Pteronia camphorata (L.)

Bello, A. O., Boatwright, J. S., Tilney, P. M., Van der Bank, M. & Magee, A. R., 2017, A taxonomic revision of the Pteronia camphorata group (Astereae, Asteraceae) *, South African Journal of Botany 113, pp. 277-287 : 280

3.3. Key to the species of Pteronia camphorata group

1a. Cypselas glandular or hairy (at least at the base) ……………………………………… remaining species of Pteronia .

1b. Cypselas glabrous:

2a. Leaves opposite, glabrous, somewhat succulent; corolla tube glabrous; pappus 2-seriate; cypselas obclavate, ≥ 6 mm long.............................................................................. 3. P. cederbergensis .

2b. Leaves alternate, ciliate to densely setose, coriaceous; corolla tube sparsely to densely pubescent; pappus uniseriate; cypselas ovate or elliptic, ≤ 4 mm long:

3a. Involucral bracts with entire margins, apices long acuminate; cypselas isodiametric, marginal ribs prominent, white or cream...…….........…............................................................ 2. P. camphorata .

3b. Involucral bracts with serrate margins, apices acute to short acuminate; cypselas dorsoventrally flattened, marginal ribs only slightly prominent, brownish ………………………..……….…… 1. P. aspera .