- Family:
- Polygonaceae Juss.
- Genus:
- Oxygonum Burch. ex Campd.
Oxygonum stuhlmannii Dammer

[FZ]
Flora Zambesiaca. Vol. 9, Part 3. Polygonaceae-Myriaceae. Pope GV, Polhill RM, Martins ES. 2006.
- Type
- Type from Tanzania.
- Morphology General Habit
- Perennial herb, with several stems from a woody rootstock Perennial herb, with several stems from a woody rootstock.
- Morphology Stem
- Stems red-brown, trailing or ascending, 40–50 cm long, longitudinally striate, puberulous Stems red-brown, trailing or ascending, 40–50 cm long, longitudinally striate, puberulous.
- Morphology Leaves
- Leaves 1.5–5 × 0.6–1.2 cm, lanceolate or elliptic.lanceolate to ± deltate, apex acute, base narrowed into a petiole up to 1 cm long, margin usually ± shallowly lobed, sometimes entire, midrib prominent beneath, lamina sparsely puberulous on both surfaces Leaves 1.5–5 × 0.6–1.2 cm, lanceolate or elliptic-lanceolate to ± deltate, apex acute, base narrowed into a petiole up to 1 cm long, margin usually ± shallowly lobed, sometimes entire, midrib prominent beneath, lamina sparsely puberulous on both surfaces.
- Morphology Leaves Ocrea
- Ocrea 5–8 mm long, membranous, truncate with a terminal fringe of reddish wavy setae c. 5 mm long Ocrea 5–8 mm long, membranous, truncate with a terminal fringe of reddish wavy setae c. 5 mm long.
- Morphology Reproductive morphology Flowers
- Hermaphrodite flowers strongly heterostylous; perianth 5-lobed; tube 1.5 mm long, pubescent outside; lobes 2–2.5(5) mm long, oblong Male flowers not seen Flowers pedicellate, 1–4 in the axil of bracts, arranged in an elongated spiciform raceme up to c. 35 cm long; raceme erect or slightly arcuate; bracts 2.5–4 mm long, puberulous to glabrous, truncate, fringed at the apex with 3–5 setae c. 2 mm long; pedicels 4–6 mm long; bracteoles 2.5–4 mm long Flowers pedicellate, 1–4 in the axil of bracts, arranged in an elongated spiciform raceme up to c. 35 cm long; raceme erect or slightly arcuate; bracts 2.5–4 mm long, puberulous to glabrous, truncate, fringed at the apex with 3–5 setae c. 2 mm long; pedicels 4–6 mm long; bracteoles 2.5–4 mm long. Hermaphrodite flowers strongly heterostylous; perianth 5-lobed; tube 1.5 mm long, pubescent outside; lobes 2–2.5(5) mm long, oblong. Male flowers not seen.
- Morphology Reproductive morphology Flowers Androecium Stamens Filaments
- Filaments 2–3 mm long; anthers 0.3–0.4 × 0.2–0.3 mm, ellipsoid
- Morphology Reproductive morphology Flowers Gynoecium Ovary
- Ovary 3–3.5 mm long, fusiform; styles of long-styled flowers 3–3.5 mm long, free almost to the base, strongly exserted; styles of short-styled flowers c. 1 mm long
- Ecology
- On disturbed soils, sandy soils on roadsides, in miombo woodland; 775–2100 m.
- Note
- This species shows considerable variation in leaf shape and in the hairiness of the leaves. Oxygonum baumii, the type of which is the only record for Angola, was included here with doubt by Graham, loc. cit. (1957).
- Distribution
- MAL N Malawi Also in Dem. Rep. Congo (Kivu), Kenya, Tanzania and Angola.
- sex Male
- Male flowers not seen.
- Morphology Reproductive morphology Flowers Androecium Stamens
- Filaments 2–3 mm long; anthers 0.3–0.4 × 0.2–0.3 mm, ellipsoid.
- sex Hermaphrodite
- Filaments 2–3 mm long; anthers 0.3–0.4 × 0.2–0.3 mm, ellipsoid. Ovary 3–3.5 mm long, fusiform; styles of long-styled flowers 3–3.5 mm long, free almost to the base, strongly exserted; styles of short-styled flowers c. 1 mm long. Hermaphrodite flowers strongly heterostylous; perianth 5-lobed; tube 1.5 mm long, pubescent outside; lobes 2–2.5(5) mm long, oblong.
- Morphology Reproductive morphology Flowers Gynoecium Pistil
- Ovary 3–3.5 mm long, fusiform; styles of long-styled flowers 3–3.5 mm long, free almost to the base, strongly exserted; styles of short-styled flowers c. 1 mm long.
- Morphology Reproductive morphology Fruits
- Nut c. 5 mm long, fusiform, trigonous, papillose, with 3 spreading prickles on the angles a little below the middle, 3–5 mm long. Nut c. 5 mm long, fusiform, trigonous, papillose, with 3 spreading prickles on the angles a little below the middle, 3–5 mm long.
[FTEA]
Polygonaceae, R. A. Graham. Flora of Tropical East Africa. 1958
- Morphology General Habit
- ? Perennial herb, probably with a trailing woody base, and with ascending, reddish, puberulous stems.
- Morphology Leaves Ocrea
- Ocreae 5–8 mm. long, membranous, puberulous, truncate with a terminal fringe of rather wavy setae ± 5 mm. long.
- Morphology Leaves
- Leaves petiolate, up to 5 × 1.2 cm., lanceolate, elliptic-lanceolate, or subdeltoid, the margins ± entire or more usually shallowly sinuous, very acute long narrowed to the base, glabrous, pustular on the undersurface.
- Morphology Leaves Petiole
- Petioles rather long, up to 1 cm. in length.
- Morphology Reproductive morphology Inflorescences
- Inflorescence elongated, rather stout, up to ± 35 cm. long, straight or slightly arcuate.
- Morphology Reproductive morphology Inflorescences Bracts
- Bracts 2.5–4 mm. long, puberulous to glabrous, fringed with 3–5 setae ± 2 mm. long.
- Morphology Reproductive morphology Flowers Pedicel
- Pedicels somewhat exceeding the bracts.
- Morphology Reproductive morphology Flowers
- Flowers strongly heterostylous. Long styles 3–3.5 mm. long, free almost to the base, strongly exserted. Short styles 1 mm. long or slightly less. Tepals ovate-elliptic, 2 mm. long (5 mm. in long-styled flowers, fide Dammer).
- Morphology Reproductive morphology Fruits
- Fruit 5 mm. long, fusiform, thinly papillose, with 3 spreading prickles a little below the middle.
- Habitat
- Cultivated or disturbed ground; from 2100 m. probably nearly to sea level
- Distribution
- K3 T1 T2 T3 T4 also probably in Nyasaland and Rhodesia
Native to:
Angola, Burundi, Kenya, Malawi, Tanzania, Zaïre
Oxygonum stuhlmannii Dammer appears in other Kew resources:
Date | Reference | Identified As | Barcode | Type Status | Has image? |
---|---|---|---|---|---|
Apr 6, 1956 | Baum, H. [532], Angola | K000244065 | Unknown type material | Yes | |
Bidgood, S. [6249], Tanzania | K000468176 | No | |||
Bidgood, S. [5979], Tanzania | K000468446 | No | |||
Bidgood, S. [6424], Tanzania | K000468001 | No | |||
Bidgood, S. [6017], Tanzania | K000468408 | No | |||
Scott Elliot, G.F. [8322], Tanzania | Oxygonum fasciculatum | K000244054 | Yes | ||
unknown [6651], Tanzania | Oxygonum fasciculatum | K000244055 | lectotype | Yes | |
unknown [6265], Tanzania | Oxygonum fasciculatum | K000244056 | Yes |
First published in H.G.A.Engler, Pflanzenw. Ost-Afrikas, C: 171 (1895)
Accepted by
- Figueiredo, E. & Smith, G.F. (2008). Plants of Angola. Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
- Graham, R.A. (1958). Flora of Tropical East Africa, Polygonaceae: 1-40.
- Lewalle, J. (1970). Liste floristique et répartition altitudinale de la flore du Burundi occidental: 1-84. Université officielle de Bujumbura.
Literature
Flora Zambesiaca
- Engler, Pflanzenw. Ost-Afrikas C: 171 (1895).
- F.T.A. 6, 1: 102 (1909).
- F.T.E.A., Polygonaceae: 38 (1958).
- Kew Bull. 12: 161 (1957)
Kew Backbone Distributions
- Figueiredo, E. & Smith, G.F. (2008). Plants of Angola. Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
- Lewalle, J. (1970). Liste floristique et répartition altitudinale de la flore du Burundi occidental: 1-84. Université officielle de Bujumbura.
- Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.
Flora of Tropical East Africa
- Baker & C.H. Wright in Flora of Tropical Africa 6 (1): 102 (1909).
- Dammer in Die Pflanzenwelt Ost-Afrikas und der Nachbargebiete, Theile C: 171 (1895).
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Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0
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Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0
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Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/
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Kew Backbone Distributions
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 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