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This species is accepted, and its native range is Namibia.

[KBu]

Darbyshire, I., Tripp, E.A. & Chase, F.M. (2019). A taxonomic revision of Acanthaceae tribe Barlerieae in Angola and Namibia. Part 1. Kew Bulletin 74: 5. https://doi.org/10.1007/s12225-018-9791-0

Conservation
Barleria craveniae has a highly restricted range in southern Namibia, with an EOO of only 895 km2. Only a few plants were recorded at Wegdraai by N. Batault & S. Helary (143). However, P. Craven recorded it as locally common to very numerous at Mara Farm (her 2563 and 3627). The arid region in which this species occurs is sparsely populated by man, and threats from human activity appear to be minimal, although over-browsing by domestic goats may exsert some pressure. Therefore, despite its very small range, this species is currently assessed as of Least Concern — LC. However, this species qualifies as “Rare” (sensu Raimondo et al. 2009) in view of its small EOO coupled with the low density of individuals.
Distribution
Endemic to southern Namibia (Karas Region).
Ecology
Barleria craveniae grows in dry riverbeds and washes, either on sandy soils or amongst rocks, growing in full sun amongst open dry shrubland; c. 300 – 850 m elevation. It is recorded mainly from the Desert-Dwarf Shrub Transition vegetation type of Mendelsohn et al. (2002). It is a member of the ancient Huns-Orange floristic group of Craven (2009) and is a component of the Gariep Centre of plant endemism (sensu van Wyk & Smith 2001).
Morphology General Habit
Spiny shrub or shrublet to 60 – 150 cm tall, much branched, rounded to cushion-shaped; young stems angular, white-puberulous in two opposite bands, hairs retrorse; stems soon turning woody with white peeling epidermis
Morphology Leaves
Leaves coriaceous, obovate or elliptic when flattened but blade conduplicate and curved, 8 – 23 × 5 – 11 mm (l:w ratio 1 – 2:1), base attenuate or cuneate, margin thickened and pale, usually with 1 – 6 harsh spines per side, apex acute to rounded and spine-tipped, surfaces puberulent; lateral veins 2 – 3 pairs but often indistinct; petiole to 3 mm long, not well differentiated from tapered leaf base
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted 6.8 – 8.5 mm from base of corolla tube; filaments c. 18 – 21 mm long; anthers exserted, 2.8 – 3.3 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx at first green to purple with darker venation, later turning sandy- to white-scarious; anterior lobe oblong-elliptic to somewhat obovate, 6.5 – 10 × 3.5 – 4.5 mm, base cuneate, margin spinulose-denticulate or proximal half entire, apex spinulose or shortly bifid, venation palmate-reticulate, external surface minutely glandular- and eglandular-puberulous and sometimes with antrorse eglandular hairs, or surface largely glabrous; posterior lobe like anterior but more elliptic, 9.5 – 11.5 × 4 – 5.5 mm, apex more markedly spine-tipped; lateral lobes linear-lanceolate, 5.5 – 9 mm long, more densely glandular-puberulous
Morphology Reproductive morphology Flowers Corolla
Corolla pink, mauve or lilac, darker along midvein of adaxial lobes, c. 24 – 31.5 mm long, pubescent externally with mixed eglandular and glandular hairs; tube cylindrical, 12 – 16 mm long; limb in “2+3” configuration but with abaxial lobe offset by 2.5 – 3.5 mm from remaining lobes, all lobes somewhat reflexed, abaxial lobe obovate to oblanceolate, 11 – 14 × 6 – 6.5 mm, apex rounded and sometimes minutely apiculate; lateral lobes as abaxial but can be more elliptic, 10 – 14 × 5 – 6 mm; adaxial lobes subulate or spathulate, 11 – 13.5 × 1.7 – 2.7 mm, shortly fused at base, apices acute to rounded, minutely apiculate
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary with sparse short retrorse hairs or glabrous except for dense minute crisped white hairs at attachment point of style and extending onto style base; stigma subcapitate to clavate, 0.3 – 0.5 mm long
Morphology Reproductive morphology Fruits
Capsule 4-seeded, with distal half exposed beyond the calyx, 16 – 18 mm long, notably turgid, exposed portion matt-black, glabrous; seeds triangular, 5 – 6 × 4 – 4.5 mm.
Morphology Reproductive morphology Inflorescences
Inflorescences axillary but clustered towards stem apices, can appear terminal, of contracted unilateral cymes 1 – 5 cm long, 2 – 10-flowered; bracts foliaceous; primary peduncle to 5 mm long or cymes sessile; bracteoles glaucous-green or at first purplish, later turning pale sandy coloured or white, pairs slightly unequal in size, the larger held erect and adpressed to calyx, the smaller parallel to the inflorescence axis, those in the distal portion of the cyme ovate or narrowly so, 8 – 12 × 2.5 – 5.5 mm, margin with 5 – 7 short spines per side, apex spinose, midrib prominent, surface glabrous or puberulous; proximal-most pair of bracteoles usually narrower, longer and more divergent; whitish sterile bracteoles often present at lower nodes as stiff spines, lanceolate, 11 – 19 (– 24) × 3 – 5 mm, apex harshly spinose, pairs divergent; flowers sessile
Note
This species resembles Barleria papillosa, but differs in the markedly smaller calyces, the posterior lobe being elliptic or somewhat obovate, 9.5 – 11.5 × 4 – 5.5 mm, with base cuneate (vs usually broadly ovate or ovate-elliptic, 15 – 20.5 × (6 –) 11 – 15 mm with base obtuse to shallowly cordate in B. papillosa); in the inflorescence having short, often sparse and inconspicuous glandular hairs only (vs dense conspicuous glandular hairs throughout); and in the distal half of the capsule being exposed beyond the calyx and being matt-black (vs largely enclosed within the calyx and glossy (green-) black). It additionally differs in having smaller and more ovate fertile bracteoles, 8 – 12 mm long (vs lanceolate, 10.5 – 19 mm long), in having considerably shorter axillary “spines” (sterile bracteoles) at lower nodes, 11 – 19 (– 24) mm long, which are less clearly differentiated from the fertile bracteoles (in B. papillosa these are harsh linear-lanceolate spines 17 – 38 mm long and clearly different to the fertile bracteoles) and in having smaller anthers, 2.8 – 3.3 mm long (vs 3.8 – 4.5 mm in B. papillosa). This species is named for Patricia Craven, in honour of her valuable contribution to our understanding of the flora and phytogeography of Namibia. This species is closely associated with Pat since she collected the type collection and her family own Mara Farm, one of the few known localities for this rare species. This newly described species is clearly closely allied to Barleria papillosa; the two species share the unusual corolla morphology with subulate or narrowly spathulate adaxial lobes, and have similar vegetative parts. However, the inflorescences look very different due to the differing calyx, bracteoles and indumentum, hence they are considered to be allopatric vicariant species, both confined to the Gariep Centre of plant endemism of the Orange (Gariep) River and its tributaries. Barleria craveniae occurs in the small area of southwestern Namibia that receives both summer and winter rainfall, although annual rainfall is very low in this area (Mendelsohn et al. 2002).
Type
Namibia, Karas, Bobbejaankranz Farm 180, floodplain area of Konkiep R. near farmhouse, fl. 28 June 1991, Craven 3909 (holotype WIND!).

Native to:

Namibia

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

First published in Kew Bull. 74(1)-5: 42 (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.

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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

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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