Stenostephanus wasshausenii J.R.I.Wood

This species is accepted, and its native range is SE. Peru.


Wood, J.R.I. Stenostephanus (Acanthaceae) in Peru. Kew Bulletin 74: 64 doi:10.1007/s12225-019-9843-0

With an area of occupancy of 8,000 km2, based on Geocat, this species should be provisionally classified as Critically Endangered (CR). It is only known from two collections, the most recent made almost forty years ago and at least one from an area of settlement that must be threatened by forest clearance. However, further studies will be needed to confirm this highly provisional classification.
It is known from only two collections and is endemic to Carabaya Province in the Puno region in the south of Peru.
A rare species of rainforest in the Andean foothills from about 500 to 900 m.
Morphology General Habit
Subshrub, 1 m high
Morphology Leaves
Leaves subsessile (although possibly shortly petiolate below); lamina 6.5 – 27 × 2 – 9.5, slightly unequal in each pair, oblong-elliptic, acuminate, attenuate to a winged base, margin obscurely crenate, veins about 11 pairs, both surfaces glabrous, with abundant cystoliths, abaxially paler
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens shortly exserted, filaments glabrous; anthers 6 mm
Morphology Reproductive morphology Flowers Calyx
Calyx 12 – 20 mm long, glabrous, 5-lobed to near the base, the lobes 2.5 – 3.5 mm wide, oblong, abruptly narrowed at apex to a broad green mucro
Morphology Reproductive morphology Flowers Corolla
Corolla c. 3.6 – 4 cm long, suburceolate and widened to c. 10 mm just above the middle, glabrous, reddish-purple, obscurely 2-lipped, the limb composed of short, narrowly ovate, purplish lobes c. 3 mm long
Morphology Reproductive morphology Flowers Gynoecium Style
Style glabrous, stigma clavate
Morphology Reproductive morphology Fruits
Capsule 17 mm long, glabrous, 4-seeded
Morphology Reproductive morphology Inflorescences
Inflorescence an open, diffuse, repeatedly branched, glabrous panicle up to 20 × 18 cm, the flowers solitary or paired at the branch tips; bracteoles linear-lanceolate, 1 – 2 mm long, persistent
Morphology Reproductive morphology Inflorescences Peduncles
Peduncles 3 – 7 cm; secondary and subsequent peduncles 1 – 3 cm, diminishing slightly in length towards the tips
Morphology Reproductive morphology Seeds
Seeds (immature), ovate in outline, 2 × 1.5 mm, reticulate.
Morphology Stem
Stem ± quadrangular, with abundant cystoliths but otherwise glabrous
Obviously related to Stenostephanus atrocalyx but distinguished by the much branched paniculate inflorescence, large calyx with lobes 12 – 20 × 2.5 – 3.5 mm and large glabrous corolla 3.6 – 4 cm long. This species is named for Dieter Wasshausen, collector of the type specimen of this species and the leading expert on neotropical Acanthaceae since the 1970s. He has also been a generous friend, field companion and colleague of the author for more than 20 years.
Peru, Puno, Carabaya, San Gaban, 900 m, 12 June 1982, D. C. Wasshausen & A. Salas 1251 (holotype US 2957095).

Native to:


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

First published in Kew Bull. 74(4)-64: 21 (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

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  • Champluvier, D. & Darbyshire, I. (2009). A revision of the genera Brachystephanus and Oreacanthus (Acanthaceae) in tropical Africa. Syst. & Geogr. Pl. 79: 115 – 192.
  • Daniel, T. (2006). Synchronous flowering and monocarpy suggest plietesial life history for neotropical Stenostephanus chiapensis (Acanthaceae). Proc. Calif. Acad. Sci. 57: 1011 – 1018.
  • Hokche, O., Berry, P. E. & Huber, O. (2008). Nuevo catálogo de la flora vascular de Venezuela.1 – 859. Fundación Instituto Botánico de Venezuela, Caracas.
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  • Lindau, G. (1914). Acanthaceae. In: R. Pilger (ed.), Plantae Uleanae. Notizbl. Königl. Bot. Gart. Berlin 6: 192 – 200.
  • Lindau, G. (1922). Neue Gattungen der Acanthaceen. Notizbl. Bot. Gart. Berlin-Dahlem 8: 142 – 144.
  • 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. (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.
  • Wasshausen, D. C. & Wood, J. R. I. (2001). Further discoveries in the genus Stenostephanus (Acanthaceae) in Bolivia. Harvard Pap. Bot. 6: 449 – 454.
  • Wasshausen, D. C. & ____ (2004). The Acanthaceae of Bolivia. Contr. U. S. Natl. Herb. 49: 1 – 152.
  • Wasshausen, D. C. (1985). New species of Hansteinia (Acanthaceae) from Colombia and Ecuador. Brittonia 37: 203 – 208.
  • Wasshausen, D. C. (1999a). The genus Stenostephanus (Acanthaceae) in Bolivia. Harvard Pap. Bot. 4: 279 – 288.
  • Wasshausen, D. C. (1999b). In: P. M. Jørgensen & S. León-Yánez (eds), Catalogue of the Vascular Plants of Ecuador. Monogr. Syst. Bot. Missouri Bot. Gard. 75: 1 – 1181.
  • Wasshausen, D. C. (2007). A checklist of the Acanthaceae collected in the “Sira Mountains” of Peru. Ann. Naturhist. Mus. Wien 108 B: 167 – 190.
  • Wasshausen, D. C. (2013). Acanthaceae. In: C. Persson & B. Stahl (eds), Flora of Ecuador, Vol. 179: 1 – 328. University of Gothenburg, Göteborg.
  • Wood, J. R. I. (1988). Colombian Acanthaceae — some new discoveries and some reconsiderations. Kew Bull. 43: 1 – 51.
  • Wood, J. R. I. (2009). New names, combinations and synonyms in Justicia and Stenostephanus (Acanthaceae). Kew Bull. 64: 49 – 55.

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  • Kew Names and Taxonomic Backbone

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