Key to genera

1Climbing shrubs; stems dark, densely lenticellate; leaves ovate or elliptic, acute or ± blunt, 1-4.5(-6.3) × 0.6-2.5(-3.3) cm with thickened margins; calyx tube glabrous; corolla an entire or lobed ringSynaptolepis
1Erect herbs, shrubs or trees2
2Trees to 15 m, or if sometimes shrubby or subshrubby then leaves wider, 1.5-6 cm wide3
2Herbs, shrubs or subshrubs, often ± ericoid and leaves only rarely up to 2(-3.2) cm wide6
3Calyx tube glabrous4
3Calyx tube pubescent to woolly6
4Flowers in terminal pedunculate umbels, the pedicels without bracts or bracteoles; trees or shrubs 3-10 m; calyx tube wider, 1.5-3.5 mm widePeddiea
4Flowers in axillary (1-)2-4-flowered fascicles, several-flowered cymes or solitary, or if appearing terminal and subumbellate then calyx tube slenderSynaptolepis
5Flowers pinkish; leaves up to 6 cm wideDais
5Flowers yellow; leaves up to 2(-3.2) cm wideGnidia
6Ericoid shrub with spiciform inflorescences of numerous solitary or paired axillary flowers along upper part of branches; calyx tube glabrous; stamens as many as the calyx lobesStruthiola
6Inflorescences not as above, often bracteate heads; calyx tube glabrous to woolly; stamens twice as many as the calyx lobes7
7Calyx tube inflated at the base, 3-5 mm, not articulated; ericoid shrub with crowded leaves c. 4 mm and numerous 4-flowered clusters terminating short apical branchletsPasserina
7Calyx tube not inflated at the base, usually longer, mostly articulated; ericoid or not; flowers mostly numerous in bracteate headsGnidia

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-24

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2024). Flora of Zimbabwe: Thymelaeaceae: Key to genera., retrieved 25 February 2024

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