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This species is accepted, and its native range is NE. Tropical Africa to N. Uganda, SW. Yemen.

[FTEA]

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

Type
Type: Yemen, Bilad Fodhli, Serrya, Deflers 1032 (P!, lecto., selected by Vollesen, l.c.; P!, iso.)
Morphology General Habit
Intricately branched often cushion-shaped shrubby herb or shrub to 1 m tall, often with arching branches which sometimes root on touching ground; young branches whitish puberulous or sparsely so (rarely subglabrous) with simple and/or stellate hairs, sometimes also with scattered long broad glossy hairs to 2(–3) mm long
Morphology Leaves
Leaves often greyish, rough and leathery, elliptic or obovate to suborbicular, largest 1–3(–4.5) × 0.7–2.3(–2.8) cm, apex truncate to retuse (rarely acute), with a triangular usually recurved tip, base cuneate (rarely truncate), decurrent into a distinct petiole to 5(–8) mm long, margin crenate to dentate (rarely subentire), the teeth often bent downwards, sparsely to densely (when young) stellate puberulous (but see note), usually also with scattered long broad glossy hairs and sometimes with fine puberulent simple hairs; stipule sheath 0.5–1 mm long. Flowers subsessile, in 1–5-flowered condensed axillary cymes (rarely with cymes on lateral branches to 5(–35) mm long, bracts foliaceous, to 1.5 cm long, basal part scarious, middle part narrowed below an expanded leafy apical part, basal part with dense (rarely sparse) long broad glossy hairs, apical part as leaves; bracteoles oblanceolate, to 1 cm long, with similar indumentum or with long glossy hairs all over
Morphology Reproductive morphology Flowers Calyx
Calyx 6–14 mm long, finely puberulous with simple and/or stellate hairs and with sparse to (usually) dense long broad glossy hairs; tube 4–10 mm long; teeth triangular or narrowly so, acute to acuminate, dorsal 2–4 mm long, ventral 1–4 mm long of which the free part 0.5–1.5 mm
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1–5 mm long, glabrous or with a few hairs near base; anthers 1.5–2.5 mm long, rounded, connective glabrous
Morphology Reproductive morphology Flowers Gynoecium Stigma
Dorsal stigma lobe about half the length of ventral (rarely subequal)
Morphology Reproductive morphology Seeds
Seed 3–5 × 2–4 mm
Morphology Branches
Young branches puberulous or sericeous-puberulous or sparsely so (rarely glabrous or subglabrous) with simple and/or stellate hairs, sometimes also with scattered long broad glossy hairs to 2(–3) mm long, stellate hairs with the central hair in each cluster same length as the rest
Morphology Reproductive morphology Inflorescences Bracts
Bracts and bracteoles with glossy hairs 2–3 mm long. Calyx 6–11(–13) mm long, puberulous and with sparse to dense long glossy hair to 2 mm long, dorsal tooth 2–3 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla 9–16(–18) mm long Corolla white to cream with red or purple patches on lower lip, 9–19 mm long, finely sericeous-puberulous; tube 6–13 mm long of which the throat 2–4 mm; lips 2–6 mm long; lobes oblong, 1–3 mm wide, retuse (rarely truncate or rounded); palate indistinctly pleated, without long stiff hairs
Morphology Reproductive morphology Fruits
Capsule 5–8 mm long Capsule 5–10 mm long, obovoid
Ecology
Dry often semi-desert areas with open Acacia or Acacia-Commiphora bushland, often on alluvial soils, dry riverine scrub; 200–1050(–1400) m
Note
Often reported as the dominant shrub over large areas of Turkana and Northern Frontier Districts. Two collections Hucks 305 and 1174, from the area in eastern Kenya shared with D. stoloniferum, have larger corollas (18 mm) with longer (6 mm) rounded lobes than normal D. longicalyx subsp. longicalyx from this area. They might be the result of hybridisation between the two species, but seem to have normally developed anthers. An almost completely glabrous form occurs around Marsabit ( K 1), it does however, have stellate hairs on the very youngest leaves. It is easily recognised by the obovate leaves with truncate-retuse apex. Examples are Faden 68/554 and J. G. Williams EAH 11038. U.K.W.F. (l.c.) mentions that D. longicalyx seems to be poikilohydric. It is therefore an important source of browse as well as of water for night feeding animals in Northern Kenya.
Distribution
Flora districts: U1 K1 K2 K4 K6 K7 Range: Sudan, Ethiopia, Somalia; Yemen

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Shrub or subshrub up to c. 25–60 cm tall
Morphology Stem
Stem green or greyish pink, almost glabrous to very densely pubescent with c. 0.3 mm long white appressed hairs
Morphology General Indumentum
Nodes, petioles, base of leaf-blades, bracts, bracteoles and calyx provided with a ± conspicuous indumentum of white up to c. 3 mm long hairs
Morphology Leaves
Leaf-blades somewhat crenate to distinctly crenate-dentate, narrowly ovate to obovate, up to 10–30 x 13–23 mm, rough to densely pubescent with stellate and simple hairs, apex truncate, base attenuate; petiole up to 4–8 mm long
Morphology Reproductive morphology Inflorescences
Flowers single or several together at upper nodes; bracts spathulate, up to 12 x 7 mm; bracteoles narrowly spathulate, up to 12–13 x 5.5–7 mm
Morphology Reproductive morphology Flowers Calyx
Calyx-lobes with a dense indumentum of up to 0.2–2 mm long antrorse hairs along margins and midvein; lower lobe oblanceolate, 2-fid at the apex, c. 7–9 x 2 mm, enlarging to c. 12 mm in fruit; upper lobe narrowly elliptic, up to c. 6 x 2 mm; lateral lobes linear
Morphology Reproductive morphology Flowers Corolla
Corolla white or cream, usually with reddish markings on lower lip, 9–12(–18) mm long; tube 8(–13) mm long; lobes free from each other for c. 4 mm
Morphology Reproductive morphology Fruits
Capsule 5.5–6 mm long, shining, glabrous.
Distribution
N2, 3; C1, 2; S1, 3; Ethiopia, Sudan, Uganda, Kenya, Tanzania, Yemen
Ecology
Altitude range 20–900 m.
Vernacular
Sarin, sarren (Somali)
Note
Three subspecies were recognized by Vollesen (2006), and the Somali plant is subsp. longicalyx. Vollesen also recognized D. actinotrichum as a distinct species, but this is here regarded as just an extreme form of D. longicalyx.

Native to:

Ethiopia, Kenya, Somalia, Sudan, Tennessee, Uganda, Yemen

Duosperma longicalyx (Deflers) Vollesen appears in other Kew resources:

First published in Kew Bull. 61: 315 (2006)

Accepted by

  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
  • Hedberg, I., Kelbessa, E., Edwards, S., Demissew, S. & Persson, E. (eds.) (2006). Flora of Ethiopia and Eritrea 5: 1-690. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
  • Thulin, M. (ed.) (2006). Flora of Somalia 3: 1-626. The Royal Botanic Gardens, Kew.
  • Vollesen, K. (2008). Flora of Tropical East Africa, Acanthaceae(1): 1-285.

Literature

Kew Backbone Distributions

  • Hedberg, I., Kelbessa, E., Edwards, S., Demissew, S. & Persson, E. (eds.) (2006). Flora of Ethiopia and Eritrea 5: 1-690. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
  • Thulin, M. (ed.) (2006). Flora of Somalia 3: 1-626. The Royal Botanic Gardens, Kew.

Flora of Somalia

  • Flora Somalia, Vol 1, (1993) Author: by M. Thulin [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • F.E.E. 5: 373 (2006)
  • Fl. Somalia 3: 391 (2006).
  • K.B. 62: 315 (2006)
  • K.B. 62: 316, fig. 8, A–H (2006)

Flora of Somalia
Flora of Somalia
http://creativecommons.org/licenses/by-nc-sa/3.0

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