Eperua grandiflora subsp. ciliata, Fortes & Dos & Steege & Aymard & Secco & Martins-Da-Silva & Mansano, 2023

Fortes, Elenice A., Dos, Ilka P., Steege, Hans Ter, Aymard, Gerardo, Secco, Ricardo De S., Martins-Da-Silva, Regina Célia V. & Mansano, Vidal F., 2023, A taxonomic revision of the genus Eperua (Leguminosae, Detarioideae, Detarieae), Phytotaxa 617 (1), pp. 1-127 : 61

9c. Eperua grandiflora subsp. ciliata E.A. Fortes & Mansano, subsp. nov.

( Figures 9 , 35 , 36 , 37 )

Type:— GUYANA. Potaro-Siparuni, Potaro River below Waratuk Falls , 107 m elev., 5°16’57”N 59°21’39”W, 05 September 2006, Redden K. M. et al. 4029 (holotype US [00963900]!).

Diagnosis: — Eperua grandiflora subsp. ciliata shares with other subspecies of E. grandiflora the free stipules, 2–3- jugate leaves, and persistent bracteoles attached to the higher portion of the pedicels or at the base of the hypanthium. It also shares irregularly villous sheath, and glabrous ovary and fruits with subsp. grandiflora . Eperua grandiflora subsp. ciliata differs from other subspecies by the glabrous inflorescences, pedicel, hypanthium, and sepals (vs. with indumentum in subsp. grandiflora and subsp. guyanensis ), bracts and bracteoles glabrous with ciliate margin (vs. with indumentum in subsp. grandiflora and subsp. guyanensis ), and larger [4.7–5.6 × 3.8–5.9 mm] bracteoles (vs. smaller [1.3–3.9 × 1.5–3.7 mm] in subsp. grandiflora and subsp. guyanensis ).

Leaves, margin flat. Inflorescences glabrous; bracts glabrous, ciliate; bracteoles 4.7–5.6 × 3.8–5.9 mm, glabrous, ciliate; pedicel glabrous; buds, glabrous. Flowers: hypanthium, sepal glabrous; stamens, sheath irregularly villous; ovary glabrous. Legumes glabrous.

Phenology:— Flowering in September.

Distribution:— Potaro River in the Esequibo River basin ( Guyana, Potaro-Siparuni). It is sympatric with E. jenmanii , which also occurs in the same basin.

Habitat:— It occurs in floodplain (riparian) forests, and wallaba forests, on white sand soils from 107 to 498 m elev.

Occurrence in protected areas:— Kaieteur National Park ( Guyana).

Etymology:— The specific epithet relates to its ciliate bracts and bracteoles.

Vernacular names:— unknown

Uses:— unknown.

Taxonomic notes:— Eperua grandiflora subsp. ciliata is known by only three specimens which shows some sympatry with E. grandiflora subsp. guyanensis . In the upcoming phylogeny of the genus E. grandiflora subsp. ciliata was sampled with one accession that appears as a sister group to the other two subspecies of E. grandiflora (Fortes et al. in prep.). This lineage grouping the three subspecies of E. grandiflora received maximum phylogenetic support.

Specimens examined (paratype):— GUYANA. Cuyuni-Mazaruni, Pakaraima Mts., Mazaruni River , trail approx. 0.8 miles North from mining camp, 570 m ele., 6°5’4”N 60°39’2”W, 21 February 2004, Redden K . M . et al. 2059 (NY[03777031] image!, US [01952126]!). Potaro-Siparuni, Tukeit Landing below Kaieteur Falls on Potaro River , 498 m elev., 5°12’16”N 59°27’11”W, 02 September 2006, Redden K . M . et al. 3962 (CAY[109805] image!, US[00963896]!).

Figures

FIGURE 9. Geographic distribution of Eperua grandiflora subsp. grandiflora, E. grandiflora subsp. guyanensis, E. grandiflora subsp. ciliata, and E. manausensis.

FIGURE 35. Eperua grandiflora subsp. ciliata. A. flowering branchlet; B. leaflet, abaxial surface; C, D.inflorescence in buds.Specimens, A–E: Redden K.M. et al. 4029; F: Redden K.M. et al. 3962. Photos E.A. Fortes.

FIGURE 36. Eperua grandiflora subsp. ciliata: A. part of the inflorescence in buds; B. detail of the ciliate bracts and bracteoles; C. inflorescence showing the flowers, bracts, and bracteoles; D. detail of a flower showing the bract (at the base of the pedicel) and bracteoles (at the base of the hypanthium); E. detail of the hypanthium and stamen indumentum; F. flower showing the glabrous hipanthium, villous sheath, and glabrous ovary. Specimen, A–F: Redden K.M. et al. 4029. Photos, E.A. Fortes.

FIGURE 37. Eperua grandiflora subsp. ciliata: A. leaf; B. intramarginal vein, abaxial surface; C. inflorescence with flowers in bud; D. inflorescence with flowers at anthesis; E. detail of a bud showing one ciliate bract at the base and two ciliate bracteoles covering the bud (left); F. flower showing one bract at the base of the pedicel and two bracteoles at the base of the hypanthium; G. stamens joined in a diadelphous sheath; H. detail of the stamen indumentum; I. anther and part of the filament; J. glabrous carpel. Specimen, A, B, D–J: Redden K.M. et al. 4029; C: Redden K.M. et al. 3962. Illustrated by Marcus Falc„o.