Zygia eperuetorum (Sandwith) Barneby & J.W.Grimes

  • 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 eperuetorum (Sandwith) Barneby & J.W.Grimes

  • Type

    "BRITISH GUIANA. Bartica-Potaro road . . . fl. Nov. 10th. 1943, D. B. Fanshawe [1434] in Forest Dept. no. 4170." — Holotypus, K!; isotypus, NY!. — Paratypus, Fanshawe in F. D. 3563, K = NY Neg 2036.- Marmaroxylon eperuetorum (Sandwith) L. Rico, Kew Bull.

  • Synonyms

    Pithecellobium eperuetorum Sandwith, Marmaroxylon eperuetorum (Sandwith) L.Rico

  • Description

    Species Description - Slender macrophyllidious cauliflorous trees 3-12 m with trunk 3-8 cm dbh, appearing glabrous but the lf- stks minutely puberulent, the ample, stiffly papery lfts bicolored, when dry olivaceous above, pale brown beneath, the condensed panicle of racemes densely gray-puberulent overall. Stipules unknown. Lf-formula ii/3- 5; lf-stks 5-8.5 cm, the petiole reduced to the pulvinus, the 1 interpinnal segment 5-8 cm; nectary between each pair of pinnae sessile, plane, ±1.5-2 mm diam, none seen on pinna-rachises; rachises of further pinna-pair 20-27 cm, the longer interpinnal segments ±4-7 cm; lft-pulvinules 3.5-5 mm, livid and wrinkled; lfts little graduated, the blades elliptic-acuminate from inequilaterally cuneate base, subfalcately incurved, the longer ones ±10-14 x 3-5.5 cm; venation palmate and then pinnate, the subcentric, gently incurved midrib slenderly prominulous on each face, the posterior primary nerve ascending to or beyond midblade, the anterior one weaker or obsolete, the first pair of secondary nerves narrowly ascending, the further 5-8 pairs widely incurved-ascending, a weak tertiary venulation raised on both faces. Inflorescence a condensed panicle, the primary axis ±3—8 mm, the axis of the subsessile ±6—20-fid racemes ±8—16 mm, some or all racemes subtended by a rudimentary lf-stk with nectary; floral bracts deltate ±0.6 mm, persistent; pedicels 1.5-1.8 x 0.35-0.4 mm; perianth 5-merous; calyx deeply campanulate 2-2.7 x 1-1.4 mm, the depressed-deltate teeth 0.2—0.3 mm; corolla cylindric, moderately ampliate at the limb, 9.5—10 mm, glaucous-green when fresh, the lobes ±1.5 mm; androecium ±21 mm, the tube ±12-13 mm; no nectarial disc; ovary sessile, at anthesis glabrous; fruit unknown.

    Distribution and Ecology - Locally common in wallaba (Eperua) forest on white sand, below 200 m, known only from the lower Essequibo valley in Guyana. — Not mapped. — Fl. XI-XII.

  • Distribution

    Essequibo Guyana South America|