AFRICAN

ORCHIDS

Rangaeris amaniensis (Kraenzl.) Summerh., Kew Bull. 4: 438 (1949).
Homotypic Synonyms:
Listrostachys amaniensis Kraenzl., Bot. Jahrb. Syst. 43: 397 (1909).
Leptocentrum amaniense (Kraenzl.) Schltr., Beih. Bot. Centralbl. 36(2): 112 (1918).
Heterotypic Synonyms:
Cyrtorchis cufodontii Chiov., Miss. Biol. Borana, Racc. Bot., Angiosp.-Gymnosp.: 335 (1939).
Angraecum cufodontii (Chiov.) Chiov. ex Chiarugi, Webbia 8: 2 (1951).
Description:
Pseudobulb/stem: 6-18 in. (15-45 cm) long. The woody stem may be curved or pendent when old and very long, but usually are erect. sometimes branch from the lower, leafless part of the stem. Although leafless, the lower part of the stem remains covered by the old leaf bases. Leaves: 1.6-5.0 in. (4-12 cm) long by 0.4-1.0 in. (1.0-2.5 cm) wide. Numerous arching to spreading, narrowly oblong or strap-shaped leaves are closely spaced and distichously arranged in two rows along the upper part of the stem. They are leathery, have two unequal and rounded lobes at the tip, and are longitudinally folded to be U-shaped or shallowly V-shaped in cross section. Inflorescence: 2.4-4.0 in. (6-10 cm) long. The spreading to arching flower spikes emerge from the stem along the leaf axils. Flowers are carried in a raceme along almost the entire length of the spike, each one with a pedicellate ovary that is 0.8-1.2 in. (2-3 cm) long and a floral bract that is 0.2-0.3 in. (0.5-0.65 cm) long. Flowers: 5-13 per inflorescence. The spreading, fragrant blossoms are attractively spaced along the spike and are held to all face the same direction. The flowers are white with green on the outer surface and the spur, but they fade to yellow or pale orange with age. The flowers, which are variable in size, have sepals that are lanceolate, taper to a sharply pointed tip, may be spreading or recurved, and measure 0.4-1.0 in. (1.0-2.5 cm) long by 0.1-0.2 in. (0.25-0.55 cm) wide. The spreading petals are similar in shape but slightly smaller and are more or less reflexed toward their tips. The rather obscurely 3-lobed lip is 0.4-1.0 in. (1.0-2.5 cm) long by 0.2-0.4 in. (0.5-1.1 cm) wide across the rounded lateral lobes near the middle. The midlobe is lanceolate and tapers to a sharply pointed tip which curves downward or even toward the rear. There is a long, slender, pendent spur at the base of the lip that is 3-6 in. (7.5-16.0 cm) long. The rather short, broad column is about 0.2 in. (0.5 cm) long.
Habitat:
The epiphytic or lithophytic orchid is found in Eritrea, Ethiopia, Kenya, Tanzania, Uganda, and Zimbabwe. It is reportedly widespread in central Kenya. Plants appear to occupy two very different habitats and may be found in montane forest or open woodland at 3500-8550 ft. (1060-2600 m).
Cultivation:
Read more of Cultivation of Rangaeris amaniensis (Kraenzl.) Summerh.,
Notes:
Stewart & Campbell (1996) reported that these plant bloom in spring and autumn, while Isobyl & Eric La Croix (1997) reported flowering in summer.
Distribution:
S. Ethiopia to Zimbabwe
References:
Hamilton, R. 1988. When does it flower? 2nd ed. Robert M. Hamilton, 9211 Beckwith Road, Richmond, B. C., Canada V6X 1V7. la Croix, I. and E. la Croix. 1997. African orchids in the wild and in cultivation. Timber Press, Portland, OR. Stewart, J. and B. Campbell. 1996. Orchids of Kenya. Timber Press, Portland, OR. WCSP (2017). 'World Checklist of Selected Plant Families. 17.03.2017; http://apps.kew.org/wcsp/
Images:
Click on each image to see a larger version. 

      In culture          In culture         In culture              In culture         In culture          In culture             In culture
rangaeris amaniensis 01 rangaeris amaniensis 02 rangaeris amaniensis 03 rangaeris amaniensis 04 rangaeris amaniensis 05 rangaeris amaniensis 06 rangaeris amaniensis 07
Photograph ©Leo Klemm. Image used with kind permission. Photograph ©Leo Klemm. Image used with kind permission. Photograph ©Leo Klemm. Image used with kind permission. Photograph ©Leo Klemm. Image used with kind permission. Photograph ©Leo Klemm. Image used with kind permission. Photograph ©Leo Klemm. Image used with kind permission. Photograph ©Leo Klemm. Image used with kind permission.

            Habitat/In situ
rangaeris amaniensis in situ
Photograph©Backmann. Swiss Orchid Foundation at the Herbarium Jany Renz Image used with kind permission.