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This species is accepted, and its native range is Bolivia.


Goyder, D., & J. Fontella-Pereira. (2005). Notes on Oxypetalum R. Br. (Apocynaceae: Asclepiadoideae) in Bolivia and Peru. Kew Bulletin, 60(1), 95-101. Retrieved from

Data Deficient. The species may be under-collected.
Only known from three Bolivian collections from Beni and western Santa Cruz.
Disturbed forest at c. 300 - 500 m.
Morphology General Habit
Perennial herbaceous vine with twining stems
Morphology Leaves
Leaves with petiole 1.5 - 2 cm long, densely pubescent; lamina 5 - 7 x 3 - 4 cm, broadly ovate, apex attenuate, base deeply cordate with rounded basal auricles, pubescent on both surfaces but more densely beneath, young leaves densely pubescent
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings c. 1 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx lobes 2 - 3 mm long, linear to narrowly triangular, densely pubescent
Morphology Reproductive morphology Flowers Corolla
Corolla campanulate, greenish cream or dull purple, tube 2 - 3 mm long, densely pubescent outside, inside bearded below, glabrous above; lobes 3 - 4 x 1 mm, oblong or ovate, acute, spreading, densely pubescent abaxially, adaxial face glabrous
Morphology Reproductive morphology Flowers Corona
Corona gynostegial in origin, but fused to both the base of the staminal column and the lower part of the corolla tube, lobes short, triangular
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head extending c. 3 mm beyond the anthers, with paired appendages.
Morphology Reproductive morphology Flowers Pollinarium
Corpusculum c. 0.7 x 0.15 mm, flattened, brown; translator arms c. 0.2 mm long, flattened, c. 0.2 mm broad, and with a slender tooth; pollinia c. 0.5 x 0.15 mm, subcylindrical
Morphology Reproductive morphology Inflorescences
Inflorescences extra-axillary, subsessile, with 2 - 5 flowers; pedicels 3 - 5 mm long, densely pubescent
Morphology Stem
Stems pubescent with short spreading white hairs
Oxypetalum pearsonii appears close to O. brachystemma, but differs in a number of characters: the corolla tube is bearded lower down, the indumentum not extending to the throat or lobes; the inflorescences are subsessile and few-flowered, rather than pedunculate and many-flowered; and the stylar head appendages are much shorter and more clearly bilobed. It differs from O. fuscum in that the stylar head is not thickened or fleshy and the leaves have a deep basal sinus.
It appears to flower in the dry season - two of the three collections were made in July and August.
Bolivia, Beni, Rurrenabaque, 1000 ft, 9 Jan. 1922, Cárdenas 2035 (holotype NY, n.v.; isotypes GH, US).

Native to:


Oxypetalum pearsonii (Rusby) Goyder & Fontella appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jul 27, 2005 Wood, J.R.I. [12547], Bolivia 61535.000
Jan 1, 2005 Wood, J.R.I. [12465], Bolivia 74203.000

First published in Kew Bull. 60: 99 (2005)

Accepted by

  • Farinaccio, M.A. & Goyder, D. (2016). A synopsis of Oxypetalum (Apocynaceae) in Bolivia, with the description of one new species and a key to species in Bolivia Phytotaxa 267: 16-28.


Kew Bulletin

  • --- & Schwarz, E. de A. (1981). Contribuição ao estudo das Asclepiadaceae Brasileiras, XVI. Novos sinônimos e uma nova combinação. Bradea 3 (22): 159-163.
  • ---, Hatschbach, G. & Hartmann, R. W. (1985). Contribuição ao estudo das Asclepiadaceae do Paraná III. Notas preliminares. Bol. Mus. Bot. Mun. Curitiba 64: 1 - 47.
  • ---, Valente, M. da C, Marquete, N. F. da S. & Ichaso, C. L. F. (2004). Apocináceae-Asclepiadoideas. In: R. Reitz & A. Reis (eds.), Flora Ilustrada Catarinense, Monografia - Asclepiadáceas, 1 - 250.
  • Dorr, L. J. (1992). The vascular plant collections of R. S. Williams from Bolivia and Peru (1901 - 1902). Brittonia 43: 211-239.
  • Dubs, B. (1998). Prodromus florae Matogrossensis, part I. Checklist of Angiosperms, part II. Types from Mato Grosso. Betrona-Verlag.
  • Ezcurra, C. (1999). Asclepiadaceae. In: F. O. Zuloaga & O. Morrone (eds), Catálogo de las plantas vasculares de la República Argentina II: 78 - 98. Missouri Botanical Garden Press.
  • Fontella-Pereira, J., Goyder, D. J. & Marquete F. da Silva, N. (2005). Infraspecific variation in Oxypetalum cordifolium (Vent.) Schltr. (Apocynaceae- Asdepiadoideae). Kew Bull. 60: 103 - 109.
  • Goyder, D. J. (2004a). The identities of Corollonema Schltr., Dactylostelma Schltr. and Metoxypetalum Morillo (Apocynaceaer. Asclepiadoideae). Kew Bull. 59: 301 - 303.
  • Lillo, M. (1919). Las Asclepiadáceas argentinas. Physis (Buenos Aires) 4: 410 - 437.
  • Malme, G. O. A. (1900). Die Asclepiadaceen des Regnell'schen Herbars. Kongl. Svenska Vetensk. Acad. Handl. 34 (7): 1-101.
  • Meyer, T. (1943). Revisión de las especies Argentinas del género Oxypetalum (Asclepiadaceae). Lilloa 9: 5 -72.
  • Navarro, G. (2002). Provincia biogeográfica Boliviano-Tucumana. In: G. Navarro & M. Maldonado, Geografía ecológica de Bolivia: vegetación y ambientes acuáticos: 349-451. Centro de Ecología Simón I. Patiño, Cochabamba.
  • Occhioni, P. (1971). Duas novas especies de Oxypetalum para a flora do Brasil. Leandra 1(1): 7 - 11.
  • Rivas-Martínez, S. & Navarro, G. (2002). Mapa biogeográfico de América del Sur. In: G. Navarro & M. Maldonado, Geografía ecológica de Bolivia: vegetación y ambientes acuáticos. Fig. I. 14, pp. 42 - 43. Centro de Ecología Simón I. Patiño, Cochabamba.
  • Rusby, H. H. (1912). New species from Bolivia, collected by R. S. Williams - 2. Bull. New York Bot. Gard. 8:89-135.
  • Schlechter, R. (1906). Asclepiadaceae andinae. In: I. Urban, Plantae novae andinae imprimir Weberbauerianae. II. Bot. Jahrb. Syst. 37: 601 - 627.
  • — (1927). Descriptions of new genera and species of plants collected on the Mulford Biological Exploration of the Amazon Valley, 1921 - 1922. Mem. New York Bot. Gard. 7: 205 - 387.
  • — (1944). Asclepiadaceae. In: H. R. Descole (ed.), Genera et species plantarum argentinarum 2: 1 - 273 & 121 plates.
  • — (1957). Contribuciones a la flora fanerogamica Argentina. I. Dos arboles nuevos para la flora Argentina. Bol. Soc. Argent. Bot. 7: 12-16.
  • — (2004b). An amplified concept of Philibertia Kunth (Apocynaceae: Asclepiadoideae), with a synopsis of the genus. Kew Bull. 59: 415 - 451.

Herbarium Catalogue Specimens

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 World Checklist of Selected Plant Families.

Kew Bulletin
Kew Bulletin

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.