Zygia bisingula

Title

Zygia bisingula

Authors

Rupert C. Barneby

Scientific Name

Zygia bisingula L.Rico

Description

52. Zygia bisingula  L. Rico, Kew Bull. 49: 551, fig. 3, A-H. 1994. — VENEZUELA, Portuguesa, G. Aymard, F. Ortega and Desantiago 4445 ... 20 km E. of Biscucuy, 16 Mar 1986." — Holotypus, PORT n.v.; isotypus, MO (not available in 1993); paratypi, Ortega & R. F. Smith 2561, Marcano Berti 930-034, NY!.

Unarmed, macrophyllidious, cauliflorous trees 5—8(—?) m tall with terete pallid annotinous and older branchlets, glabrous throughout, the papery leaflets olivaceous subconcolorous, the loosely few-fld spikes or racemes of fls arising singly or 2-3 together from knotty brachyblasts far below the foliage. Stipules apparently 0. Lf-formula 1/½; lf-stks including discolored but scarcely wrinkled pulvinus 2.5-4.5 cm, at middle ±1.5 mm diam; a sessile shallow-cupular thick-rimmed nectary 1.2-1.5 mm diam at tip of petiole; pinnae 1 pair, the rachis of each 2-3.5 cm; leaflet of each pinna 1, its pulvinule 3-4 mm, the blade amply ovate- or oblong-elliptic from broadly cuneate or rounded base, shortly bluntly acuminate, ±17-22 x 6.5-10 cm; venation pinnate, the straight centric midrib prominulous on both faces, giving rise on each side to 5-7 major and random intercalary secondary nerves incurved-ascending to anastomosis shortly within the plane margin and to a close reticulum of venules finely raised on each face. Spikes loosely ±10—15-fld, the peduncle and rachis together 3.5-7 cm; bracts ovate 0.3-0.5 mm, subpersistent; calyx shallowly campanulate 1.5-1.9 x 1.6 mm, either sessile or contracted at base into a pedicel to 0.9 mm, the depressed-deltate teeth ±0.1 mm; corolla reddish, narrowly trumpet-shaped 10-11 mm, ±18-nerved, the ascending or connivent, triangular-ovate lobes 2-3 x 1-1.7 mm; androecium 72-80-merous, white, 28-30 mm, the tube 11-12 mm, the stemonozone 1.4-1.6 mm; ovary narrowly oblong, obscurely stipitate, glabrous, surrounded at base by a cupular nectarial disc ±0.6 mm tall. Pods subsessile, in profile linear, straight or gently falcate, ±30 x 2.3-2.5 cm, attenuate at base and abruptly apiculate, strongly compressed and only slightly convex over the 12-15 seeds, the sutures not dilated, the stiffly leathery fibrous valves externally fuscous- or purplish-castaneous, low-papillate and evenulose, the cavity continuous, the endocarp gray-tan within but the shallow seed-cups brown-resinous; seeds well separated along the cavity, not seen ripe.