Base de données des plantes d'Afrique


Bulbophyllum falcatum (Lindl.) Rchb. f.
Famille : ORCHIDACEAE
Informations sur le genre : Bulbophyllum
Basionyme : Megaclinium falcatum Lindl.
 
 
Statut
Statut pour TA : accepté, NF (présent)
 
Synonyme(s) homotypique(s)
 Bulbophyllum falcatum (Lindl.) Rchb. f. var. falcatum
 Megaclinium falcatum Lindl. (1826)
 
Synonyme(s) hétérotypique(s)
=Megaclinium endotrachys Kraenzl. (1905)
=Bulbophyllum dahlemense Schltr. (1919)
=Bulbophyllum hemirhachis (Pfitzer) De Wild.
=Megaclinium hemirhachis Pfitzer (1908)
=Bulbophyllum leptorrhachis Schltr.
=Bulbophyllum oxyodon Rchb. f.
=Bulbophyllum ugandae (Rolfe) De Wild.
=Megaclinium ugandae Rolfe (1913)
 
Taxons infra-spécifiques
Bulbophyllum falcatum var. velutinum (Lindl.) J.J. Verm.
Bulbophyllum falcatum var. bufo (Lindl.) J.J. Verm.
Bulbophyllum falcatum (Lindl.) Rchb. f. var. falcatum
 
Ecologie et distribution
Afr. Trop.
Biologie : Epiphytic or lithophytic herb; pseudobulbs 0,5-5 cm apart, 2-leaved, ovoid, 3-4-angled, 1-7x0,6-2 cm; leaves oblong-lanceolate, 2-21x0,5-3 cm, petiole 0,1-2,5 cm long; inflorescence 7-40 cm long, 8-60-flowered; peduncle 1-16 cm long, erect to pendulous; rachis terete to widened-flattened, blade-like, 2-17 cm long, up to 1,8 cm wide, erect or pendulous, edges sharp to obtuse (when flattened); bracts triangular, 1,3-6,2x1-3,5 mm; flowers distichous, facing into rachis, fully open, yellowish to greenish, marked purple, or reddish purple; sepals oblong-spathulate, 3,5-6x2,2-3,5 mm, margins fleshy; petals linear or oblong, recurved or not, 1,5-3x1 mm; lip recurved, ovate, fleshy, 0,7-4x0,5-3 mm.
Ecologie : Rain-forest; forest with Chrysobalanus icaco, Syzygium guineense; forest with Gilbertiodendron dewevrei; mangrove; littoral forest; secondary forest; relict forest patches in savanna; woodland; Citrus and coffee plantations; rocks; growing with B. capituliflorum, moss and lichens; on, e.g. Nauclea diderrichii, Gilbertiodendron; 0-1900 m alt.
  Variable in hairiness of flowers, shape of petals (used to distinguish the varieties).
  Bioko/Fernando Poo (Fragm. Florist. Geobot. 43/1: 18, 20, 22, 1998); S. Tomé, Príncipe (Acta Bot. Gall. 147: 170, 2000; Bothalia 41: 63, 2011), Annob?n (Phytotaxa 171: 13, 2014, as B. velutinum).
  Vermeulen (1987) distinguishes 3 vars., the concept followed below. Keys and descriptions of these figure in Vermeulen, o.c.: 123; and in, e.g., Cheek & al., Pl. Kupe: 455, 2004; and I. & E. la Croix, o.c.: 165-166: - var. falcatum [syn.: Megaclinium hemirhachis Pfitzer in Orchids, Berlin 2: 135, 1908; Bulbophyllum hemirhachis (Pfitzer) De Wild.; the epithet “hemirhachis” is cited as “hernirhachis” in World Checklist of Selected Plant Families, Orchidaceae, Roy. Bot. Gard., Kew; we do not understand why the epithet was “corrected”; Megaclinium oxyodon Rchb. f.; M. ugandae Rolfe], with rachis flattened, flowers yellowish white or with dark red spots, tips of petals rounded, thickened; in lowland or sub-montane forest; - var. bufo (Lindl.) J. J. Verm. 1986 (and Govaerts 1996) [syn.: Phyllorkis bufo (Lindl.) Rchb. f.; Bulbophyllum seretii De Wild. nov. spec. (Megaclinium seretii “nom. nov.” De Wild. = nom. alt., Melbourne code § 36. 2, 2011) in Bull. Jard. Bot. Etat, Brux. 5: 177, 1916], with rachis flattened, flowers whitish, purple-spotted, and median sepal spathulate, 6 mm long, petals 1,5-2,5 mm long, tips not thickend, acute; in lowland forest up to 800 m alt.; - var. velutinum (Lindl.) J. J. Verm. [syn.: Phyllorkis velutina (Lindl.) Kuntze; P. rhizophorae (Lindl.) Kuntze; Megaclinium melanorrhachis Rchb. f.; Bulbophyllum velutinum (Lindl.) Rchb. f., incl. var. melanorrhachis (Rchb. f.) Perez-Vera; Megaclinium minutum Rolfe, incl. var. purpureum De Wild.; M. millenii Rolfe; M. arnoldianum De Wild.; M. lasianthum Kraenzl.; Bulbophyllum brixhei De Wild., nov. spec. (Megaclinium brixhei “nom. nov.” De Wild. = nom. alt. Melbourne code § 36.2, 2011) in Bull. Jard. Bot. Etat Brux. 5: 174, 1916; B. solheidii De Wild., nov. spec. (M. solheidii De Wild. “nom. nov.” De Wild.), ibid.: 178; M. lanuriense De Wild.; Bulbophyllum kewense Schltr., incl. var. purpureum De Wild.; B. fractiflexum Kraenzl.; B. simonii Summerh.] with rachis flattened or not, flowers dark red with base of lip yellow, or yellow, “most opening at the same time, set closely together, facing the same way. This is by far the most attractive variety. The yellow form is sometimes known as var. flavum, but it has not been botanically described as such” (I. & E. la Croix, Afric. orchids wild & cult.: 166, 1997); with tips of petals ± acuminate, not thickened; in forest, mangrove. B. velutinum var. melanorrhachis applies to specimens with small flowers (sometimes considered a distinct species, B. melanorrhachis), whereas var. velutinum applies to such with large flowers.
 
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