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


Wood, J.R.I. A synopsis of Stenostephanus Nees (Acanthaceae) in Bolivia. Kew Bulletin 74: 65 doi:10.1007/s12225-019-9844-z

Only known from around the type locality in the Madidi National Park in northern Bolivia.
In open, well drained areas beside the trail in montane Yungas rainforest with Clethra elongata Rusby and Weinmannia reticulata Ruiz & Pav.
Morphology General Habit
Isophyllous, much-branched perennial subshrub, c. 1 m high
Morphology Leaves
Leaves petiolate, 5 – 20 × 2 – 9 cm, oblong-elliptic or (above) elliptic, apex shortly acuminate, base attenuate, margin entire, both surfaces coarsely hirsute, but especially so on the veins, adaxially with cystoliths, abaxially paler, the midrib with prominent cystoliths, reticulate; petiole 0 – 3.5 cm, diminishing in length upwards, hirsute, cystoliths prominent
Morphology Reproductive morphology Flowers Androecium Stamens
Filaments glabrous, c. 18 mm long, anthers 2 mm long, exserted c. 6 mm
Morphology Reproductive morphology Flowers Calyx
Calyx subequally 5-lobed to the base, lobes 7 – 8 mm long at anthesis, lanceolate-narrowly deltoid, finely acuminate, green, hirsute, accrescent in fruit to 12 mm
Morphology Reproductive morphology Flowers Corolla
Corolla glabrous, 14 – 15 mm long, tube yellow, basal subcylindrical part c. 4 mm long, then slightly constricted before being, abruptly widened to 4 – 4.5 mm in width, before being slightly narrowed at the mouth, limb shortly lobed, the lobes 2 × 2 mm, obtuse, greenish when young
Morphology Reproductive morphology Flowers Gynoecium Style
Style 2.2 cm long, appressed pilose
Morphology Reproductive morphology Fruits
Capsule oblanceolate-clavate, c. 12 × 3 mm (somewhat immature), glabrous; seeds not seen.
Morphology Reproductive morphology Inflorescences
Inflorescence a lax terminal thyrse up to 20 cm long with smaller inflorescences developing in the axils of the upper leaves; bracts at inflorescence branching points resembling small leaves, diminishing in size upwards, primary branches up to 3.5 cm long, hirsute; secondary branches 0.5 – 0.8 (– 1.8) cm, hirsute; bracteoles 2 – 4 × 0.1 – 0.5 mm, linear-filiform, hirsute; pedicels 1 mm long, hirsute
Morphology Stem
Stems dark green, terete, densely hirsute with multicellular hairs
Resembling species previously placed in Hansteinia because of the suburceolate corolla with short, subequal lobes and very superficially recalling a yellow-flowered form of S. crenulatus in its diffuse thyrse, but the plant is hirsute (not glabrous) and the calyx lobes lanceolate, 7 – 8 mm long (not deltoid c. 3 mm long) and the corolla yellow (not red); quite unlike the other Bolivian species with a yellow corolla (I. krukoffii and I. spicatus) both of which differ inter alia in the subspicate inflorescence.
Bolivia, La Paz, Prov. Franz Tamayo, P.N. Madidi, sector Tocoaque, por el camino Keara-Mojos, 14°37'05"S 68°57'08"W, 2350 m, 16 April 2016 fl., A. F. Fuentes 19712 (holotype LPB, isotypes K, MO).

Native to:


Stenostephanus madidiensis J.R.I.Wood appears in other Kew resources:

First published in Kew Bull. 74(4)-65: 7 (2019)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8: 215.


Kew Bulletin

  • Baum, V. M. (1982). New species and combinations in Odontonema (Acanthaceae). Brittonia 34: 424 – 434.
  • Daniel, T. (2006). Synchronous flowering and monocarpy suggest plietesial life history for neotropical Stenostephanus chiapensis (Acanthaceae). Proc. Calif. Acad. Sci. 57: 1011 – 1018.
  • Jorgensen, B. M., Nee, M. & Beck, S. G. (2015). Catálogo de las Plantas Vasculares de Bolivia. 2 vols. Missouri Botanical Garden Press, St Louis.
  • Killeen, T. J., Garcia, E. & Beck, S. G. (1993). Guía de Arboles de Bolivia. Herbario Nacional de Bolivia, La Paz & Missouri Botanical Garden, St Louis.
  • Lindau, G. (1895). Acanthaceae Americanae. Bull. Herb. Boissier 3: 479 – 493.
  • Ministerio de Medio Ambiente y Agua (2012). Libro Rojo de la Flora amenazada de Bolivia, Vol. 1. Zona Andina La Paz.
  • Nees von Esenbeck, C. G. (1847). Acanthaceae. In: A. P. de Candolle (ed.), Prodromus systematis naturalis regni vegetabilis 11: 46 – 519. Masson, Paris.
  • Ruiz, H. & Pavon, J. A. (1798). Flora Peruviana et Chilensis Vol. 1: 1 – 78. Gabrielis de Sancha, Madrid.
  • Rusby, H. H. (1895). On the collections of Mr Miguel Bang in Bolivia – Part 2. Mem. Torrey Bot. Club 4: 203 – 274.
  • Wasshausen, D. C. (1999). The genus Stenostephanus (Acanthaceae) in Bolivia. Harvard Pap. Bot. 4: 279 – 288.
  • Wood, J. R. I. (1988). Colombian Acanthaceae — some new discoveries and some reconsiderations. Kew Bull. 43: 1 – 51.
  • ____ & Wood, J. R. I. (2001). Further discoveries in the genus Stenostephanus (Acanthaceae) in Bolivia. Harvard Pap. Bot. 6: 449 – 454.
  • ____ & ____ (2004). The Acanthaceae of Bolivia. Contr. U. S. Natl. Herb. 49: 1 – 152.
  • ____ (1914). Acanthaceae. In: R. Pilger (ed.), Plantae Uleanae. Notizbl. Königl. Bot. Gart. Berlin 6: 192 – 200.
  • ____ (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.
  • ____ (2015). New species of Acanthaceae from Bolivia. Kew Bull. 70(34): 1 – 6.
  • ____ (2016). Acanthaceae. In: R. Bernal, S. R. Gradstein & M. Célis (eds), Catálogo de Plantas y Liquenes de Colombia, Vol. 1: 583 – 611. Universidad Nacional de Colombia, Bogotá.
  • ____ (2019). Stenostephanus (Acanthaceae) in Peru. Kew Bull 74:

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.