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This species is accepted, and its native range is Socotra (Abd al Kuri).


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

Vulnerable. Rare with a very limited area of occupancy.
Endemic to Yemen; known only from the island of ‘Abd al Kuri in the Soqotra archipelago, where it seems to be increasing.
Dried up wadi beds on coastal plain; near sea level to 10 m.
Morphology General Habit
Subshrub 60 cm high, fastigiate, densely branched, dark green; terminal branches rigid, sparsely appressed silky-pubescent at first, soon becoming glabrous and green, spinose
Morphology Leaves
Leaves sessile or with very short petiole to 1 mm Leaf blades narrowly linear lanceolate, 4 – 12 × 0.8 – 1.5 mm, acute at the apex, cuneate at the base, appressed silvery pubescent
Morphology Reproductive morphology Flowers
Flowers axillary, solitary; peduncle absent; pedicels up to 1 mm long
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5, with filaments c. 5 – 5.5 mm long, papillate at the base; anthers linear, c. 1.1 mm
Morphology Reproductive morphology Flowers Calyx
Calyx tubular-ellipsoid, constricted at mouth; sepals unequal, 2 external ones semicartilaginous, elliptic oblong or obovate, c. 6 × 3 mm, acute at the apex, glabrous to minutely pilose outside and pubescent on the margins, three interior ones rounded rhomboid, 5 – 6 × 4 mm, acute at the apex, pubescent at the narrow, hyaline margins
Morphology Reproductive morphology Flowers Corolla
Corolla white, 9 – 10.5 mm long, funnel-shaped, pubescent on mid-petaline areas
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 2-locular with 4-ovules
Morphology Reproductive morphology Flowers Gynoecium Style
Style apparently simple but readily separable into 2 halves with bifid tip, c. 8.5 mm long with subglobose stigmas
Morphology Reproductive morphology Fruits
Capsules and seeds not seen.
The species is so far known from the Soqotran archipelago, where it is apparently endemic to the islet of ‘Abd al Kuri. Records from Soqotra island itself need verification; the only records from Soqotra are two of the syntypes collected by Paulay and/or Simony, from Kalansiye (= Qalansiyyah; 13 Jan. 1899) and Qadhub near Djebel Mauna (24 Feb. 1899). A photograph of the former is not very clear but it shows a plant with the exserted part of the corolla much shorter than the calyx, and the older stems appear to be hairy, thus agreeing with Seddera fastigiata (which occurs on Soqotra) and not with S. spinosa. This would make sense geographically. The other specimen has not been seen even as a photograph. This speces was originally based on three former syntypes: Paulay s.n. which is designated above as the lectotype, Simony s.n. (WU; from the photo RRM has seen, this specimen appears to represent S. fastigiata, which is the only species of this group to occur on Soqotra) and “Südlich von Quadob. Umgebungen des Djebel Maûna, 24 Feb. 1899” (collector not stated in the protologue but presumably either Paulay or Simony, WU, not seen).
Flowering time: January and February; October and November.
Soqotra, Soqotra archipelago, ‘Abd al Kuri island, Hallat Salih up to the N foot of Djebel Salih (Qarat Salih), 17 – 21 Jan. 1899, Paulay s.n. (lectotype WU, n.v., photo. K, designated here by Mill).
zeydirih, zidirih, zeydiroh (Soqotri; Miller & Morris 2004).

Miller & Morris (2004) record that this is one of the most important and nutritious forage plants for goats on ‘Abd al Kuri. Thicker stems of the species are used as fuel and are the preferred wood for cooking as little smoke is given off, while thinner twigs are stored as tinder.

Native to:


Convolvulus kossmatii Vierh. appears in other Kew resources:

First published in Denkschr. Kaiserl. Akad. Wiss., Wien. Math.-Naturwiss. Kl. 71: 416 (1907)

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.

Not accepted by

  • Al Khulaidi, A.W.A. in Al Khulaidi, A.W.A. (2012). Fl. Yemen Convolvulaceae + Cuscutaceae Flora of Yemen: 73-76 + 80. EPA and UNDP, Republic of Yemen. [Cited as Seddera spinosa.]
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Convolvulus socotranus.]
  • Miller, A.G. & M. Morris in Miller, A.G. & M. Morris (2004). Ethnofl. Soqotra Archipel. Convolvulaceae + Cuscutaceae Ethnoflora of the Soqotra Archipelago: 516-524. Royal Botanic Garden Edinburgh. [Cited as Seddera spinosa.]
  • Sebsebe Demissew & R.R. Mill (2009). Revision of the genus Seddera (Convolvulaceae) Kew Bulletin 64: 197-233. [Cited as Seddera spinosa.]


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.