Zygia paucijugata

  • Title

    Zygia paucijugata

  • Author(s)

    Rupert C. Barneby

  • Scientific Name

    Zygia paucijugata (Lundell) L.Rico

  • Description

    45. Zygia paucijugata  (Lundell) L. Rico, Kew Bull. 46: 504. 1991. Pithecolobium paucijugatum Lundell, Contr. Univ. Michigan Herb. 6: 30. 1941. — "MEXICO: Veracruz, at Fortuño on the Coatzacoalcos River, March, 1937, Llewel[l]yn Williams 8290." — Holotypus, MICH! = MICH Neg. 3809.

    Arborescent shrubs attaining 7 m, glabrous except for micropuberulent inflorescence, with terete branchlets, elliptic, dull olivaceous lfts, and capitula of whitish or greenish yellow fls arising singly or fasciculate from knots on annotinous and older branchlets, exceptionally also from some coeval lf-axils. Stipules triangular or subulate ±1-2.5 mm, caducous. Lf-formula i/l½-2½, lfts 6-10 per lf; lf-stks including discolored pulvinus 4—14 mm, at middle 1-1.6 mm diam; nectary at top of lf-stk sessile 0.8-1.3 mm diam; rachis of longer pinnae 1-5 cm, the one or the further interfoliolar segment ±9-25 mm; lft-pulvinules 1.3 2.5 mm; lfts accrescent distally, the blades elliptic or narrowly elliptic from inequilaterally cuneate base, attenuately acuminate, the distal pair 8-11.5 x 2.2-4 cm, (2.9-)3.2-4.5(-4.8) times as long as wide; midrib subcentric and nearly straight, giving rise to ±5-7 major (but slender) incurved-ascending secondary nerves, the tertiary venulation weak. Peduncles 6-14 mm; capitula 8-17-fld, the receptacular axis 1.5-3 mm; bracts 0.7-1.3 mm, persistent; perianth minutely puberulent overall or only on calyx-teeth and corolla-lobes, the corolla 5-nerved in age; calyx campanulate 1.1-2.7 (-"3.2") x 1-1.2 mm, the subulate teeth 0.3-1 mm; corolla 6-8.5 mm, the lobes 0.8-1.2 mm; androecium 14-20 mm, ±30-46-merous, the tube 8.5-11 mm, stemonozone 0.35-0.5 mm, intrastaminal disc ±0.4 mm. Pods (Brigada Vásquez 513, CAS) sessile, broad-linear, straight, planocompressed ±13 x 2 cm, the pale-olivaceous thin-coriaceous, glabrous valves framed by nearly straight, micropuberulent sutures ±0.5 mm wide in dorsal view, low-papillate over each of 11 seeds, not seen fully ripe.

    On riverbanks below 225 m, local in forest of the Atlantic slope in Veracruz and adj. Oaxaca, Mexico (lat. ±17°-20°N). — Not mapped.