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This species is accepted, and its native range is SW. Tanzania to N. Malawi.
A specimen from Kew's Herbarium

[FTEA]

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

Morphology General Habit
Climber 1–3 m high, hairy, leafy.
Morphology Stem
Stem twining, branched, stout in older parts, pubescent all round, dry stems hollow; nodes with indistinct ring of ± 0.5 mm long brownish-translucent hairs
Morphology Leaves
Leaves herbaceous, spreading; petiole (10–)20–50 mm long, terete, pubescent all around but more so in adaxial channel; lamina ovate or elliptic-ovate, (18–)40–75 × (13–)35–50 mm, base deeply or shallowly cordate, apex acuminate or acute; deeply cordate leaves with a broad subtruncate sinus between the semi-orbicular incurved or overlapping basal lobes; upper surface sparsely pubescent to ± glabrous, lower surface minutely velvety pubescent especially along veins; margin ciliolate 2.5–4 × 1–1.5 mm, acute or obtuse, apically free
Morphology Reproductive morphology Inflorescences
Inflorescence of short, pedunculate cymes up to 80 mm long; peduncle ± 0.5 mm diameter, pubescent all round, branched into 2 or 3 and then producing the umbellate cymes or dichotomously branching once before producing flowers; pseudoumbels up to 10-flowered, many flowers opening simultaneously.
Morphology Reproductive morphology Inflorescences Bracts
Bracts subulate, ± 1.5 mm long, glabrous.
Morphology Reproductive morphology Flowers Pedicel
Pedicels 5–10 mm, densely pubescent all round
Morphology Reproductive morphology Flowers Calyx
Sepals linear-subulate/lanceolate, ± 1.5–2 × 0.6 mm, almost glabrous except for some pubescence at the bases
Morphology Reproductive morphology Flowers Corolla
Corolla straight, bell-shaped, 7–10 mm long, glabrous throughout; tube bell-shaped, 3–5.5 mm long × ± 4 mm diameter in middle, mostly slightly longer than lobes; exterior and interior cream/whitish-yellow, glabrous throughout; lobes spreading, deep orange-red adaxially, deltoid-linear,
Morphology Reproductive morphology Flowers Corona
Corona elongate or ± subglobose, 1.8–2 × 1.8 mm, shortly stipitate, biseriate, glabrous throughout; outer lobes forming 5 small pockets, deltoid-oblong, emarginate, teeth erect, ± 0.2 mm long; inner lobes erect-connivent, linear-obtuse, ± 1 × 0.2 mm, slightly or much longer than anthers, closely applied to their backs and connivent over them; guide rails ± 0.25 mm long
Morphology Reproductive morphology Flowers Pollinia
Pollinia elliptic-oblong, ± 0.35 × 0.15 mm; corpusculum elliptic, ± 0.15 × 0.07 mm
Morphology Reproductive morphology Flowers Gynoecium Carpels
Carpels glabrous
Morphology Reproductive morphology Fruits
Follicles and seed unknown.
Ecology
Montane forest margins and bushland; 2100–2450 m
Note
SYN. Ceropegia chrysochroma H. Huber in Mem. Soc. Brot. 12: 203 (1958) Rare; probably closely related to R. splendida.
Distribution
Flora districts: T7 Range: Malawi

[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

Distribution
Tanzania, Malawi.
Ecology
Montane forest margins and bushland; altitude, 2100 - 2450 m.
Morphology General Habit
A hairy leafy climber, 1 - 3 m high
Morphology Leaves
Leaves herbaceous, spreading; petiole (10 -) 20 - 50 mm long, terete, pubescent all around but more so in adaxial channel; lamina (18 -) 40 - 75 x (13 -) 35 - 50 mm, ovate or elliptic-ovate, base deeply or shallowly cordate, apex acuminate or acute; deeply cordate leaves with a broad subtruncate sinus between the semi-orbicular incurved or overlapping basal lobes; upper surface sparsely pubescent to more or less glabrous, lower surface minutely velvety pubescent especially along veins; margin entire, ciliolate
Morphology Reproductive morphology Flowers Calyx
Sepals linear-subulate/lanceolate, c. 1.5 - 2 x 0.6 mm at base, almost glabrous except for some pubescence at the bases
Morphology Reproductive morphology Flowers Corolla
Corolla bell-shaped, 7 - 10 mm long, straight, glabrous throughout; tube bell- shaped, 3 - 5.5 mm long x c. 4 mm diam. in middle, mostly slightly longer than lobes; exterior and interior cream/whitish-yellow, glabrous throughout; lobes deltoid-linear, acute or obtuse, 2.5 - 4 x 1 - 1.5 mm wide at base, spreading, apically free, deep orange-red adaxially
Morphology Reproductive morphology Flowers Corona
Corona elongate or ± subglobose, c. 1.8 - 2 x 1.8 mm, shortly stipitate, biseriate, glabrous throughout; outer lobes forming 5 small pockets, deltoid-oblong, emarginate, teeth c. 0.2 mm long, erect; inner lobes dorsiventrally compressed, linear-obtuse, erect-connivent, c. 1 x 0.2 mm, slightly or much longer than anthers, closely applied to their backs and connivent over them; guide rails c. 250 μm long
Morphology Reproductive morphology Flowers Gynoecium Carpels
Carpels glabrous.
Morphology Reproductive morphology Flowers Pollinarium
Pollinia c. 350 x 150 μm, elliptic-oblong with an acute pellucid margin at apex; corpusculum elliptic, c. 150 x 70 μm
Morphology Reproductive morphology Inflorescences
Inflorescence of short, pedunculate cymes up to 80 mm long; bracts subulate, c. 1.5 mm long, glabrous; peduncle c. 0.5 mm diam., pubescent all round, branched at the node into 2 or 3 peduncles and then producing the umbellate cymes or dichotomously branching once before producing flowers; pseudoumbels up to 10-flowered, many flowers opening simultaneously; pedicels 5 - 10 mm, c. 0.4 mm diam., long and slender, densely pubescent all round
Morphology Stem
Stem twining, branched, stout in older parts, dry stems hollow; nodes with indistinct ring of simple, minute (c. 0.5 mm long) brownish-translucent multicellular hairs; internodes 50 - 200 mm long, (1 -) 2 - 4 mm diam., pubescent all round
Note
Riocreuxia chrysochroma is readily distinguishable by its twining habit accompanied with campanulate flowers. In dried specimens, almost all mature flowers have free corolla lobes which are often reflexed. The peduncles are not branched and are very close to the nodes. The flowers are rather small and crowded. The campanulate corolla seems to be the only important character that links this species with the South African R. aberrans. The differences in habit, corona and pollinia morphology suggest that the two may not be closely related. Its habit as well as the general morphology of the corolla, corona and pollinia suggests a close relationship with R. splendida. The corolla of R. chrysochroma resembles species of the ditypic South African genus Anisotoma Fenzl., A. cordifolia Fenzl. and A. pedunculata N. E. Br., but this resemblance may only be superficial.
Phenology
Flowering November - March.
Type
Tanzania, Njombe Distr. Elton [Kitulo] Plateau, Nyarere R., 8 Jan. 1957, Richards 7594 (K!, holotype).

Native to:

Malawi, Tanzania

Riocreuxia chrysochroma (H.Huber) Radcl.-Sm. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Mar 1, 1960 Richards, H.M. [7594], Tanzania K000305551 Unknown type material

First published in Kew Bull. 21: 298 (1967)

Accepted by

  • 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

  • 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

  • K.B. 21: 298 (1967)
  • K.B. 60: 427, fig. 7 (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