Calotropis R.Br.

First published in Asclepiadeae: 28 (1810)
This genus is accepted
The native range of this genus is Tropical & Subtropical Old World.

Descriptions

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

Morphology General Habit
Erect shrubs
Morphology Leaves
Leaves large, succulent.
Morphology Reproductive morphology Inflorescences
Inflorescences terminal and extra-axillary, pedunculate, with several clusters of umbelliform cymes
Morphology Reproductive morphology Flowers Corolla
Corolla lobed for ± 2/3 of its length
Morphology Reproductive morphology Flowers Corona
Corolline corona absent Gynostegial corona lobes laterally compressed with an upturned spur at the base, radiating out from the gynostegium to which they are adnate for their entire length
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria with oblong, slightly winged corpuscula and short, cylindrical translator arms.
Morphology Reproductive morphology Flowers Pollinia
Pollinia flattened, pear-shaped
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head pentagonal, depressed or raised slightly above the top of the anthers
Morphology Reproductive morphology Fruits
Follicles large, ovate or subglobose, smooth, usually only one of the pair developing, with spongy fibrous mesocarp and a papery endocarp. Seeds ovate, plano-convex, pubescent, with a coma of silky hairs.
Note
Three species in Africa, Arabia and southern and SE Asia, introduced elsewhere in the tropics.
[FTEA]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Erect shrubs with large succulent leaves; latex white
Morphology Reproductive morphology Inflorescences
Inflorescences terminal and extra-axillary, pedunculate, usually with at least 2 major branches each with successive subumbelliform clusters of flowers
Morphology Reproductive morphology Flowers Corolla
Corolla lobed for c. 2/3 of its length
Morphology Reproductive morphology Flowers Corona
Corolline corona absent Gynostegial corona of 5 laterally compressed staminal lobes with an upturned spur at the base, radiating out from the gynostegium to which they are adnate for their entire length
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria with a pair of pendent, flattened, pear-shaped pollinia
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigmatic head pentagonal, depressed or raised slightly above the top of the anthers
Morphology Reproductive morphology Fruits
Follicles large, ovoid or subglobose, smooth, usually only one of the pair developing, with spongy fibrous mesocarp and a papery endocarp
Morphology Reproductive morphology Seeds
Seeds ovate, planoconvex, pubescent, with a tuft of hairs at one end.
Distribution
Three species in Africa, Arabia and southern and south-eastern Asia, introduced elsewhere in the tropics.
[FSOM]

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.

Morphology General Habit
Erect shrubs with large succulent leaves
Morphology Reproductive morphology Inflorescences
Inflorescences terminal and extra-axillary, pedunculate, with several clusters of umbelliform cymes
Morphology Reproductive morphology Flowers Corolla
Corolla c.3 cm in diam., lobed for c.2/3 of its length
Morphology Reproductive morphology Flowers Corona
Corolline corona absent
Morphology Reproductive morphology Flowers Gynostegium
Gynostegial corona lobes laterally compressed with an upturned spur at the base, radiating out from the gynostegium to which they are adnate for their entire length
Morphology Reproductive morphology Flowers Pollinarium
Pollinaria with oblong, slightly winged corpuscula and short, cylindrical translator arms; pollinia flattened, pear-shaped
Morphology Reproductive morphology Flowers Gynoecium Style
Style head pentagonal, depressed or raised slightly above the top of the anthers
Morphology Reproductive morphology Seeds
Follicles large, ovate or subglobose, smooth, usually only one of the pair developing, with spongy fibrous mesocarp and a papery endocarp Seeds ovate, planoconvex, pubescent.
Distribution
Three species in Africa, Arabia and southern and SE Asia, introduced elsewhere in the tropics.
[FZ]

George R. Proctor (2012). Flora of the Cayman Isands (Second Edition). Royal Botanic Gardens, Kew

Morphology General Habit
Shrubs or small trees; leaves broad, opposite and nearly sessile
Morphology Reproductive morphology Flowers
Flowers in terminal or axillary umbellate cymes; calyx with several to many glands within at the base; corolla 5- cleft with broad lobes not reflexed; scales of the corona 5, fleshy, attached to the stamen- tube, lobed or toothed above and short-spurred at the base
Morphology Reproductive morphology Flowers Pollinia
Pollinia pendulous from the anther-cells
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma sharply 5-angled
Morphology Reproductive morphology Seeds
Follicles thick, blunt, and rather rough.
Distribution
A genus of 6 species occurring in tropical Africa and Asia.
[Cayman]

Sources

  • Flora Zambesiaca

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

    • Flora of Somalia
    • 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
  • Flora of the Cayman Islands

    • Flora of the Cayman Islands
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Herbarium Catalogue Specimens

  • 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