Asteraceae
Berkheya

Berkheya setifera DC.

First published in Prodr. 6: 507 (1838)
This species is accepted
The native range of this species is S. Tropical & S. Africa.

Descriptions

Compositae, G. V. Pope. Flora Zambesiaca 6:1. 1992

Morphology General Habit
A perennial herb up to c. 120 cm. tall, from a stout woody rootstock (? with root tubers).
Morphology Stem
Stems annual single erect ± branched above, glabrous or thinly pilose-araneose.
Morphology Leaves
Leaves mostly basal with 1-several cauline leaves diminishing in size to the stem apex, not decurrent on the stem; basal leaves ascending-subrosulate, 10–45 x 4–12 cm., obovate to oblanceolate, apex rounded or subobtuse, base ± long-tapering becoming petiole-like, dilated and somewhat stem clasping, margins subentire to dentate or sinuate-dentate, upper surface and margins beset with patent stramineous spine-like bristles 2–7 mm. long, the longest at tooth apices, lower surface indumentum as for stem; cauline leaves few, becoming bract-like at the stem apex.
Morphology Reproductive morphology Inflorescences Capitulum
Capitula radiate, solitary and terminal on the branches or several ± clustered, 3–6 cm. in diam. across the expanded rays.
Morphology Reproductive morphology Inflorescences Bracts Phyllaries
Phyllaries from c. 4 mm. long in the outer series to c. 12 mm. long in the inner series, mostly c. 1 mm. wide at the base and linear-tapering to a spinescent apex, spinescent-ciliate on the margins and pilose-araneose on the back; the inner ± unarmed.
Morphology Reproductive morphology Flowers Receptacle
Receptacular alveolae margins with spinescent setae to c. 6 mm. long.
Ray
Rays yellow, mostly 12–20 x 1.5–4 mm.
Morphology Reproductive morphology Flowers Florets
Disk-florets numerous; limb yellow, c. 13 mm. long from the tubular lower half; achenes 2–3 mm. long, turbinate, 8–10-ribbed, hispid-strigose; pappus 2–3-seriate, of narrow paleaceous barbellate setae, 8–10 mm. long. Rays yellow, mostly 12–20 x 1.5–4 mm.
Disc
Disk-florets numerous; limb yellow, c. 13 mm. long from the tubular lower half; achenes 2–3 mm. long, turbinate, 8–10-ribbed, hispid-strigose; pappus 2–3-seriate, of narrow paleaceous barbellate setae, 8–10 mm. long.
[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

  • 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