Stathmostelma stipitatum Goyder

First published in Fl. Trop. E. Africa, Apocyn. (2): 414 (2012)
This species is accepted
The native range of this species is Tanzania. It is a perennial 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

Note
Most closely allied to the Angolan species S. incarnatum K. Schum., but differs in the shorter anther wings (1.5 mm rather than ± 2 mm), the longer gynostegial stipe (± 3 mm rather than 0.5 mm), the corona lobes lacking prominent lateral teeth, and the pollinarium with a smaller proximal winged part to the translator arms (0.3 mm long, rather than 0.6 mm).
Morphology General Habit
Perennial herb with single annual stem arising from underground rootstock.
Vegetative Multiplication Tubers
Tuber not seen.
Morphology Stem
Stems erect, ± 0.6 m long, simple, subglabrous
Morphology Leaves
Leaves subsessile or with petiole to ± 2 mm long; lamina linear, 7–12.5 × 0.1–0.3 cm, attenuate, base narrowly cuneate, tapering gently into the petiole, glabrous
Morphology Reproductive morphology Inflorescences
Inflorescences terminal and extra-axillary at upper node(s) with 2–5 flowers in an erect umbel.
Morphology Reproductive morphology Inflorescences Peduncles
Peduncles erect, 1.5–5 cm long, minutely pubescent.
Morphology Reproductive morphology Inflorescences Bracts
Bracts caducous.
Morphology Reproductive morphology Flowers Pedicel
Pedicels 1.5–5 cm long, minutely pubescent, tinged reddish Fruiting pedicel not contorted.
Morphology Reproductive morphology Flowers Calyx
Sepals ovate-lanceolate, ± 2 × 0.8 mm, acute, usually tinged red towards tip, glabrous
Morphology Reproductive morphology Flowers Corolla
Corolla dark brown, rotate or slightly reflexed, but drying reddish purple, glabrous on outer surface, minutely papillose within; lobes obovate, 5–6 × 3 mm, acute, plane or with somewhat revolute margins
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium with stipe ± 3 mm long
Morphology Reproductive morphology Flowers Corona
Corona lobes purple, erect and ± as tall as column, ± 2 mm long, apex rounded distally, the inner apical margins produced into a pair of short, acute teeth directed towards the column
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings 1.5 mm long, triangular, not curved; anther appendages 1–1.5 mm long, semicircular and inflexed over apex of stylar head; corpusculum black, ovoid-subcylindrical, ± 0.25 × 0.1 mm; translator arms with a winged proximal part ± 3 mm long, and a geniculate distal part 0.4 mm long.
Morphology Reproductive morphology Flowers Pollinia
Pollinia obovate, ± 0.8 × 0.3 mm, flattened
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head flat
Morphology Reproductive morphology Fruits
Follicle erect, fusiform, ± 11–13 × 0.5 cm, beaked, not inflated, smooth, glabrous
Morphology Reproductive morphology Seeds
Seeds not seen.
Ecology
Seasonally waterlogged grassland; ± 1000 m
Distribution
Flora districts: Known only from the type Flora districts: T4
[FTEA]

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: threatened. Confidence: confident
[AERP]

Sources

  • Angiosperm Extinction Risk Predictions v1

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