From Bot. Reg.
...the flower, which sometimes exceeds 3 inches in diameter, opens in the morning, when the sun shines, but closes in the afternoon and on the approach of rain: this it will continue to do for many days in succession. When fully expanded, a passing cloud will disturb it.
PlantList shows C. tragus Jacq. as unresolved whereas Tropicos lists it as the basionym of Dimorphotheca tragus (Jacq.) DC. 1837 and a synonym of Osteospermum acutifolium Norl.
PlantList and IPNI show Dimorphotheca tragus DC. 1838 which is listed in PlantList as a synonym of Osteospermum acutifolium (Hutch.) Norl. 1954 and of Dimorphotheca acutifolia Hutch. 1917 which PlantList says is the accepted name.
C. tragus Curtis is listed in PlantList as illegitimate and a synonym of Dimorphotheca sinuata DC. 1838.
Also published in Bot. Reg. 1: 28 in 1815. From Bot. Reg.
native of the Cape of Good Hope.
In Bot. Reg. there is discussion of 2 plants which are reluctantly placed in the same species. The first was published by Aiton Hortus Kew. 3: 271 in 1789. The second is listed as published by Jacq. in Pl. Rar. Hort. Schoenbr. 2: 14: 153 in 1797, by Curtis in Bot. Mag. 12: 408 in 1798 and by Persoon in Syn. Pl. (Persoon) 2: 492 in 1807. Later publications disagree as to whether the Curtis plant is different or the same as that of Jacq. or Aiton.
Other names listed in Bot. Reg.: