Key to the genera of the Byrsonima clade
1. Outer petals (the anterior-lateral pair) with deeply cupshaped limbs; fruit 4–15 mm in diameter or larger, the stone enclosed in a fleshy exocarp; anthers glabrous or bearing medifixed or submedifixed hairs, the apex without specially modified or directed hairs; vegetative hairs, if any, mostly medifixed or submedifixed (stellate in a few species), rarely basifixed or sub-basifixed.
1. Outer petals with the limbs flat or concave but not deeply cupshaped; fruit up to 3.5 mm in diameter, dry at maturity, the stone covered by a very thin, non-fleshy exocarp; anthers bearing few to many basifixed awns or hairs, the apical ones ± stiff and directed slightly forward; vegetative hairs, if any, mostly basifixed or sub-basifixed.
2. Petals all yellow, often with red claws; anthers with 2 (–4) stout apical awnlike hairs, these strongly differentiated from other hairs on stamen, if any; stamens 6–10; ovary with only 2 locules developed and containing ovules; fruit with only 2 locules, 1 or both containing seeds; sepals slightly to greatly accrescent in fruit.
2. Petals white and/or pink or red, or 4 white and the posterior pale yellow; anthers with apical hairs many, hardly or not at all different from other hairs on stamen; stamens 10; ovary with all 3 locules developed, and usually all fertile (except in some populations of B. fimbriata); fruit with 3 locules, 1–3 containing seeds; sepals not or hardly accrescent in fruit.