DECUMBENS Compton, 1967
Type : Compton 29407
Distribution : Southeastern Eswatini, Africa.
Description by Compton (in J. S. African Bot. 33: 294. 1967) :
Branches spreading horizontally becoming erect and ending in an erect inflorescence.
Leaves mainly on the horizontal part of the stem, succulent, numerous, crowded, scattered, seldom in pairs, erect, narrowly lanceolate-clavate, obtuse, up to ca 35 mm long x 5 mm wide above the middle, tapering gradually to the narrow insertion on the stem.
Inflorescence erect with a few pairs of reduced leaves near its base, mostly bare, up to ca 30 cm high, ending in a small subcapitate erecte panicle. Pedicels ca 3 mm long.
Flowers : Sepals free to the base, ca 3 mm long x 1 mm wide. Corolla ca 1 cm long, ca 4 mm wide at its ventricose base, narrowing to a small throat at which the anthers and stigmas appear, the lobes patent, ovate, obtuse, ca 6 mm long x 3 mm wide, cinnabar-red. Carpels free to the base, ca 5 mm long, tapering gradually to minute capitate stigmas, ovules numerous.
Kalanchoe decumbens is related to K. rotundifolia. While Compton had published it as a species, it was subsequently included in the synonymy of K. rotundifolia, recently reinstated as a species by Gideon F. Smith in Bradleya 39, p. 163-171. 2021. It is likewise related to K. waterbergensis, originally also considered a form of K. rotundifolia.