Zygia biflora L.Rico

  • Authors

    Rupert C. Barneby

  • Authority

    Barneby, Rupert C. & Grimes, James W. 1997. Silk tree, guanacaste, monkey's earring: A generic system for the synandrous Mimosaceae of the Americas. Part II. , , and . Mem. New York Bot. Gard. 74: 1-149.

  • Family

    Mimosaceae

  • Scientific Name

    Zygia biflora L.Rico

  • Type

    "GUATEMALA. T. Ortiz 2463 . . . Department of Izabal, between Puerto Méndez and Cienaga, 18 March 1972." — Holotypus, BM n.v.; isotypi, F!, LL (not available in 1994); paratypi, Contreras 11472, NY!, TEX!.

  • Description

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    Species Description - Macrophyllous trees attaining 10-12 m with trunk 2 dm diam and pallid terete branchlets of the genus, glabrous except for minutely brown-puberulent young lf-stks and inflorescence, the papery bifoliolate lvs bicolored, dull brown-olivaceous above, paler beneath, the fls arising singly on short bibracteate peduncles from knots on annotinous and older branches below the current season’s foliage. Stipules narrowly triangular ±1-1.5 mm, deciduous. Lf-formula 1/½, each pinna 1-foliolate; lf-stks including livid pulvinus 3-8.5 mm, at middle 0.6-0.8 mm diam; nectary at tip of petiole (few seen) subsessile, cupular ±0.5-1 mm diam; rachis of pinnae 3.5-9 mm; lft-pulvinules 2-2.4(-4) mm, scarcely wrinkled; lfts appearing terminal but in reality posterior and lateral to a small terminal appendage of the rachis, the blade ovate-acuminate from either subsymmetrically or inequilaterally broad-cuneate base, 7-12.5 x 2.5-5 cm, 2.3-2.8 times as long as wide, the margin closely conspicuously undulate; venation shallowly impressed on upper face of blade, sharply prominulous beneath, the subcentric midrib forwardly incurved, the major, incurved-ascending secondary nerves 5 on each side, the connecting and reticular venules weak. Peduncles solitary or paired at a node, 1.5-3 mm; bracts 2 navicular obtuse, scarcely 1 mm, persistent; flowers solitary, sessile, the perianth and androecium white, the corolla minutely puberulent under magnification; calyx narrowly campanulate ±4 x 1 mm, the teeth at most 0.4 mm; corolla tubular 10.5 mm, the ovate lobes 0.8 mm; androecium ±16 mm, 50-60-merous, the tube ±7.5 mm, not quite as long as the corolla; intrastaminal nectary 0.4 mm; ovary subsessile, glabrous. Pods not known.

    Distribution and Ecology - In high forest on hilltop, near 200 m, known only from the type locality and from El Estor in dept. Izabal, Guatemala. — Not mapped. — Fl. III.

    Relationships - The relatively small, marginally crimped leaflets of Z. biflora recall Z. conzattii, but the leaf-formula is that of Z. unifoliolata. The solitary flowers are unique in the genus.

  • Distribution

    Izabal Guatemala Central America|