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This species is accepted, and its native range is N. Central Peru.

[KBu]

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

Conservation
With a single collection and no details about the plant’s frequency or of threats to its habitat, this species can only be categorised as Data Deficient (DD) within IUCN guidelines.
Distribution
Endemic to Peru and only known from the type locality.
Ecology
Lowland rainforest, 650 – 800 m.
Morphology General
This species resembles Stenostephanus longistamineus in the form of its inflorescence, shape of its calyx lobes and distinct corolla shape — somewhat obovoid in bud
Morphology Reproductive morphology Flowers Calyx
The calyx is also reddish-brown but minutely glandular, rather than pubescent.
Morphology Reproductive morphology Flowers Corolla
It differs in the larger, strongly 2-lipped corolla with the tube 35 – 38 mm in length, the upper lip 8 – 10 mm long and the lower lip 16 – 18 mm long, 3-lobed at the tip
Morphology Reproductive morphology Inflorescences
The inflorescence branches, rhachis and pedicels are reddish-brown pubescent
Note
Without seeing further specimens from the same area, it is difficult to be sure whether the distinctive differences with Stenostephanus longistamineus are maintained or if there are intermediates between the two species .
Type
Peru, Huánuco, Prov. Pachitea, c. 24 km SE of Puerto Inca from “Campamento Sira”, down valley of Río Negro, 9°28'S 74°47'W, 650 – 800 m, 16 March 1988, B. Wallnöfer & M. Henzel 110-16388 (holotype W, isotypes US, USM).

Native to:

Peru

Stenostephanus wallnoeferi Wassh. appears in other Kew resources:

First published in Ann. Naturhist. Mus. Wien, B 108: 184 (2007)

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. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

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