Key to Kalanchoe darainensis and allied species 1. Plants perennial, soboliferous; indumentum absent to partial; leaves ovate-oblong, obovate or orbicular, never lobed; flowers golden yellow or scarlet red .................. 2 1a. Plants predominantly annual, non-soboliferous; indumentum partial to complete; leaves ovate-lanceolate to linear, often lobed, rarely bi-lobed; flowers whitish to golden yellow .......................................................................... 4 2. Flowers yellow, few (7 to 10); leaves subsessile; indumentumsparsely glandular, restrictedtostemandpeduncle. ................................................................. K. globulifera 2a. Flowers scarlet, numerous; leaves petiolate to subsessile; indumentum absent or partially densely glandular, restricted to leaves, stem and peduncle ........................ 3 3. Indumentum absent; leaf blades ovate-oblong, apically obtuse to acute; inflorescences numerous, terminal and axillary, many-flowered thyrses ............. K. blossfeldiana 3a. Indumentum densely glandular, restricted to leaves, stem and peduncle; leaf blades ovate, elliptic to orbicular, apically rounded-obtuse; inflorescences single, terminal, many-flowered dichasial cymes .............. K. darainensis 4. Sepals and corolla especially thick and fleshy; glandular hair thick-stalked, extends to the upper part of the stem, young leaves, inflorescence, and sepals; flowers whitish cream-yellow ........................................... K. pareikiana 4a. Sepals and corolla not thick or fleshy; glandular hair slender-stalked, complete, i.e. extends from the base of the stem to the petals; flowers golden yellow ............... 5 5. Leaves alternate basally, decussate higher up; petals suboblong, retuse, i.e. rounded-obtuse and notched; filaments 6.5–8.5 mmin length, freefor> ⅓ of their length, papillose; anthers fully exserted, wider than long, lacking connective glands ............................................. K. briquetii 5a. Leaves decussate; petals ovate, apically acute to acuminate; filaments 10–13 mmin length, freefor 2 times shorterthan carpel ...... K. boisii 7a. Leaves 3-partite; leaf or leaflet blades ovate-lanceolate, apically acuminate-acute; styles <2 times shorter than carpel ...................................................... K. antennifera

Published as part of Klein, David-Paul, Shtein, Ronen, Nusbaumer, Louis & Callmander, Martin W., 2021, Kalanchoe darainensis (Crassulaceae), a new species from northeastern Madagascar, pp. 117-123 in Candollea 76 on page 119, DOI: 10.15553/c2021v761a12, http://zenodo.org/record/5645196