Zygia trunciflora (Ducke) L.Rico
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Authors
Rupert C. Barneby
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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
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Scientific Name
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Type
"... in regione fluminis Tapajoz medii... prope cataractas Mangabal [5°6'S]. l[egit] A. Ducke 18-81923 (H[erb.] J[ard.] Bot.] R[io de Janeiro] n. 16786)." — Holotypus, presumably at RB, though Rico (l.c..) indicated IAN-MG; isotypus, †B = F Neg. 1220 [sph
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Synonyms
Pithecolobium tenuiflorum Benth.
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Description
Species Description - Macrophyllous cauliflorous trees 3-12 dm with trunk 6-10 cm dbh, glabrous except for silky-puberulent fls and frs, the chartaceous lf-blades brown-olivaceous subconcolorous, the units of inflorescence shortly spiciform, solitary and fasciculate on knots along trunk and defoliate branches. Stipules (caducous, few seen) lanceolate ±1.5-3 mm, firm, not striate. Lf-formula i/2½(—3½); petioles 5-12(-24) x 2-4.5 mm; nectary at tip of petiole (little known) sessile, shallowly concave, to 2-3.5 mm diam; rachis of longer pinnae 11-20 cm, the longer interfoliolar segments 4-9 cm; lft-pulvinules 3-9(-10) mm; lfts sub-accrescent distally, the blades broad-elliptic or obovate-elliptic from inequilaterally cuneate base, shortly acuminate, the distal pair 14-26 x 4.5-9.5 cm, 2.5-3.1 times as long as wide; venation pinnate, the subcentric and nearly straight midrib giving rise on each side to 5-7 major (but slender) incurved-ascending secondary nerves, these together with tertiary and reticular venules subimmersed on upper face, finely prominulous beneath. Inflorescence units 15—28-fld, the axis including short peduncle 1-3 cm; bracts ovate-triangular <1 mm, becoming dry deciduous; fls either sessile or contracted at base into a pedicel to 0.5 mm, 5-merous, the perianth finely silky-puberulent overall; calyx deeply campanulate 3-3.6 x 1.2-1.5 mm, the depressed-deltate teeth 0.15-0.3 mm; corolla tubular, a little dilated distally, 8-11.5 mm, the lobes 1.2-1.7 mm; androecium 30-48-merous, 18-26 mm, the tube 8-12.5 mm, the stemonozone 0.6-1.3 mm, the tassel pink, the nectarial disc ±0.4 mm; ovary at anthesis glabrous, strigulose after fertilization. Pods pendulous, subsessile, in profile linear, gently decurved, 13-25 x 1.3-1.4 cm, 13-22-seeded, the rigidly lignescent valves planocompressed, slightly elevated over each seed, framed by sutures ±2.5-4 mm wide in dorsal view, densely minutely gold-brown-silky overall; dehiscence and seeds unknown.
Distribution and Ecology - In forest on terra firme, below 200 m, not recorded as riparian, apparently local in middle Amazonian Brazil, described from the Tapajóz valley in W-centr. Pará, best known from Manáus and vicinity in E Amazonas. — Not mapped. — Fl. V, VIII-XI.
Relationships - This resembles Z. juruana in foliage, but the in- florescence-units are spiciform and the pod is very long and narrow (1.3-1.4, not 3.5-4 cm wide) and densely brown-gold-strigulose overall (not glabrous). It differs from compatriot Z. ampla by inflorescence structure.
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Distribution
Amazonas Brazil South America|