Skip to main content
This species is accepted, and its native range is Mpumalanga.
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

Distribution
South Africa, endemic to the eastern Transvaal highveld.
Ecology
Exposed quartzite ridges; altitude, c. 1900 m.
Morphology General Habit
A sparsely hairy, leafy, erect or ascending, tufted herb to 1 m high
Morphology Leaves
Leaves herbaceous, spreading; petiole (8 -) 20 - 40 mm long, terete, pubescent within and along rims of adaxial channel, with orange-brown glands on adaxial side where the lamina joins the petiole; lamina (15 -) 30 - 60 (- 70) x 20 - 60(- 70) mm, broadly ovate, base deeply cordate, apex shortly acuminate or acute; with a broad subtruncate sinus between the semiorbicular incurved or overlapping basal lobes; sparsely and rather minutely pubescent on both sides or glabrous, margin entire, ciliolate
Morphology Reproductive morphology Flowers Calyx
Sepals linear- lanceolate, 3 - 4 x 0.7 - 1 mm at base, glabrous or sparsely pubescent
Morphology Reproductive morphology Flowers Corolla
Corolla (11 -) 15 - 20 mm long, straight, glabrous throughout; tube campanulate, 4 - 5 mm long x 5 - 7 mm diam.; exterior cream, interior greenish-cream; lobes linear-lanceolate, (7 -)8 - 15 x 2 - 3 mm wide at base, mostly free, occasionally connate at apex to form a globose cage-like structure
Morphology Reproductive morphology Flowers Corona
Corona ± oblong-elliptic, c. 1.6 x 1.2 mm, shortly stipitate, biseriate but appearing ± uniseriate, yellowish, glabrous throughout; outer lobes forming very short open pockets between the inner lobes and confluent with them, emarginate with margins of notch somewhat thickened and recurved to give a V- shape at centre with 'teeth'/lobules ± face-to-face; inner lobes incumbent erect over the staminal column, dorsiventrally compressed, linear-oblong, c. 1.3 x 0.2 mm in middle, apex obtuse or emarginate, only closely applied to backs of anthers in basal area; guide rails c. 200 μm long, well exposed
Morphology Reproductive morphology Flowers Gynoecium Carpels
Carpels glabrous
Morphology Reproductive morphology Flowers Pollinarium
Pollinia c. 300 x 240 μm, oblong with a truncate pellucid crest extending across whole breadth of pollinium hence giving them a distinct D-shape; corpusclum linear without distinct slit at base, c. 210 x 70 μm; caudicles arising from base of corpusculum and attached to bases of the ventral sides of pollinia
Morphology Reproductive morphology Fruits
Follicles paired acutely divergent, cylindrical, apically tapering, 75 - 100 x 3 - 4 mm diam. at centre with slight constrictions at intervals of 5 - 7 mm when mature; seed dorsiventrally compressed, elliptic-oblong, c. 7 x 2 mm, dark brown or blackish with a c. 0.3 mm wide paler margin; coma c. 17 mm long.
Morphology Reproductive morphology Inflorescences
Inflorescence of short, unbranched, mostly sessile or subsessile umbellate cymes up to 30 mm long, sometimes one peduncle produced and a second subsessile one from the same point; bracts linear-subulate, 1.5 - 2 mm long, ± glabrous; peduncle 0- 20 mm long, 1 - 1.5 mm diam., glabrous to sparsely puberulous, pseudoumbels, 3-6(- 10)-flowered; in bud, flowers cylindric, attenuate-acute, convolute in apical half; pedicels 5 - 10(- 15) mm, long, slender, glabrous
Morphology Stem
Stem sparsely branching, stout in older parts, dry stems hollow at centre; nodes with a distinct ring of long whitish/brownish-translucent multicellular hairs; internodes 40 - 70(- 125) mm long, 1.5 - 5 mm diam., unifariously puberulous, hairs minute, simple, whitish-translucent, reflexed
Note
Riocreuxia aberrans is distinct from the rest of the Riocreuxia species in its erect habit accompanied by campanulate flowers. Before Dyer (1957) described this species as a Riocreuxia, he contemplated erecting a new genus. The general vegetative and floral characters, except for the growth habit and pollinia morphology, support its inclusion in Riocreuxia. The morphology of the corona and the disposition of the inflorescence suggests that it is probably related to R. flanaganii, albeit distantly. The important characters shared by the two species are: the mostly sessile or subsessile inflorescences which are occasionally shortly pedunculate (often mixtures of sessile and pedunculate inflorescences on the same shoot), the congested pseudoumbels, and the shape and disposition of the outer corona lobes. The flowers of this species are about twice as large as those of R. flanaganii. The campanulate corolla makes it resemble R. chrysochroma but as discussed earlier under that species, this does not seem to point to a close relationship. In dried specimens, almost all flowers appear to have free and more or less reflexed corolla lobes. However, Dyer, having studied material in cultivation, points out that the plants had a number of flowers with connate corolla lobes.
Phenology
Flowering November -January.
Type
South Africa, Transvaal, Ermelo, Dec. 1932, Walker s.n. in PRE 14397 (PRE, holotype; K! isotype, fragment, pencil sketch and photo).

Native to:

Northern Provinces

Riocreuxia aberrans R.A.Dyer appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Walker, G.F. [s.n.], South Africa K000305694 holotype
Galpin, E.E. [13302], South Africa K000305695 isosyntype

First published in Bothalia 3: 274 (1937)

Accepted by

  • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa an annotated checklist Strelitzia 14: 1-1231. National Botanical Institute, Pretoria.

Literature

Kew Backbone Distributions

  • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa an annotated checklist Strelitzia 14: 1-1231. National Botanical Institute, Pretoria.

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