Base de données des plantes d'Afrique


Dioscorea baya De Wild.
Protologue : Ann. Mus. Congo Belge. Bot., Ser. 5 3: 357 (1912) 
Informations sur le genre : Dioscorea
 
 
Statut
Statut pour TA : accepté, NF (présent)
 
Synonyme(s) homotypique(s)
 Dioscorea baya De Wild. var. baya (1912)
 
Synonyme(s) hétérotypique(s)
=Dioscorea baya var. subcordata De Wild.
 
Taxons infra-spécifiques
Dioscorea baya var. kimpundi De Wild.
Dioscorea baya De Wild. var. baya (1912)
 
Ecologie et distribution
Afr. Trop.
Biologie : Tuber large, covered by a woody plate, with woody roots from crown and with prickles to 1 cm long, glabrous; stems perennial, right-twining, to 30 m long, 1-2 cm Ø, with stout brown or black curved prickles to 1 cm long at base, glabrous, woody with age; bulbils absent; leaves usually opposite; petiole 2-4,5 cm long; blade ovate or elliptic, to 6-9x4,5-6 cm, base rounded, apex to 1 cm long, thickened; cataphylls on basal stem (to 8 m height) stipule-like; inflorescence spicate, flowers sessile; male spike simple, flowers falling after anthesis, in var. baya densely flowered, 2-5 cm long, axis hidden by flowers, in var. kimpundi laxly flowered, 5-8 cm long, axix visible between flowers; capsule 1,5-2,3x2,5-3,8 cm, pendent to patent; seeds winged all round.
Ecologie : Swamp and seasonally flooded sedge meadow; rain-forests; also in open areas; persists in areas of disturbance; old termite mounds; forest regrowths; wet, humus-rich soil; graphitic, schistose soil; secondary forests with Musanga; 200-c. 1500 m alt.
  Tubers edible.
  • MAGWÉ-TINDO J., J.J. WIERINGA & AL. (2018). Guinea yam (Dioscorea spp., Dioscoreaceae) wild relatives identified using whole plastome phylogenetic analyses Taxon 67(5): 910
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