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This species is accepted, and its native range is Socotra (Semha).


Demissew, S. & Mill, R.R. (2009). Revision of the genus Seddera (Convolvulaceae). Kew Bulletin 64: 197.

Vulnerable (VU). Rare with a very limited area of occupancy.
Endemic to Yemen; known only from the island of Semha in the Soqotran archipelago.
Open shrubland on rocky slopes and cliffs, with Atriplex griffithii; 100 – 200 m.
Morphology Branches
Branches numerous, ± spreading; those of current year straight and rigid, 0.7 – 1.5 mm thick, slightly striate longitudinally, reddish-brown or brownish but underlying colour obscured by very dense, canescent indumentum of adpressed hairs (except for subglabrous apices of spinescent branches); branches of second-year growth woody, reddish-brown, 2 – 4 mm thick, with sparser persistent hairs
Morphology General Habit
Greyish shrub 30 – 50 cm tall
Morphology Leaves
Leaves shortly petiolate; lamina narrowly lanceolate, 6 – 8 × c. 1.2 mm on primary shoots but 2.5 – 5 × 0.6 – 1.6 mm on lateral shoots and on shoots that have been grazed, subacute or obtuse at the apex, obtuse or very broadly subtruncate at the base; both surfaces very densely greyish-sericeous; petiole 0.5 – 1.2 mm long usually ± adnate to stem but sometimes divergent from it
Morphology Reproductive morphology Flowers
Flowers solitary (rarely paired), axillary, subsessile (pedicel less than 0.5 mm long)
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted at middle of corolla tube; filaments 3.5 – 4 mm long, white, completely flattened throughout except at their apex, the lower part expanded and covered with minute very shortly stipitate papillae
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers narrowly ellipsoid, 1 – 1.2 mm
Morphology Reproductive morphology Flowers Calyx
Outer 2 sepals herbaceous (not cartilaginous), 6 – 6.5 × 1.5 – 1.8 mm, acuminate without a mucro, dark green but greyish-sericeous all over outer surface, convex, glabrous inside; inner 3 sepals ovate, semicartilaginous, 5.2 – 6.2 mm, the innermost very thin Calyx c. 7 mm, the lower part (‘tube’) ellipsoid and slightly contracted at its mouth, the apical part (‘lobes’) 1.5 – 3 mm (1/3 – 1/2 × length of calyx).
Morphology Reproductive morphology Flowers Corolla
Corolla white, faintly flushed pink except on mid-petaline bands, infundibular, 7 – 8.5 mm long, densely covered throughout its length outside (not just on the part exserted from the calyx) with very long sericeous indumentum, the hairs loosely adpressed or somewhat spreading; corolla tube c. 3.5 mm
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary c. 1 mm, ovoid-ellipsoid, with thin erect hairs towards the apex
Morphology Reproductive morphology Flowers Gynoecium Style
Style apparently simple except at the apex, diverging at apex into two arms each bearing a pyriform stigma c. 0.7 × 0.2 mm
Morphology Reproductive morphology Fruits
Capsule ovoid c. 2 × 2 mm, pilose at apex
Morphology Reproductive morphology Inflorescences Bracteoles
Bracteoles c. 5 mm, subequal to calyx, suberect with tips recurved
Morphology Reproductive morphology Seeds
Seeds 1 or 2 by abortion, ovoid-ellipsoid, c. 2 × 1 mm.
The discovery of this new species, together with the clarification of the distribution of Seddera spinosa, means that each principal island within the Soqotran archipelago has one member of sect. Socotroseddera: S. fastigiata on Soqotra (to which it is endemic), S. spinosa on ‘Abd al Kuri (endemic) and S. semhaensis (endemic on Semha). Other examples of this pattern of endemism on the Soqotran archipelago include species of Lochia Balf. f. and Heliotropium L. (Miller, pers. comm. to RRM, 1995). A collection from eastern Soqotra (Miller 17061, collected in 1999) requires further study; it resembles S. semhaensis more than the previously sole known Soqotran species, S. fastigiata. However, it has been assigned to S. fastigiata.
Flowering time: ?October.
Soqotra, Island of Semha, lower slopes of mountains N of village, 12°08.5′N, 53°03.9′E, 10 Feb. 1992, A. G. Miller 11461A (holotypus E).

Seddera semhaensis is one of the most important forage plants for sheep on Semha. The milk of animals that graze heavily on it is very sweet and much liked. Dead and dried plants are used as fuel (Miller & Morris 2004).

Native to:


Convolvulus semhaensis (R.R.Mill) J.A.Luna & Carine appears in other Kew resources:

First published in Phytotaxa 156: 51 (2013 publ. 2014)

Accepted by

  • Luna, J.A., Sebsebe Demissew, Darbyshire, I., & M.A. Carine (2013). The significance of one style versus two styles: the return of Seddera section Socotroseddera to Convolvulus Phytotaxa 156(1): 47-53.
  • Wood, J.R.I., Williams, B.R.M., Mitchell, T.C., Carine, M.A., Harris, D.J. & Scotland, R.W. (2015). A foundation monograph of Convolvulus (Convolvulaceae) PhytoKeys 51: 1-282.


Kew Backbone Distributions

  • Sebsebe Demissew & R.R. Mill (2009). Revision of the genus Seddera (Convolvulaceae) Kew Bulletin 64: 197-233.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 World Checklist of Selected Plant Families.

Kew Bulletin
Kew Bulletin

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.