Kalanchoe decumbens , K. krigeae , and K. rotundifolia, 1763

Smith, Gideon F. & Figueiredo, Estrela, 2023, Kalanchoe krigeae (K. subg. Kalanchoe; Crassulaceae subfam. Kalanchooideae), a new, small-growing species from northeastern South Africa split off from K. rotundifolia, Phytotaxa 603 (3), pp. 280-288 : 282

Key to distinguish among Kalanchoe decumbens, K. krigeae, and K. rotundifolia

1. Leaf consistency soft; adaxial surface of corolla lobes uniformly vividly deep red to orange-red; corolla lobes ± ovate to elliptic. .......................................................................................................................................................................... Kalanchoe decumbens

1’. Leaf consistency firm; adaxial surface of corolla lobes uniformly apricot-orange, bright orange, or red, sometimes orange-infused if red; corolla lobes generally narrowly elliptic .................................................................................................................................2

2. Leaves lanceolate-cymbiform to narrowly oblong-terete; corolla lobes often sigmoidally down- and upcurved, apically roundedacute to acute ......................................................................................................................................................... Kalanchoe krigeae

2’. Leaves oblong-elliptic to elliptic-obovate to round; corolla lobes ± flat, straight, apically attenuate-acute ....................................... ........................................................................................................................................................................ Kalanchoe rotundifolia