Kalanchoe subg. Kitchingia (Baker, 1881) , Boiteau, 1947

Smith, Gideon F., Klein, David-Paul & Shtein, Ronen, 2021, A revision of the Malagasy Kalanchoe subg. Kitchingia (Crassulaceae subfam. Kalanchooideae): history, taxonomy, and nomenclature, Phytotaxa 507 (1), pp. 67-80 : 77

Key to the taxa of Kalanchoe subg. Kitchingia

1a. Plants small, epiphytic; leaves basally cuneate; corolla colour variable (red through orange to pinkish orange to yellow or yellowish green), generally more intensely coloured than in Kalanchoe peltata ; stamens generally included ...........2 [ Kalanchoe gracilipes ]

1b. Plants robust, terrestrial; leaves basally peltate; corolla colour variable (red through pink to yellowish pink or yellowish green or whitish), generally less intensely coloured than in Kalanchoe gracilipes ; stamens generally exserted ...........3 [ Kalanchoe peltata ]

2a. Leaf blade 10–30 mm long; margins subentire to deeply crenate, typically 7- to many-toothed; stem up to 2.5 mm in diameter ..... ................................................................................................................................................... Kalanchoe gracilipes var. gracilipes

2b. Leaf blade 5–6 mm long; margins deeply crenate to lobed, typically 3-toothed; stem up to 1.5 mm in diameter .............................. ................................................................................................................................................ Kalanchoe gracilipes var. microphylla

3a. Stems robust, often ± 4-angled; petiole distinctly widened basally, comparatively short; blade often weakly peltate, strongly crenate, lack violet-black blotching pattern; calyx and corolla ± 4-angled; sepals acute .................... Kalanchoe peltata var. stapfii

3b. Stems flexuose, cylindrical; petiole slightly widened basally, relatively long; blade strongly peltate to peltate-cordate, crenations shallow and wide, adorned with violet-black blotches; calyx and corolla rounded; sepals obtuse ...................................................4

4a. Leaves covered ad- and abaxially with simple, obtuse-tipped hairs; blade often cordate-deltoid ....................................................... .................................................................................................................................................. Kalanchoe peltata var. mandrakensis

4b. Leaves glabrous; blade ovate ............................................................................................................... Kalanchoe peltata var. peltata