Origin and Habitat: Kalanchoe rebmanniiSN|31679]]SN|31679]] is native of the Central Highlands of Madagascar, near Fianarantsoa.
Type locality: Isorana road, along a track a few km from Fianarantsoa, on the village of Halalava.
Habitat and ecology: This species grows on very wet, steep granite cliff, facing south-west, on black humus plates on which grows a vegetation consisting in particular of succulents both rupicolous and hygrophilous (Coleochloa, Aloe, orchids, etc.).

• Kalanchoe rebmannii Desc.

Description: Kalanchoe rebmannii is an erected small succulent shrubby-herb 10-15 cm tall, up to 20 cm in diameter, usually with less than 7 branches (with a maximum of 10), densely covered by white glandular hairs. The nodding, bright red flowers borne in clusters around the tips of the flowering stems are very beautiful. Soon after the publication of the species, plants were disseminated throughout the grower community, and it has become a highly prized ornamental plant.
Derivation of specific name: Kalanchoe rebmanniiSN|31679]]SN|31679]] was named in honour of Norbert Rebmann who first discovered the plant.
Trichomes (multicellular glandular hairs): 0.2-0.3 mm long, translucent terminated by a small gland globular, covering all organs: young stems, leaves, inflorescence axis, pedicels and calyxes.
Stems Cylindrical, erect to creeping, 10-15 cm long, 2-4 mm wide. The young ones reddish and densely glandular hairy, older ones hairless with a fine brownish bark. Stems easily emit aerial roots at the nodes.
Leaves: In opposite pairs, decussate, thick, green, concolorous. Petiole, flattened (not-cylindrical) 5-7 mm long, 2-4mm wide. Lamina elliptical, fairly regular, base cunetae, 22-27 mm long, 15-17 mm wide, flat on both sides, densely covered by glandular hairs. Margins crenate, tip rounded
Inflorescence: Terminal, cymose erect widening. At the end of flowering, some bulbils appears in the inflorescence. These bulbils can develop new stems and roots.
Flowers: Pendulous, cylindrical-tubular 23-25 ​​mm long red and yellow coloured. Pedicel, bent 4-5 mm long. Calyx 7-7.5 mm long, 6-7 mm in diameter, yellowish-green, fully and densely glandular inside and outside, tube very short, 1-1.5 mm high. Corolla, densely covered by glandular hairs, quadrangular 22-24 mm long, red, the lower part of the tube about 5-6 mm long, 3 mm wide, the upper part of tube 13-15 mm long and up to 5 mm wide, the lobes erect, ovate, cuneate, slightly narrowed at the base, obtuse, apiculate, about 6 mm long, 3.5-4 mm wide, to narrow sinus. Stamens 20-21 mm long, unequal inserted in the lower fifth of corolla tube, exerted. Filaments white. Anthers elliptical of ± 1 mm long. Carpells barely attached at the base (not fused) 5-6 mm long, tapered at tip, 8-9 mm long.
Blooming season (in habitat): August to early September.
Related species: Kalanchoe rebmanniiSN|31679]]SN|31679]] is similar to Kalanchoe campanulata, but shorter with branches, leaves and flowers covered with glandular hairs, flattened petioles and carpels fused (not cylindrical).

Bibliography: Major references and further lectures
1) Bernard Descoings “Kalanchoe rebmannii, Crassulacée nouvelle de Madagascar” in J. Bot. Soc. Bot. France 33 : 29-32 (2006)
2) Boiteau P. & Allorge Boiteau L., 1995 - "Kalanchoe (Crassulacées) de Madagascar. Systématique, écophysiologie et phytochimie." Karthala, Paris, 1 vol. 252 p., 7 pl., 40 pl. coul., 24 cart.
3) Descoings B., 1997 - "Note sur quelques espèces nouvelles de Kalanchoe (Crassulaceae) de Madagascar." J. Bot. Soc. bot. France, 4, 79-89, pl. 1-5.
4) Descoings B., 2003 - "Kalanchoe. In : Illustrated Handbook of Succulent Plants : Crassulaceae." U. Eggli (éd.), Springer, Berlin, p. 143-181, 8 photos coul.
5) Descoings B., 2004 a - "Kalanchoe tenuiflora, Crassulacée nouvelle de Madagascar." Acta Bot. Gallica 151 : 233-237, 1 fig.
6) Descoings B., 2004 b - "Note sur les Kalanchoe (Crassulaceae) de Madagascar : deux espèces peu connues, K. laetivirens et K. sanctula." Succulentes 4 : 9-16, 9 photos.
7) Descoings B., 2005 a - "Crassulaceae madecassae novae." Soc. bot. Ardèche (éd.), Aubenas, 18 p., 4 pl. coul.
8) Descoings B., 2005 b - "Sur quelques Kalanchoe (Crassulaceae) hybrides de Madagascar." J. Bot. Soc. bot. France 30 : 3-18, 3 fig.
9) Descoings B., 2006 - "Le genre Kalanchoe (Crassulaceae): structure et définition." J. Bot. Soc. bot. France 33 : 3-28, 4 fig., 2 pl. coul.
10) Rauh W., 1995-1998 - "Succulent and xerophytic plants of Madagascar." Strawberry Press. Mill Valley, Californie (USA). 2 vol., 343 p. + 1011 fig. (1995), 385 p. + 1266 fig. (1998).

Cultivation and Propagation: Kalanchoe rebmanniiSN|31679]]SN|31679]] is a new small species that can provide some interest for fans, especially for its brilliant blooms, and thanks to its regenerative capacity. It easy to culture and makes an interesting blooming potted plant and is rewarding as indoor plant. It's grown primarily for its flowers. They'll even bloom in low light, making them good for indoor dish gardens. But the conditions of its culture must reflect its ecology: humus substrate, permanent water supply with high humidity levels.
Growth rate: Its growth rate has been described as 'slow'.
Potting mix: Use a soil based potting mixture with the addition of a small amount of coarse sand, pumice or lava grit to ensure good drainage. They grow best in clay pots for aeration and need drainage holes in the bottom. Setting the container on a dish filled with rocks or gravel provides extra drainage.
Exposure: Keep this plant out of strong, direct sunlight; although exposure to the morning sun is fine. The Kalanchoe is best kept in a shady setting. In the home should be grown in sunny window.
Repotting; Plants that are not to be discarded should be moved each spring into pots one size larger. The maximum pot size needed should be about 12 cm.
Watering: It needs moderate watering in autumn and spring while in summer it should be watered thoroughly and allowed to dry before watering again. In winter give only occasional watering (only when the plant starts shrivelling), but it will generally grow even in winter if given water. Avoid using cold water when watering plants because it could shock the plant.
Fertilization: From the end of spring to the beginning of autumn, feed the plant with a monthly dose of fertiliser. Pruned plants may be given a dose of full strength fertilising as a boost.
Frost resistance: This species grow well in normal room temperatures. It is native to Madagascar and will bloom at temperatures of between 15 and 16 degrees Celsius. Avoid temperatures below 5°C because they can kill the plant after a few hours.
Maintenance: Kalanchoes hold the blooms on for many weeks and after the blooms lose their luster, it is pruned back hard and given spell in the garden, it will flower again next season. Pinch off the faded flowers and continue to pinch the tips of the plants for a few more months to promote a bushy plant. If not pruned the plants become leggy and need to be replaced.
Pest and diseases: Whilst generally disease free, this species can be damaged by pest insects such as Otiorhynchus sulcatus (vine weevil) or mealybugs.
Propagation: It is propagated by removal of tip cuttings in spring and root them in 8 cm pots filled with a mixture of peat moss and sand. Pot pots in a warm position in bright filtered light. Water the mixture whenever the top 1-2 cm dries out. When roots have formed and new growth appears, move each young plant into a pot of standard mixture. It grows easily roots and new plants are ready within months.
Warning: Parts of Kalanchoe rebmanniiSN|31679]]SN|31679]] are poisonous if ingested. All members of Kalanchoe are toxic for livestock, birds and small animals.