Stathmostelma fornicatum (N.E.Br.) Bullock

First published in Kew Bull. 8: 55 (1953)
This species is accepted
The native range of this species is Tanzania to Angola and N. Botswana. It is a tuberous geophyte and grows primarily in the seasonally dry tropical biome.

Descriptions

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

Morphology General Habit
Perennial herb to ± 0.6 m tall, with a single annual stem arising from a large napiform tuber.
Morphology Stem
Stems erect or ascending, generally branched below, glabrous or minutely pubescent with short white hairs
Morphology Leaves
Leaves with petiole 2–5(–20) mm long; lamina linear, 8–20 × 0.3–1.3 cm, acute, base truncate or rounded, minutely pubescent with short, stiff hairs particularly on the margins and midrib
Morphology Reproductive morphology Inflorescences
Inflorescences terminal or extra-axillary with 2–4(–5) flowers in an erect umbel.
Morphology Reproductive morphology Inflorescences Peduncles
Peduncles 2–14(–18) cm long, the lower inflorescences with markedly longer peduncles than the upper ones, erect, minutely pubescent.
Morphology Reproductive morphology Inflorescences Bracts
Bracts caducous.
Morphology Reproductive morphology Flowers Pedicel
Pedicels 2–5 cm long, minutely pubescent Fruiting pedicel not contorted.
Morphology Reproductive morphology Flowers Calyx
Sepals lanceolate to ovate, 4–7 × 1–3.5 mm, acute or subacute, glabrous or pubescent with ciliate margins, green or tinged purple towards apex
Morphology Reproductive morphology Flowers Corolla
Corolla rotate to campanulate, outer face greenish, chrome-yellow within; lobes lanceolate to ovate, 14–20 × 4–7 mm, acute or subacute, plane or somewhat replicate, glabrous on outer surface, minutely papillose within.
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium with stipe 1–2 mm long
Morphology Reproductive morphology Flowers Corona
Corona lobes erect, yellow or orange, ± 1.5 times as tall as column, (5–)7–8 × ± 3 mm, appearing concave-cucullate for most of their length but in fact solid except for the papillose proximal and upper margins, ± triangular in section above, apex rounded distally, the inner apical margins extending over the head of the column as a pair of broadly oblong, acute or obliquely truncate teeth 2–3 × 2–3 mm, cavity sinus with or without a well developed central tooth
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings 3–5 × 1 mm, curving somewhat under the anthers; anther appendages ± 2 mm long, semicircular and inflexed over apex of stylar head; corpusculum black, subcylindrical, 0.5–0.6 × 0.1–0.2 mm; translator arms with a membranous, obovate, convex and somewhat contorted proximal part 2–3.5 × 0.7–1 mm, and a filiform distal part 1–1.4 mm long broadening abruptly into a clasping overlap with the pollinium.
Morphology Reproductive morphology Flowers Pollinia
Pollinia oblong, 1–1.3 × 0.3–0.4 mm, flattened
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head flat
Morphology Reproductive morphology Fruits
Follicle erect, fusiform, ± 11 × 0.6 cm, beaked, not inflated, smooth, minutely pubescent when young, glabrous at maturity
Morphology Reproductive morphology Seeds
Seeds ± 5 × 3 mm.
[FTEA]

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
Malawi?, Nyika Plateau, ii- iii.1903, McClounie 81 (K holotype).
Morphology General Habit
Perennial herb to c.0.6 m tall, with a single annual stem arising from a large napiform tuber; stems generally branched below, erect or ascending, glabrous or minutely pubescent with short white hairs
Morphology Leaves
Leaves with petiole 2–5(20) mm long; lamina 8–20 × 0.3–1.3 cm, linear, acute, base truncate or rounded, minutely pubescent with short, stiff hairs particularly on the margins and midrib
Morphology Reproductive morphology Inflorescences
Inflorescences terminal or extra-axillary with 2–4(5) flowers in an erect umbel, peduncles 2–14(18) cm long, the lower inflorescences with markedly longer peduncles than the upper ones, erect, minutely pubescent; bracts caducous; pedicels 2–5 cm long, minutely pubescent
Morphology Reproductive morphology Flowers Calyx
Sepals 4–7 × 1–3.5 mm, lanceolate to ovate, acute or subacute, glabrous or pubescent with ciliate margins, green or tinged purple towards apex
Morphology Reproductive morphology Flowers Corolla
Corolla rotate to campanulate, outer face greenish, chrome-yellow within; lobes 14–20 × 4–7 mm, lanceolate to ovate, acute or subacute, plane or somewhat replicate, glabrous on outer surface, minutely papillose within
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium with stipe 1–2 mm long
Morphology Reproductive morphology Flowers Corona
Corona lobes yellow or orange, erect and c.1.5 times as tall as column, (5)7–8 × c.3 mm, appearing concave-cucullate for most of their length but in fact solid except for the papillose proximal and upper margins, ± triangular in section above, apex rounded distally, the inner apical margins extending over the head of the column as a pair of broadly oblong, acute or obliquely truncate teeth c.2–3 × 2–3 mm, cavity sinus with or without a well developed central tooth Corona with 1 or 2 rudimentary fleshy teeth towards the top of the cavity sinus.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings 3–5 × 1 mm, curving somewhat under the anthers; anther appendages c.2 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, c.11 × 0.6 cm, fusiform, beaked, not inflated, smooth, minutely pubescent when young, glabrous at maturity
Morphology Reproductive morphology Seeds
Seeds c.5 × 3 mm, ovate with a verrucose, minutely pubescent disc and a narrow inflated rim.
Distribution
Botswana, Zambiam Zimbabwe, Malawi. Also known from Angola.
Ecology
Seasonally waterlogged grassland and mopane- or acacia- woodland; 700–1100(2500) m.
[FZ]

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]

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