
  • Balkwill, M.-J. (1998). Barleria Sect. Stellatohirta. p. 110. In: M.-J. Balkwill & K. Balkwill, A preliminary analysis of distribution patterns in a large, pantropical genus, Barleria L. (Acanthaceae). J. Biogeogr. 25: 95 – 110.
  • IUCN (2001). IUCN Red List Categories and Criteria. Version 3.1. IUCN Species Survival Commission, IUCN, Gland, Switzerland and Cambridge, UK.
  • Moore, S. le M. (1911). Alabastra diversa. Part XXI. Acanthaceae Africanae novae. J. Bot. 49: 293 – 298 & 305 – 313.
  • White, F. (1983). Vegetation of Africa. A descriptive memoir to accompany the Unesco/AETFAT/UNSO vegetation map of Africa. Unesco, Paris, France.

Flora Zambesiaca

  • in Kew Bull. 63: 267, fig.3 (2008).

Kew Backbone Distributions

  • Darbyshire, I., Vollesen, K. & Kelbessa, E. (2015). Flora Zambesiaca 8(6): 1-314. Royal Botanic Gardens, Kew.

Flora Zambesiaca
Flora Zambesiaca
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 Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/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