Stathmostelma pedunculatum (Decne.) K.Schum.

First published in Bot. Jahrb. Syst. 17: 132 (1893)
This species is accepted
The native range of this species is Cameroon to Ethiopia and Mozambique. It is a perennial and grows primarily in the seasonally dry tropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Goyder, D. J., Gilbert, M. G. & Venter, H. J. T. (2020). Apocynaceae (part 2). In: M. A. García (ed.), Flora Zambesiaca, Vol. 7(3). Royal Botanic Gardens, Kew.

Type
Ethiopia, between Adowa and Gondar, 1840, Quartin-Dillon s.n. (P lectotype, K photograph), designated by Goyder in Kew Bull. 53: 586 (1998).
Morphology General Habit
Perennial herb with 1–4 annual stems arising from a slender, vertical, napiform tuber; stems 0.1–0.5(1) m long, simple or occasionally branched below, erect or ascending, minutely pubescent with short white hairs
Morphology Leaves
Leaves sessile or with petiole to 5 mm long; lamina (4)7–15(19) × 0.2–1.3 cm, linear to lanceolate, acute, base truncate or rounded, minutely pubescent with short, stiff hairs on both upper and lower surfaces
Morphology Reproductive morphology Inflorescences
Inflorescences terminal or extra-axillary with 2–4(7) flowers in an erect umbel, peduncles (6)8–20(29) cm long, the lower inflorescences with markedly longer peduncles than the upper ones, thus raising all the flowers to approximately the same level, erect, minutely pubescent; bracts caducous; pedicels 2–5 cm long, pubescent
Morphology Reproductive morphology Flowers Calyx
Sepals 2–6 × 1–2 mm, lanceolate to ovate, acute, usually tinged red towards tip, densely pubescent
Morphology Reproductive morphology Flowers Corolla
Corolla rotate or slightly reflexed, pink to orange-red, pubescent at least towards tip on outer surface, minutely papillose towards the base within; lobes 8–17 × 4–6 mm, oblong to obovate, acute, plane
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium with stipe 1–3 mm long
Morphology Reproductive morphology Flowers Corona
Corona lobes pink, red or orange with orange or yellow teeth, 4–7 × 1.5–2.5 mm, erect, 1–2 times as tall as column, weakly pouched towards the base on each side of the mid-line, appearing concave-cucullate for most of its length but in fact solid except for the proximal and upper margins, apex rounded distally, the inner apical margins produced into a pair of inward- or upward-pointing teeth 1–2 mm long and with a tooth to 2.5 mm long arising from the middle of the cavity, glabrous
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings 2–3 mm long, curved; anther appendages 1–1.5 mm long, semicircular and inflexed over apex of stylar head
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head flat
Morphology Reproductive morphology Fruits
Fruiting pedicel not contorted; follicle erect, 8–12.5 × 0.5–1 cm, fusiform, beaked, not inflated, smooth, densely pubescent
Morphology Reproductive morphology Seeds
Seeds c.5 × 3 mm, ovate with a verrucose disc and a narrow inflated rim.
Distribution
Mozambique. Also known from Cameroon, Sudan, Ethiopia, D.R. Congo (Kivu), Uganda, Kenya and Tanzania.
Ecology
Growing among grass often in seasonally waterlogged grassland; 0–2200 m.
[FZ]

Apocynaceae (part 2), David Goyder, Timothy Harris, Siro Masinde, Ulrich Meve, Johan Venter. Flora of Tropical East Africa, 2012

Morphology General Habit
Perennial herb with 1–4 annual stems arising from a slender, vertical, napiform tuber.
Morphology Stem
Stems erect or ascending, 0.1–0.5(–1) m long, simple or occasionally branched below, minutely pubescent with short white hairs
Morphology Leaves
Leaves sessile or with petiole to 5 mm long; lamina linear to lanceolate, (4–)7–15(–19) × 0.2–1.3 cm, acute, base truncate or rounded, minutely pubescent with short, stiff hairs on both upper and lower surfaces
Morphology Reproductive morphology Inflorescences
Inflorescences terminal or extra-axillary with 2–4(–7) flowers in an erect umbel.
Morphology Reproductive morphology Inflorescences Peduncles
Peduncles erect, (6–)8–20(–29) cm long, the lower inflorescences with markedly longer peduncles than the upper ones, thus raising all the flowers to approximately the same level, minutely pubescent.
Morphology Reproductive morphology Inflorescences Bracts
Bracts caducous.
Morphology Reproductive morphology Flowers Pedicel
Pedicels 2–5 cm long, pubescent Fruiting pedicel not contorted.
Morphology Reproductive morphology Flowers Calyx
Sepals lanceolate to ovate, 2–6 × 1–2 mm, acute, usually tinged red towards tip, densely pubescent
Morphology Reproductive morphology Flowers Corolla
Corolla pink to orangered, rotate or slightly reflexed, pubescent at least towards tip on outer surface, minutely papillose towards the base within; lobes oblong to obovate, 8–17 × 4–6 mm, acute, plane
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium with stipe 1–3 mm long
Morphology Reproductive morphology Flowers Corona
Corona lobes pink, red or orange with orange or yellow teeth, erect, 4–7 × 1.5–2.5 mm, 1–2 times as tall as column, weakly pouched towards the base on each side of the mid-line, appearing concave-cucullate for most of its length but in fact solid except for the proximal and upper margins, apex rounded distally, the inner apical margins produced into a pair of inward- or upward-pointing teeth 1–2 mm long and with a tooth to 2.5 mm long arising from the middle of the cavity, glabrous
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings 2–3 mm long, curved; anther appendages semicircular, 1–1.5 mm long, and inflexed over apex of stylar head; corpusculum black, ovoid to subcylindrical, ± 0.4 × 0.1–0.2 mm; translator arms with a membranous, obovate, convex and somewhat contorted proximal part ± 1.4 × 0.6 mm, and a filiform distal part ± 0.6–1 mm long broadening abruptly into a short clasping overlap with the pollinium.
Morphology Reproductive morphology Flowers Pollinia
Pollinia oblong or obovate, ± 1 × 0.4 mm, flattened
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head flat
Morphology Reproductive morphology Fruits
Follicle erect, fusiform, 8–12.5 × 0.5–1 cm, beaked, not inflated, smooth, densely pubescent.
Morphology Reproductive morphology Seeds
Seeds ± 5 × 3 mm.
Ecology
Grassland, often in seasonally waterlogged grassland; 0–2200 m
Note
In coastal regions of Kenya and Tanzania, and as far up as Nairobi, corona lobes are up to ± 5 mm long excluding the acute teeth, ± as tall as the column and flat-topped. Elsewhere in inland areas they may be 2 times the height of the column, the teeth commonly oblong and obtuse, and angled upwards, the main part of lobe to 7 mm long.. Kirrika 183 from K 4, with lemon yellow flowers, may be a pale-flowered form of this species rather than S. welwitschii.
Distribution
Range: Cameroon, Sudan, Ethiopia, Congo-Kinshasa (Kivu) and Mozambique Flora districts: U1 U2 U3 U4 K 1?, K2 K4 K6 K7 T1 T2 T3 T4 T5
[FTEA]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
  • Flora Zambesiaca

    • Flora Zambesiaca
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0