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This species is accepted, and its native range is N. Madagascar (Mt. Tsaratanana).
A specimen from Kew's Herbarium

[KBu]

Wilkin, P., Andrianantenaina, W.P. et al. (2008). The species of Dioscorea L. (Dioscoreaceae) from Madagascar with campanulate tori, including a new species from Eastern Madagascar. Kew Bulletin 63: 583. https://doi.org/10.1007/s12225-008-9079-x

Conservation
Data Deficient (DD) (IUCN 2001). This species appears to be restricted to high altitude forest on Mt Tsaratanana above 1300 m but further study is necessary.
Distribution
Endemic to Mt Tsaratanana.
Ecology
Humid evergreen forest; 1300 – 1400 m a.s.l.
Morphology General Habit
A robust twining forest vine to at least c. 20 m, stems annual from a fleshy tuber
Morphology General Indumentum
Indumentum of simple, unmodified, colourless hairs, 0.15 – 0.4 mm long, sparsely present on pedicels and torus, especially in bud, and around the nodes, especially on younger tissues, more densely on the ovaries of female plants
Morphology Leaves
Leaves alternate, blade 6.5 – 14.5 × 3.2 – 10.7 cm, ovate to narrowly so or ovate-oblong, thickly chartaceous, dark green above, paler below, margins entire, base cordate, sometimes weakly auriculate in vegetative stem leaves, sinus 5 – 21 mm deep, apex acuminate, abruptly differentiated from blade, 8 – 18 mm long, with a 2.5 – 6 mm long, deltoid forerunner tip, veins to the apex 5 – 7, with a smaller, often bifid pair to the base, primary veins prominent on lower leaf blade surfaces; petiole 1.9 – 8.3 cm long, terete but channelled on upper surface, two recurved lateral nodal spines (“stipules” of Burkill (1960) present on either side of node at amplexicaul petiole base, 2 – 3 mm long
Morphology Reproductive morphology Flowers
Male flowers purple, scent not recorded, pedicellate, pedicels 3.6 – 6.8 × 0.6 – 1.2 mm, orientated downwards at an angle of c. 30° – 60° to axis at anthesis, in outline linear at base and obdeltoid towards apex, ridged, each pedicel with a basal floral bract 1.6 – 2.3 × 0.6 – 1.3 mm, ovate to elliptic, long-acuminate, membranous, with a thickened midrib; bracteole inserted at c. 90° to it; tepals in two whorls of three, the whorls only slightly differentiated, with the outer whorl being longer and broader than the inner, free or slightly fused at the base where they overlap, thick and only translucent at the margin, inserted on a cup-shaped, torus 1 – 1.7 × 1.3 – 1.8 mm, usually with a clear apical constriction when viewed from the outside, walls thick so that inside of cup has small diam. and filaments are short; tepals chartaceous, reflexed at anthesis, outer tepals 1.5 – 2.5 × 0.9 – 1.7 mm, elliptic to ovate or broadly so, apex obtuse to acute or rarely apiculate, inner tepals 1.3 – 1.9 × 0.9 – 1.6 mm, elliptic to ovate, apex obtuse to rounded; stamens inserted towards centre of torus, filaments 0.6 – 1 mm long, filiform, approximately basal 1/4 free, incurved, above fused to form an erect column, anthers 0.25 – 4 × 0.15 – 0.25 mm, oblong-elliptic in outline, dorsifixed and held in an erect to ascending dense ring, not recurved or spreading, yellow; pistillode three small contingent fleshy projections concealed by filament bases Female flowers on 1 – 1.7 mm long pedicels, pendent in bud, when receptive at an angle of c. 30° to axis, scent not recorded; floral bracts 2.3 – 3.1 × 0.7 – 1.6 mm, ovate to elliptic or narrowly so, long-acuminate, membranous, bracteole like bract but smaller; ovary c. 6.9 – 8.7 mm long, 3-angled in cross-section, very narrowly oblong to oblong-elliptic in outline, narrowing at the apex into a stout, terete floral stipe bearing the torus, 0.5 – 0.9 × 0.9 – 1.7 mm, shallowly bowl-shaped, thick-walled; tepals 6, inserted on the torus rim, free or fused at the base, not differentiated into 2 whorls, 1.5 – 2.2 × 0.9 – 1.5 mm, ovate to very broadly elliptic, apex obtuse to acute, recurved when stigma is receptive; staminodia 6, inserted on torus surface, 0.15 – 0.25 mm long, staminiform; styles 3, 0.5 – 1 mm long, fused at base into a column for about 1/2 of their length, divergent and recurved above, stigmatic surfaces bifid, divergent, both lobes acuminate, appearing obovate and retuse when seen from above
Morphology Reproductive morphology Fruits
Capsules 37 – 54 × 21 – 26 mm, ascending at c. 30° to axis at dehiscence on a recurved, clavate in outline, 3-angled, 4.4 – 6 (– 7) mm long pedicel, oblong in outline, not broadening towards apex, base truncate to rounded, apex rounded to acute, pale brown with darker spots and flecking, especially towards margins, styles persistent as an apiculus on each lobe of capsule, apical part only opening to expose seed (but not fully mature)
Morphology Reproductive morphology Inflorescences
Inflorescences 1 per axil, simple, racemose, pendent Male inflorescence axis 6.6 – 17 cm long (including 0.6 – 1.9 cm long peduncle), thick and strongly winged, width not less than 1.2 mm even at apex, to at least 2.5 mm, flowers solitary, relatively lax Female inflorescences to at least 35 cm long, axes thick and winged like male inflorescences and also exceeding 1.2 mm in width even at the apices
Morphology Reproductive morphology Seeds
Seeds winged at base only, only very immature seeds seen, dark brown, wing not yet formed.
Morphology Stem
Stems left-twining, to at least 6 mm in diam., terete, with weak ridges and prickles towards the base, a few cataphylls present towards stem base, to 9 mm long, ovate, acuminate, dry and rigid; bulbils not present
Type
Antsiranana Prefecture, Tsaratanana, ♂ fl. & ♀ fr. Jan. 1923, Perrier 15248 (lectotype K!, selected here; isolectotypes K!, P!).
Vegetative Multiplication Tubers
Tubers (description based solely on Perrier 15248bis), paired, deeply buried, on a long underground stem with several underground nodes bearing roots, crown woody and growing to 10 – 20 cm in diam. according to Burkill & Perrier (1950)
Vernacular
Ovihotra, Ovifotsy (Sakalava, Mt Tsaratanana).

[KBu]
Use
Tuber edible (cooked).

Native to:

Madagascar

Dioscorea tsaratananensis H.Perrier appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Perrier de la Bâthie, J.M.H.A. [15248bis], Madagascar K000098963 syntype
Perrier de la Bâthie, J.M.H.A. [15248], Madagascar K000099027 isosyntype
Perrier de la Bâthie, J.M.H.A. [15248], Madagascar K000099028 isosyntype
Perrier de la Bâthie, J.M.H.A. [15248], Madagascar K000099029 isosyntype
Perrier de la Bâthie, J.M.H.A. [15248], Madagascar K000099030 isosyntype

First published in Mém. Soc. Linn. Normandie, Bot. 1(1): 20 (1928)

Accepted by

  • Govaerts, R. (2000). World Checklist of Seed Plants Database in ACCESS D: 1-30141.
  • Govaerts, R., Wilkin, P. & Saunders, R.M.K. (2007). World Checklist of Dioscoreales. Yams and their allies: 1-65. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Wilkin, P., Andrianantenaina, W.P., Jeannoda, V. & Hladik, A. (2008 publ. 2009). The species of Dioscorea L. (Dioscoreaceae) from Madagascar with campanulate tori, including a new species from Eastern Madagascar Kew Bulletin 63: 583-600.

Literature

Kew Backbone Distributions

  • Wilkin, P., Andrianantenaina, W.P., Jeannoda, V. & Hladik, A. (2008 publ. 2009). The species of Dioscorea L. (Dioscoreaceae) from Madagascar with campanulate tori, including a new species from Eastern Madagascar Kew Bulletin 63: 583-600.

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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 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