Original Research

Two new species of Asteraceae from Northern and Western Cape, South Africa and a new synonym

J. C. Manning, P. Goldblatt
Bothalia | Vol 35, No 1 | a369 | DOI: https://doi.org/10.4102/abc.v35i1.369 | © 2005 J. C. Manning, P. Goldblatt | This work is licensed under CC Attribution 4.0
Submitted: 25 August 2005 | Published: 29 August 2005

About the author(s)

J. C. Manning, Compton Herbarium. South African National Biodiversity Institute, South Africa
P. Goldblatt, B.A. Krukoff Curator of African Botany, Missouri Botanical Garden, United States

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Abstract

We recognize two new species of Asteraceae from the winter rainfall belt of South Africa and reduce a third to synonomy.  Senecio speciosissimus sp. nov. has been confused with  S. coleophyllus Turcz. in the past but is distinguished by its taller stature, larger and more finely serrated leaves, and congested synflorescences containing (6-)l 5-40 flowerheads. The two species are also geographically separated:  S. speciosissimus occurs in the Hottentots Holland and Franschhoek Mountains of the southwestern Cape, whereas S.  coleophyllus is endemic to the Riviersonderend Mountains.  Chrysocoma hantamensis sp. nov. is a distinctive new species endemic to the Bokkeveld and Roggeveld Plateaus. It is distinguished by its resprouting habit. 3-5-fid leaves and large capitula, 12-15 mm in diameter, with lanceolate. 3-veined involucral bracts, the largest 9 - 1 0 x 2 mm. Investigation of the variation in leaf morphology of the two radiate species of Oncosiphon, O. africanum (PJ.Bergius) Kallersjo and  O. glabratum (Thunb.) Kallersjo. reveals that only one species can be maintained, and O. glabratum is accordingly reduced to synonomy in O. africanum.


Keywords

Asteraceae; Cape Floral Region. <i>Chrysosoma hantamensis</i> J.C.Manning & Goldblatt; new species; Oncosiphon; Senecio speciosissimus J.C. Manning & Goldblatt; South Africa; sp. nov.; systematics

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