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This species is accepted, and its native range is Tanzania to S. Africa.
A specimen from Kew's Herbarium

[KBu]

P. Siro Masinde. (2005). A Revision of the African Genus Riocreuxia Decne. (Apocynaceae: Asclepiadoideae-Ceropegieae). Kew Bulletin, 60(3), 401-434. Retrieved from http://www.jstor.org/stable/4111063

Cytology
Chromosome number 2n = 22 (Albers & Meve 2001).
Distribution
Rwanda, Burundi, Tanzania, Malawi, Zambia, Zimbabwe, Angola, South Africa, Swaziland, Lesotho
Ecology
Forest margins, including montane and riverine forests, wooded savannas and thickets; 0- 1800 m
Morphology General Habit
A sparsely hairy, leafy climber, 1 - 3 m or more high
Morphology Leaves
Leaves herbaceous, spreading; petiole (10 -)30 - 60(- 90) mm long, terete, pubescent all around; lamina 30 - 90(-135) x 20 - 80(- 180) mm, ovate or elliptic-ovate, base deeply cordate, apex acuminate, occasionally acute; with a broad subtruncate sinus between the semiorbicular incurved or overlapping basal lobes; sparsely and rather minutely pubescent on both sides or rarely glabrous above, veins especially on lower surface more densely pubescent, margin entire, ciliolate
Morphology Reproductive morphology Flowers Calyx
Sepals linear-subulate or lanceolate, acute, 2.5(- 4) x 0.5(- 0.7) mm at base, often apically reflexed, glabrous
Morphology Reproductive morphology Flowers Corolla
Corolla (13 -) 16(- 28) mm long, straight; tube subcylindric or slightly inflated towards base, 10 - 14 mm long x 3 - 4 (- 5) mm diam.; exterior and interior whitish/yellowish/ cream/pale green occasionally with faint greenish striations, glabrous throughout; lobes linear- lanceolate, attenuate-acute, 4 - 8(- 13) x 1 - 1.8(- 2.5) mm wide at base, erect, connate at apex to form an ellipsoid or subglobose cage-like structure 5 (- 8) mm diam., occasionally breaking free, sometimes orange-red/yellow or pale yellow which is usually more intense adaxially, glabrous
Morphology Reproductive morphology Flowers Corona
Corona ± subglobose, c. 1.5 x 1.5 mm, subsessile or shortly stipitate, biseriate, apparently cream or yellowish, glabrous throughout; outer lobes ± forming 5 small pockets, emarginate or shortly bifid, with c. 0.5 mm long subhorizontally orientated teeth or lobules somewhat appearing face-to-face; inner lobes dorsiventrally compressed, linear-obtuse, 0.5 - 1.2 x c. 0.3 mm, slightly longer or slightly shorter than anthers, closely applied to their backs and connivent over them; guide rails c. 300 μm long
Morphology Reproductive morphology Flowers Gynoecium Carpels
Carpels glabrous
Morphology Reproductive morphology Flowers Pollinarium
Pollinia 280 - 400 x 150 - 200 μm, elliptic-oblong with an acute pellucid margin at apex; corpusculum elliptic, 120 - 190 x 70 - 80 μm
Morphology Reproductive morphology Fruits
Follicles paired, acutely divergent, cylindrical, apically tapering, (90 -)150 - 170(- 210) x 2 - 4 mm diam. at centre; no distinct constrictions between seeds; seed dorsiventrally compressed, oblong-elliptic, 8 - 10 x c. 2.5 mm, dark brown or blackish with a c. 0.5 mm wide paler margin; coma c. 20 mm long
Morphology Reproductive morphology Inflorescences
Inflorescence of long, slender, branched, paniculate cymes up to 170 mm long; bracts linear-subulate, c. 2 mm long, glabrous; peduncle 1- 2 mm diam., unifariously puberulous, branching at the node or at a distance into up to 4 branches, each branch in turn mostly dichotomously or trichotomously branching once or twice to produce the profusely flowering terminals; pseudoumbels 10 - 30+ -flowered; flower- buds cylindric, attenuate-acute, often slightly twisted clockwise in apical half; many flowers opening simultaneously; pedicels (15 -) 20 - 35 mm, long and slender, glabrous
Morphology Stem
Stem annual, twining, freely branching, stout in older parts; nodes with a distinct ring of simple, minute (c. 0.6 mm long) whitish-translucent multicellular hairs; internodes 40 - 270 mm long, 1.5 - 4(- 7) mm diam., mostly unifariously puberulous, sometimes bifarious, hairs minute, simple, whitish-translucent, reflexed
Note
Schlechter 6291 is represented at K with two sheets, one of them stamped 17 Jan. 1905 and the second 5 Dec. 1910. They are all good specimens and identical but the one with an earlier date stamp was seen and authenticated by N. E. Brown for Flora Capensis and hence it is here chosen as the lectotype. The oldest name for this taxon is Riocreuxia polyantha Schltr. (Sept. 1895) but it is better known as R. burchellii K. Schum. (Oct. 1895) R. polyantha is taken as the correct name following the priority rule. It is very similar to R. splendida in vegetative, corolla and corona characters, and the two appear to be closely related. It is probably also closely related to R. torulosa, Riocreuxia polyantha is widespread and relatively well collected. Some populations have flowers with more conspicuous orange lobes than others. The basic corona form is fairly uniform with the main variation being in the length of the staminal (inner) corona lobes. They are either slightly shorter than the anthers in which case they are also shorter than the stylar head or slightly longer than the anthers and just overtopped by the stylar head or just overtopping the stylar head and lying on top, sometimes with the lobe apices almost touching It is probable that there is natural hybridisation of this species with R. picta and R. torulosa since there are a number of morphologically intermediate specimens (cf. picta and R. torulosa since there are a number of morphologically intermediate specimens (cf. Dyer 1980). The distribution of R. polyantha overlaps with these two species in some areas of South Africa
Phenology
Flowering December - May with peaks from March to April in East and South East Africa; September - April with peaks from January - February in southern Africa.
Type
South Africa, Transkei, near Bashee R., Jan. 1895, Schlechter 6291 (B†, holotype; K!, sheet stamped 17 Jan. 1905; K!, PRE, isolectotypes).

[FTEA]

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

Morphology Leaves
Leafy climber, 1–3 m or more high, sparsely hairy; stem annual, twining, freely branching, stout in older parts; nodes with a distinct ring of simple, ± 0.6 mm long whitish-translucent hairs; mostly unifariously puberulous, sometimes bifarious, with minute reflexed hairs Leaves herbaceous, spreading; petiole (10–)30–60(–90) mm long, pubescent; lamina ovate or elliptic-ovate, 3–9(–13.5) × 2–8(–18) cm, base deeply cordate, apex acuminate, occasionally acute; with a broad subtruncate sinus between the semiorbicular incurved or overlapping basal lobes; sparsely and rather minutely pubescent on both sides or rarely glabrous above, veins especially on lower surface more densely pubescent, margin ciliolate. Inflorescence of long, slender, branched, paniculate cymes up to 170 mm long; peduncle 1–2 mm diameter, unifariously puberulous, branching into up to 4 branches, each branch in turn mostly dichotomously or trichotomously branching once or twice; pseudoumbels 10–30+-flowered; bracts linear-subulate, ± 2 mm long, glabrous; flower-buds cylindric, attenuate-acute, often slightly twisted clockwise in apical half; many flowers opening simultaneously; pedicels (15–)20–35 mm, glabrous
Morphology Reproductive morphology Flowers Calyx
Sepals linear-subulate or lanceolate, 2.5(–4) × 0.5(–0.7) mm, acute, often apically reflexed, glabrous
Morphology Reproductive morphology Flowers Corolla
Corolla (13–)16(–28) mm long, straight; tube subcylindric or slightly inflated towards base, 10–14 mm long × 3–4(–5) mm diameter; exterior and interior whitish/yellowish/cream/pale green occasionally with faint greenish striations, glabrous throughout; lobes erect, linear-lanceolate, 4–8(–13) × 1–1.8(–2.5) mm, attenuate-acute, connate at apex to form an ellipsoid or subglobose cage-like structure 5(–8) mm diameter, occasionally breaking free, sometimes orangered/yellow or pale yellow which is usually more intense adaxially, glabrous
Morphology Reproductive morphology Flowers Corona
Corona apparently cream or yellowish, ± subglobose, ± 1.5 × 1.5 mm, subsessile or shortly stipitate, biseriate, glabrous throughout; outer lobes ± forming 5 small pockets, emarginate or shortly bifid, with ± 0.5 mm long subhorizontally orientated teeth or lobules somewhat appearing face-to-face; inner lobes linear-obtuse, 0.5–1.2 × ± 0.3 mm, slightly longer or slightly shorter than anthers, closely applied to their backs and connivent over them; guide rails ± 300 mm long.
Morphology Reproductive morphology Flowers Pollinia
Pollinia elliptic-oblong, 0.28–0.4 × 0.15–0.2 mm; corpusculum elliptic, 0.12–0.19 × 0.07–0.08 mm
Morphology Reproductive morphology Flowers Gynoecium Carpels
Carpels glabrous
Morphology Reproductive morphology Fruits
Follicles paired, acutely divergent, cylindrical, (90–)150–170(–210) × 2–4 mm diameter at centre, apically tapering; no distinct constrictions between seeds
Morphology Reproductive morphology Seeds
Seed dark brown or blackish, oblong-elliptic, 8–10 × ± 2.5 mm, dorsiventrally compressed, with a ± 0.5 mm wide paler margin; coma ± 20 mm long
Figures
Fig 65, p 217
Ecology
Forest margins (including montane and riverine forest), wooded grassland and thickets; 350–1200 m
Note
Very similar to R. splendida in vegetative, corolla and corona characters, and the two appear to be closely related; occasionally cultivated.
Distribution
Range: Rwanda, Burundi, Angola, Zambia, Malawi, Zimbabwe, Swaziland, Lesotho, South Africa Flora districts: T4 T6 T7 T8

Native to:

Angola, Burundi, Cape Provinces, Free State, KwaZulu-Natal, Lesotho, Malawi, Northern Provinces, Rwanda, Swaziland, Tanzania, Zambia, Zimbabwe

Riocreuxia polyantha Schltr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Buchanan [205], Malawi K000305550 syntype
Buchanan, J. [455], Malawi K000305549 syntype
Schlechter, F.R.R. [6291], South Africa K000305700 Unknown type material
Schlechter, F.R.R. [6291], South Africa K000305701 Unknown type material
Oct 1, 2001 Milne-Redhead, E. [9781], Tanzania Riocreuxia burchellii 1032.000
Oct 1, 2001 Bridson, D. [294], Rwanda Riocreuxia burchellii 41492.000
Jan 1, 1978 Burchell, W.J. [2668], South Africa Riocreuxia burchellii K000305703 Unknown type material
South Africa Riocreuxia burchellii 59155.000
Barber [3], South Africa Riocreuxia burchellii K000305702

First published in J. Bot. 33: 273 (1895)

Accepted by

  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Goyder, D.J., Gilbert, M.G. & Venter, H.J.T. (2020). Flora Zambesiaca 7(3): 1-375. Royal Botanic Gardens, Kew.
  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.

Literature

Kew Backbone Distributions

  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa an annotated checklist Strelitzia 14: 1-1231. National Botanical Institute, Pretoria.
  • 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

  • Fl. Cap. 4(1): 801 (1908)
  • Fl. Pl. S. Afr. 29: t. 1124 (1953)
  • J.B. 33: 272 (Sep. 1895)
  • K.B. 60: 412, fig. 1 (2005).

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

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