Rhynchosia naineckensis Fortunato, Darwiniana, 1982

Bezerra, Luísa Maria De Paula Alves, Cândido, Elisa Silva, Vargas, Wanderleia De, Torke, Benjamin Marland, Lewis, Gwilym Peter & Perez, Ana Paula Fortuna, 2024, Taxonomic revision of Rhynchosia Lour. (Leguminosae, Papilionoideae, Phaseoleae) in South America, Phytotaxa 643 (1), pp. 1-67 : 49-50

publication ID

https://doi.org/ 10.11646/phytotaxa.643.1.1

DOI

https://doi.org/10.5281/zenodo.13213452

persistent identifier

https://treatment.plazi.org/id/79295A76-9908-5841-81A6-FB3DFF47FEAB

treatment provided by

Felipe

scientific name

Rhynchosia naineckensis Fortunato, Darwiniana
status

 

21. Rhynchosia naineckensis Fortunato, Darwiniana View in CoL 24: 497–498. 1982. Type:— ARGENTINA, Formosa: Dep. Pilcomayo, Laguna Naineck , ruta 86, km 1334 ½, August 1981 (fr.), R. Fortunato et al. 57 (Holotype: BAB 00000498 [digital image!]; isotype: SI 002522 [digital image!]). Iconography: Rodriguésia 70: 13. 2019

Vine suffrutescent, twining, stems branched, pilose, indumentum white to light yellow, with yellow vesicular glands, but lacking bulbous-based trichomes. Stipules 2–3.1 × 0.5–1 mm, free, persistent, lanceolate, externally pilose with yellow vesicular glands, but lacking bulbous-based trichomes. Leaves trifoliolate; petiole 1–5.4 cm long; leaf rachis 1–2.1 cm long; stipels absent; leaflets 2,4–5.3 × 2–4.9 cm, ovate or deltoid to rhombic, surface not bullate, attenuate to acuminate at apex, obtuse or truncate at base, margin entire, pilose, with yellow vesicular glands on the abaxial surface. Inflorescence axillary, racemose, 2.7–3.5 cm long, bearing 6–9 flowers, not exceeding the length of the subtending leaf; bracts caducous; pedicels 1–1.5 mm long. Flowers 4–7 mm long excluding the pedicel; calyx 2–3.2 mm long, pubescent with yellow vesicular glands, but lacking bulbous-based trichomes, lobes lanceolate, not exceeding the corolla in length; standard petal 4–6 × 3–4.7 mm, orbicular, emarginate at apex, pilose to pubescent, with yellow vesicular glands, but lacking bulbous based trichomes, claw 1–1.5 mm long, auricle ca. 0.5 mm long; wing petals 4–5 × 1–2 mm, oblong, claw. 1.3–2 mm long, auricle ca. 0.5 mm long; keel petals 5–6 × 2–2.2 mm, falcate, claw ca. 1–2 mm long; stamens 5–5.5 mm long; ovary 2–3.3 mm long, pubescent, with yellow vesicular glands. Fruits 1.1–1.6 × 0.6–0.8 cm, reddish-brown to black, strongly constricted between the seeds, oblong, glabrescent, with yellow vesicular glands, but lacking bulbous-based trichomes. Seeds 4.7–5.5 × 3–4 mm, suborbicular, bicolored, black and red, the red confined to the hilar area.

Nomenclatural and taxonomic notes: — Rhynchosia naineckensis was described by Fortunato (1982). The type material comes from the municipality of Laguna Naineck, province of Formosa, thus the species epithet. Morphologically, it resembles R. erythrinoides and R. melanocarpa , but it is easily recognizable by the characters listed in Table 1 View TABLE 1 .

Reproductive phenology: —Flowering from February to April, and in June and September; fruiting in January to February, and from April to June and August to September.

Distribution and habitat: — Rhynchosia naineckensis occurs in Argentina, Bolivia, Brazil and Paraguay ( Fig. 13 View FIGURE 13 ). It occurs in tropical and semideciduous forests and sandy and clay soil fields.

Conservation status: —Least Concern (LC). Based on an EOO of 1,393,554 km 2 (GeoCAT, accessed in May 2022), R. naineckensis is classified as LC, following the IUCN Red List criteria ( IUCN 2022). Nevertheless, the most recent record of the species was collected in 1995 and attempts to collect more specimens and to conserve the species should be made.

Selected Specimens Examined:— ARGENTINA. Corrientes: Dep. General Paz, Itá Ibate, barrancas del Paraná , 26 July 1979 (fr.), D. Medán et al. 26 ( BAA); San Cosme, May 1975 (fr.), A. Schinini & C. Quarin 115 ( CTES) . Formosa: Formosa, Río Salado , August 1967 (fr.), A. Krapovickas 13013 ( CTES) ; BOLIVIA. Santa Cruz: Ichilo, Estância San Rafael de Amboró, ca. 30km SE of Buena Vista along the Rio Surutú , 25 August 1985 (fl./fr.), J. C. Solomon 14031 ( NY) . BRAZIL. Rio de Janeiro: Cabo Frio, Restinga de Cabo Frio , 18 November 1967 (fl./fr.), D. Sune 1927 ( RB) . São Paulo: Dracena, Estância Boa Esperança , floresta mesófila, 6 September 1995 (fr.), L. Bernacci et al. 2070 ( SP) ; Núbia, Fazenda Caramuru ( Suiços ), Vegetação em recomposição, 4 September 1995 (fr.), L. Bernacci et al. s/n. ( SP) ; Paulo de Faria , Estação Ecológica de Paulo de Faria, 19º55’S, 49º31’W, 23 August 1995 (fr.), M. D. N. Grecco et al. 83 ( SP) GoogleMaps . PARAGUAY. L’assomption, 1845 (fr.), B. Balansa 1845 (P). San Pedro: Alto Paraguay, 28 April 1955 (fr.), A. L. Woolston 513 ( NY) . Tarija: Gran Chaco 15 kms hacia el norte de Yacuiba, 23 September 1985 (fl./fr.), Beck, Michel & Garcia 11470 ( NY) . Tavarory: Acosta ñu, 04 March 1992 (fl.), E. Zardini & T. Tilleria 30980 ( NY) .

BAA

Universidad de Buenos Aires

CTES

Instituto de Botánica del Nordeste

NY

William and Lynda Steere Herbarium of the New York Botanical Garden

RB

Jardim Botânico do Rio de Janeiro

SP

Instituto de Botânica

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Fabales

Family

Fabaceae

Genus

Rhynchosia

Loc

Rhynchosia naineckensis Fortunato, Darwiniana

Bezerra, Luísa Maria De Paula Alves, Cândido, Elisa Silva, Vargas, Wanderleia De, Torke, Benjamin Marland, Lewis, Gwilym Peter & Perez, Ana Paula Fortuna 2024
2024
Loc

Rhynchosia naineckensis

Fortunato 1982: 497
1982
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