Peliostomum viscosum E.Mey. ex Benth.

This species is accepted, and its native range is S. Namibia to NW. Cape Prov.

[KBu]

Kolberg H., van Salgeren M. 2016. A synopsis of Aptosimum and Peliostomum (Scrophulariaceae) in Namibia, including the description of a new species, Aptosimum radiatum, and keys to all accepted species. Kew Bulletin 71:16. DOI 10.1007/S12225-016-9628-7

Conservation
Evaluated for Namibia as LC. Under criterion B the EOO qualifies the species for VU and the AOO for EN, but no additional two criteria to place the species into a threatened category, are met (IUCN 2012, 2013). The small EOO and AOO are possibly due to the insufficient data that were available. In South Africa the species is evaluated as LC (SANBI 2014).
Distribution
Africa: Namibia, South Africa.
Ecology
Occurs in rocky sand with various lithologies on plains, slopes and outcrops. Recorded for the succulent steppe, desert-dwarf shrub savanna transition and dwarf shrub savanna vegetation types (Mendelsohn et al. 2010). Found in the Southern Namib Succulent Desert, Huns-Orange, Escarpment and Gordonia phytogeographical groups of Craven (2009). Altitude: 600 – 1180 m.
Morphology General Habit
Shrub, erect, 10 – 15 (– 25) cm tall, not spinescent
Morphology Leaves
Leaves obovate at base of plant, upper subrotund, 6 – 15 × 3 – 8 mm, slightly fleshy, viscid, glandular; apex obtuse; base sessile to narrowed into petiole; petiole 1 – 2 mm long; midrib of basal leaves prominent beneath
Morphology Reproductive morphology Flowers
Flowers solitary, axillary, subsessile, overtopping leaves; bracteoles half the length of calyx
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 4; filaments almost equal in length; anthers equal, shortly ciliate-pubescent
Morphology Reproductive morphology Flowers Calyx
Calyx lobed to base, 4 – 5 mm long; lobes linear to narrowly obovate, shorter than capsule, predominantly glandular-hairy outside, viscid, papillose inside, glandular hairs intermixed towards apex, apex acute
Morphology Reproductive morphology Flowers Corolla
Corolla 12 – 20 mm long, overtopping bracteoles; narrow basal part of tube only just longer than calyx, whitish to pale purple, often with darker venation outside; lobes circular to elliptic, inside dark blue to purple with darker patch at base
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary narrowly ovoid, glandular hairy; style filiform, pubescent and slightly glandular at base; stigma capitellate
Morphology Reproductive morphology Fruits
Capsule narrowly ovoid, apex slightly compressed, 5 – 8 mm long, puberulous, glandular; calyx lobes reaching about half length of capsule
Morphology Reproductive morphology Seeds
Seed ellipsoid, pale tan to whitish, with white, longitudinal, laminate protruberances that have irregular margins.
Morphology Stem
Stems woody at base, sometimes only weakly so, rigid, erect, divaricately branched at base, leafy above, viscid, appressed glandular-pubescent, internodes of variable length
Note
Drège s.n. [2446] in the Paris herbarium (P-3412891) is chosen here as the lectotype because of the good quality of the specimen bearing a label in the collector’s handwriting.

Phillips (1950) was of the opinion that species of Peliostomum should be included within Aptosimum and published the necessary name changes. He did, however, not consider that he created a later homonym by transferring P. viscosum to Aptosimum since the resulting name had already been used by Bentham (1836) who described both A. viscosum and P. viscosum in that publication.Peliostomum viscosum may resemble forms of P. leucorrhizum (notably in its southern distribution range) where leaf shape is similar. It is usually far more densely glandular all over and the anther indumentum differs.

Phenology
Flowering and fruiting throughout the year. Peak flowering: June – Sept. Peak fruiting: July – Sept.
Type
Type: South Africa, Rocks on the Gariep [Garip, auf steinigen und felsigen Höhen bei Verleptpram], Drège s.n. [2446] (lectotype P-3412891!, selected here; isolectotypes HBG-512060!, S-G-4657!).

Native to:

Cape Provinces, Namibia

Peliostomum viscosum E.Mey. ex Benth. appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Drege [2446], South Africa K000410883 Yes
Drege [2446], South Africa K000410884 Yes

First published in Edwards's Bot. Reg. 22: t. 1882 (1836)

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 Bulletin

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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.

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    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

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  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. 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