Dimorphotheca

Moench

Methodus, 585. 1794.

Common names: African daisy Cape marigold
Etymology: Greek di- , two, morphe, shape, and theca, case or container, alluding to two forms of cypselae within each head
Treatment appears in FNA Volume 19. Treatment on page 380. Mentioned on page 30, 379.
Revision as of 21:39, 27 May 2020 by imported>Volume Importer

Annuals [perennials, subshrubs, shrubs], 5–40[150+] cm. Stems procumbent to erect [prostrate], glabrous or arachnose to piloso-hirtellous and/or stipitate-glandular. Leaves ± sessile or petiolate; blades oblong or oblanceolate to linear, margins entire or dentate [pinnately lobed], faces sparsely arachnose and/or stipitate-glandular. Heads borne singly. Involucres campanulate to hemispheric or broader, 5–20+ mm diam. Phyllaries 15–21 in 2(–3) series, lanceolate to lance-linear. Receptacles flat to conic. Ray florets 10–21+ in ± 1 series; corollas usually yellow to orange or white, sometimes purplish abaxially and/or at bases or apices, laminae oblong-elliptic to oblanceolate. Disc florets 15–50+, bisexual, all or mostly fertile (inner sometimes functionally staminate); corollas whitish or yellow, red, or purplish, tubes much shorter than ± campanulate throats (lobes sometimes with terete or dilated appendages). Cypselae (ray) triquetrous-prismatic to clavate, ± tuberculate or ridged; (disc) compressed, often winged, ± smooth. x = 9.

Distribution

Introduced; s Africa.

Discussion

Species 7–18+ (2 in the flora).

Selected References

None.

Key

1 Ray corollas mostly yellow to orange adaxially Dimorphotheca sinuata
1 Ray corollas mostly whitish adaxially Dimorphotheca pluvialis