Kalanchoe darainensis

Klein, David-Paul, Shtein, Ronen, Nusbaumer, Louis & Callmander, Martin W., 2021, Kalanchoe darainensis (Crassulaceae), a new species from northeastern Madagascar, Candollea 76, pp. 117-123 : 119

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 <1/10 of their length, non-papillose; anthers partially to fully included, longer than wide, dressed with ± spherical connective glands .......................................................................... 6

6. Plants perennial; leaves 3- to 5-partite, occasionally bilobed and petiolulate; leaf or leaflet blades oblong to linear; margins obtusely crenate-sinuate; petals strongly acuminate with an acumen 3.5–4.5 mm long; styles much longer than carpels .................................... K. chapototii

6a. Plants annual; leaves 1- to 3-partite, if lobed not bi-lobed nor petiolulate; leaf or leaflet blades ovate to lanceolate; margins entire to minutely crenate-sinuate; petals acuminate with an acumen 1.2–2 mm long; styles much shorter than carpels ................................................................. 7

7. Leaves unlobed; leaf or leaflet blades ovate, apically subobtuse; styles> 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