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

By J. C. Manning and P. Goldblatt

Abstract

<p>We recognize two new species of Asteraceae from the winter rainfall belt of South Africa and reduce a third to synonomy. <em> Senecio </em><strong>speciosissimus</strong> sp. nov. has been confused with  <em>S. coleophyllus </em>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:  <em>S.</em> <strong>speciosissimus</strong> occurs in the Hottentots Holland and Franschhoek Mountains of the southwestern Cape, whereas <em>S.  coleophyllus</em> is endemic to the Riviersonderend Mountains.  <em>Chrysocoma</em> <strong>hantamensis</strong> 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 <em>Oncosiphon</em>, <em>O. africanum</em> (PJ.Bergius) Kallersjo and  <em>O. glabratum </em>(Thunb.) Kallersjo. reveals that only one species can be maintained, and <em>O. glabratum</em> is accordingly reduced to synonomy in <em>O. africanum</em>.</p

Topics: 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, General. Including nature conservation, geographical distribution, QH1-199.5
Publisher: AOSIS
Year: 2005
DOI identifier: 10.4102/abc.v35i1.369
OAI identifier: oai:doaj.org/article:b1e32ad07be3477daeb003d0c76bb3a8
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