Zygia guinetii 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
"PERU. Depto Loreto: Prov. Maynas, Mishana, (Río Nanay), 73°35'W, 03°55'S, 130 m . . . Vásquez, Jaramillo & Criollo 5373." — Holotypus, K (n.v.); isotypus, MO!; paratypi, LI. Williams 727, 754, 755, all F!.
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Description
Species Description - Amply macrophyllous shrubs 2—6 m with terete pallid branches, the young stems and lf-axes setulose with straight spreading, lustrous brown trichomes to 0.7-1 mm, the papery lfts dull olivaceous, paler beneath, usually pilose along major nerves of epiphyllum and thinly pilose along most nerves of hypophyllum (this rarely glabrous), ciliolate, the few-fld capitula of "reddish" fls borne in condensed, quasi-fasciculate pseudoracemes on knots of annotinous and older branches, most peduncles subtended by a rudimentary lf-stk with nectary. Stipules (1 seen) triangular acute ±4x2 mm. Lf-formula i/2½; lf-stks 6-8 x 2.5-4 mm; nectaries at top of petiole and between each pair of lfts sessile, shallowly cupular 1.5-4 mm diam; rachis of longer pinnae 11-15 cm, the further interfoliolar segment 4.5-7.5 cm; lft-pulvinules coarse discolored 5-8.5 mm; lft-blades broadly elliptic from antically semiacute, postically semicordate base, attenuately acuminate, the distal pair 20-27 x 7-9 cm, 2.9-3.3 times as long as wide; venation pinnate, the gently incurved midrib together with incurved-ascending secondary and transverse tertiary venules all depressed on ventral face and sharply prominulous dorsally (the blade surface consequently incipiently bullate), the strong incurved-ascending secondary nerves 6-8 on each side of costa. Peduncles 2-4 mm; capitula ±6-9-fld, the receptacle ±1.5 mm diam; bracts triangular <1 mm, persistent; perianth appearing glabrous but the orifice of calyx and lobes of corolla minutely puberulent; calyx symmetrically or asymmetrically campanulate 0.6—1.5 x 0.8—1 mm, the teeth (equal or one longer) at most 0.3 mm, separated by wide sinuses; corolla slenderly trumpet-shaped (not "turbinate") 8.2-9.5 mm, the lance-ovate lobes 1.7—1.8 mm; androecium 32-42-merous, 20-30 mm, the tube 11-12 mm, the stemonozone ±1 mm, the intrastaminal nectary 0.60.7 mm; ovary subsessile, at anthesis glabrous. Pods unknown.
Distribution and Ecology - In seasonally flooded riparian forest (tahuampa) ±130 m, known only from lower ríos Itaya and Nanay, tributaries of the Amazon SW of Iquitos in prov. Maynas of dept. Loreto, Peru. — Not mapped. — Fl. VI—VII.
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Discussion
Among macrophyll zygias of upper Amazonia with capitulate units of inflorescence and at most 5 leaflets per pinna, Z. guinetii is notable for relatively thin- textured, incipiently bullate leaflet-blades with midrib and principal secondary nerves depressed ventrally and sharply raised dorsally. The ferruginous hairs stressed in the protologue are sometimes short, sparse, and confined to the stronger nerves of the hypophyllum. Rico’s illustration of the corolla (fig. 2C) correctly shows it slenderly trumpet-shaped, not "turbinate" as it is characterized in the Latin diagnosis and commentary. Assessment of relationships must be postponed until the fruit is known.
A single leaf (Urrego 1167, MO) collected on the Caquetá River close to the mouth of the Quinche River in Amazonas, Colombia, is reminiscent of Z. guinetii in texture, coloration, and venation of the leaflets but different in densely minutely punctate hypophyllum. It may represent an undescribed taxon.
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Common Names
Millua-shicshi
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Distribution
Loreto Peru South America|