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This species is accepted, and its native range is Tanzania (Iringa).

[KBu]

Goyder, D.J. (2008). Tylophora tridactylata (Apocynaceae: Asclepiadoideae), a new species from southern Tanzania. Kew Bulletin 63: 467. https://doi.org/10.1007/s12225-008-9067-1

Conservation
EN B2(b)(ii,iii). Tylophora tridactylata is assessed here as Endangered as it is known only from a few populations (using criterion B2 of the IUCN (2001) Red List categories and criteria) and both the quality and extent of suitable forest habitat in southern Tanzania is threatened.
Distribution
Restricted to the Sanje and Uzungwa escarpment forests of southern Tanzania.
Ecology
Wet forest with Allanblackia, Bridelia, Macaranga and Parinari; 1200 – 1600 m
Morphology General Habit
Slender twiner to 5 m, stems with pubescence restricted to two longitudinal lines
Morphology Leaves
Leaves not succulent; petiole 1 – 8 mm long, glabrous; lamina 2 – 3.5 × 0.1 – 0.2 cm, linear or very rarely narrowly triangular, with or without a pair of basal lobes to 1 cm long held at an angle of c. 45° to the midrib, tips to lobes rounded, apex of principal blade rounded to acute, minutely apiculate, base generally cuneate, with minute colleters near attachment to the petiole, minutely pubescent with any indumentum ± restricted to margins and principal veins
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal corona lobes fleshy, ovoid, c. 0.3 mm long, radiating from the staminal column and adnate to it to the base of the anthers
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings 0.1 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx lobes c. 0.5 mm long, ovate to narrowly triangular, glabrous or minutely pubescent
Morphology Reproductive morphology Flowers Corolla
Corolla dark red, pubescent adaxially at least in lower half of lobes, rotate, united at the base only, lobes 1 – 1.5 × 0.7 – 1 mm, ovate, apex rounded to subacute
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head flat
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium green, c. 0.4 mm long
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria minute, the pollinia c. 0.1 mm long
Morphology Reproductive morphology Fruits
Follicles single, c. 7 × c. 0.3 cm, narrowly fusiform with a long slender beak, smooth; seeds not seen.
Morphology Reproductive morphology Inflorescences
Inflorescences extra-axillary, sessile, few-flowered; pedicels 5 – 7 mm long, glabrous
Note
Tylophora tridactylata differs from T. gracillima in a number of other characters. Vegetatively, the indumentum on young shoots is restricted to two lines rather than being distributed uniformly around the stem, and is less prominent than in T. gracillima. The leaf lamina is longer than in T. gracillima (2 – 3.5 cm rather than 0.7 – 1.6 cm) and different in outline — without the basal lobes, it is linear rather than lanceolate to ovate, and the base is cuneate rather than rounded. Inflorescences are sessile not pedunculate and the corolla is pubescent adaxially. Most collections of Tylophora tridactylata have conspicuous basal lobes on the leaves held at an angle of c. 45° to the midrib, giving a very distinctive appearance. Toothed or lobed leaves are extremely unusual in Asclepiadoideae. They are known to occur in the enigmatic Emicocarpus fissifolius K. Schum. & Schltr., a rare and little understood species from southern Mozambique, and in some species of Ceropegia (e.g. C. paricyma N. E. Br. from Tanzania, Mozambique, Malawi, Zambia and Namibia, and Tanzanian collections of C. namuliensis Bruyns).
Type
Tanzania, Iringa Distr., Mufindi, Kigogo R., 19 March 1962, Polhill & Paulo 1813 (holotypus K (sheets 1 – 5)).

[FTEA]

Apocynaceae (part 2), David Goyder, Timothy Harris, Siro Masinde, Ulrich Meve, Johan Venter. Flora of Tropical East Africa, 2012

Morphology General Habit
Slender herbaceous twiner to 5 m, stems with pubescence restricted to two lines
Morphology Leaves
Leaves not succulent; petiole 1–8 mm long, glabrous; lamina linear or very rarely narrowly triangular, 2–3.5 × 0.1–0.2 cm, with or without a pair of basal lobes to 1 cm long held at an angle of ± 45° to the midrib, tips to lobes rounded, apex of principal blade rounded to acute, minutely apiculate, base generally cuneate, with minute colleters, minutely pubescent with any indumentum ± restricted to margins and principal veins
Morphology Reproductive morphology Inflorescences
Inflorescences extra-axillary, sessile, few-flowered.
Morphology Reproductive morphology Flowers Pedicel
Pedicels 5–7 mm long, glabrous
Morphology Reproductive morphology Flowers Calyx
Calyx lobes ovate to narrowly triangular, ± 0.5 mm long, glabrous or minutely pubescent
Morphology Reproductive morphology Flowers Corolla
Corolla dark red, pubescent adaxially at least in lower half of lobes, rotate, united at the base only; lobes ovate, 1–1.5 × 0.7–1 mm, apex rounded to subacute
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium green, ± 0.4 mm long
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal corona lobes fleshy, ovoid, ± 0.3 mm long, radiating from the staminal column and adnate to it to the base of the anthers
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings 0.1 mm long.
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria minute
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head flat
Morphology Reproductive morphology Fruits
Follicles single, narrowly fusiform, ± 7 × ± 0.3 cm, with a long slender beak, smooth.
Morphology Reproductive morphology Seeds
Seed not seen
Figures
Fig 122, p 511
Ecology
Wet forest; 1200–1600 m
Note
Differs from T. gracillima in the less prominent indumentum of young shoots which is restricted to two lines rather than uniformly distributed around the stem; the leaf lamina is longer, linear rather than lanceolate to ovate, and in addition may have weakly or strongly developed basal lobes; base cuneate; inflorescence sessile not pedunculate and corolla pubescent adaxially.
Distribution
Flora districts: T6 T7 Range: Endemic to the Sanje/Udzungwa region

Native to:

Tanzania

Vincetoxicum tridactylatum (Goyder) Meve & Liede appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2008 Polhill, R. [1813], Tanzania Tylophora tridactylata 3784.000 holotype
Jan 1, 2008 Luke, W.R.Q. [11234], Tanzania Tylophora tridactylata K000469045

First published in Phytotaxa 369: 166 (2018)

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.

Literature

Kew Backbone Distributions

  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens

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