Base de données des plantes d'Afrique


Cyrtorchis arcuata (Lindl.) Schltr.
Famille : ORCHIDACEAE
Informations sur le genre : Cyrtorchis
Basionyme : Angraecum arcuatum Lindl.
 
 
Statut
Statut pour SA : accepté, NF (présent)
Statut pour TA : accepté, NF (présent)
 
Synonyme(s) homotypique(s)
 Angraecum arcuatum Lindl. (1836)
 Listrostachys arcuata (Lindl.) Rchb. f.
 Cyrtorchis arcuata (Lindl.) Schltr. subsp. arcuata
 Angorchis arcuata (Lindl.) Kuntze
 
Synonyme(s) hétérotypique(s)
=Cyrtorchis arcuata subsp. variabilis Summerh.
=Cyrtorchis arcuata var. variabilis (Summerh.) Geerinck
=Listrostachys maialis A. Chev. (1920)
=Listrostachys acuminata Rolfe (1897)
=Cyrtorchis acuminata (Rolfe) Schltr. (1918)
=Cyrtorchis arcuata subsp. leonensis Summerh.
=Cyrtorchis sedenii (Rchb. f.) Schltr.
=Angraecum sedenii (Rchb. f.) G. Nicholson
=Listrostachys sedenii Rchb. f. (1878)
=Cyrtorchis bracteata Schltr. (1915)
 
Taxons infra-spécifiques
Cyrtorchis arcuata (Lindl.) Schltr. subsp. arcuata
Cyrtorchis arcuata subsp. whytei (Rolfe) Summerh.
 
Ecologie et distribution
Afr. Trop.
Biologie : Sturdy epiphytic or lithophytic herb often forming large clumps; stem erect, woody, 15-30-50 cm tall, with thick roots and distichous leaves; leaves c. 10, leathery, linear-oblong, 5-25x1-4 cm, yellowish green, apex unequally and obtusely 2-lobed; inflorescences 1-4, axillary or below leaves, 3-10 cm long, 3-12-flowered; bracts ovate, > 1,5 cm long, thin, dry, conspicuous; pedicel and ovary curved, c. 4 cm long; flowers waxy, white, aging orange; sepals lanceolate-acute, recurved, 1-1,6 cm long; petals and lip similar, but shorter; spur straight, slender, 3-5 cm long, greenish.
Ecologie : Rain-forest; semi-deciduous forest; mixed deciduous forest; relict forest patches in savanna; riverine forest; riverine forest-wooded savanna transition; Uapaca-Brachystegia woodland; high-rainfall Brachystegia woodland; lichen-covered rock; sclerophyllous formation on lava flow; swamp; cultivations; on tree trunks and main branches; on e.g., Syzygium cordatum; 0-3000 m alt. – “One of the most widespread orchids…and can be found on trees and rocks almost anywhere…where the natural vegetation is undisturbed, usually where the plants receive bright sunlight” (Stewart & Campbell, Orchids Kenya: 38, 1996).
  Subsp. whytei approaches C. chailluana in its large flowers but spur length different. In Ethiopia resembling C. erythraeae but flower bracts smaller and leaves longer in the latter. C. neglecta has also smaller bracts than C. arcuata.
  S. Tomé, Príncipe (Acta Bot. Gall. 147: 170, 2000; Bothalia 41: 64, 2011), Annabón (Phytotaxa 171: 24, 2014); S. Africa, Swaziland. Also in Eritrea, Angola ? – Not figuring in Fl. Gabon 37 (2004).
  Comprises 2 subspp. (cf. above): - subsp. arcuata [syn.: C. arcuata subsp. leonensis Summerh. and subsp. variabilis Summerh.; C. arcuata var. variabilis (Summerh.) Geerinck; C. bracteata Schltr.; C. sedenii (Rchb. f.) Schltr.; Listrostachys sedenii Rchb. f.; Angraecum sedenii (Rchb. f.) N. E. Br., 1882, and (Rchb. f.) G. Nicholson, 1884; Angorchis sedenii (Rchb. f.) Kuntze], flowers with spur 3-6 cm long, leaves < 2,5 cm wide; occurring most often in woodland and dry forest at 600-1600 m alt., throughout tropical Africa; as far as is known diploid or tetraploid; - subsp. whytei (Rolfe) Summerh. [bas.: Listrostachys whytei Rolfe; syn.: Cyrtorchis arcuata var. whytei (Rolfe) Geerinck; C. whytei (Rolfe) Schltr.; Angraecum whytei (Rolfe) De Wild.], with larger flowers with longer spur (6-10 cm), and leaves to 3,5 cm wide; occurring mainly in W Africa mostly in riverine forest and montane rain-forest, at 750-2000 m alt.; as far as is known hexaploid and even decaploid (giving its larger size).
  A beautiful species easy to grow. It may have been cultivated since 1837 (Orchids S. Afr. 43: 41, 2003). Subject to pests in the wild (Stewart in Caesiana 28: 92, 2007).
 
Plus d'info sur :
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voir d'autres informations sous Orchidées d'Afrique Centrale
 
Carte
carte afrique num 175925
 
Enregistrement n°175925
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