1. Family: Fabaceae Lindl.
    1. Genus: Mucuna Adans.
      1. Mucuna argentea T.M.Moura, G.P.Lewis & A.M.G.Azevedo

        This species is accepted, and its native range is Colombia to N. Peru.

    [CPLC]

    Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

    Distribution
    Nativa en Colombia; Alt. 160 - 1300 m.; Amazonia, Andes, Guayana y Serranía de La Macarena.
    Habit
    Trepadora
    Conservation
    En Peligro
    [KBu]

    Moura, T.M., Lewis, G.P., Mansano, V.F. et al. 2013. Three new species of Mucuna (Leguminosae: Papilionoideae: Phaseoleae) from South America. Kew Bulletin 68: 143. DOI https://doi.org/10.1007/s12225-012-9429-6

    Type
    Type: Colombia, Caquetá Peña Roja, Kats & Dulmen AVD265 (holotype K!; isotypes COAH!, MO!).
    Habit
    Lianas; stems sericeous
    Leaves
    Leaves alternate, 3-foliolate; stipules c. 5 × 1 mm, triangular, sericeous; pulvinus cylindrical, 10 × 3 mm, with a dense indumentum of erect or appressed hairs; petiole 10 – 12 cm long, angular, sericeous; rachis 1 – 3 cm long, angular, sericeous; stipels linear, 3 mm long, sericeous; petiolules 5 – 10 mm long, sericeous, the hairs more dense than on the petiole and rachis; leaflet blades ovate to elliptic, occasionally obovate, apical leaflet 12 – 17 × 9 – 12 cm, lateral leaflets 12 – 15 × 7 – 10 cm, asymmetrical, all blades obtuse or rounded at base, acuminate or cuspidate at apex, sparsely sericeous adaxially, densely silvery sericeous abaxially, venation eucamptodromous, secondary veins in 7 – 8 pairs per leaflet
    Inflorescences
    Inflorescence axillary, pseudo-umbelliform, pendent; peduncle 7 – 10 cm long, sericeous; primary axis condensed, all flowers inserted close together at the apex; primary bracts (at base of whole inflorescence axis) caducous (3 cm long, which fall before anthesis); secondary bracts (at base of each node or individual flower) absent; pedicels 1.5 – 2 cm long sericeous; flowers 8 – 9 cm long
    Calyx
    Calyx campanulate, 2 – 2.5 cm long, with long appressed hairs on both surfaces; lobes 4, the adaxial lobe formed by two connate sepals, 5 × 3 mm, apex obtuse, the other three lobes 5 – 7 × 3 mm long, apex acute
    Corolla
    Corolla reported to be yellow [Dulmen 265 (K); Klug 2265 (K); Cardenas et al-6116 (K)]; standard 5 – 6 × 3 cm, broadly elliptic, base attenuate, apex retuse, the claw c. 1 – 2 mm long, glabrous; wing petals 7 – 9 × 1 – 1.5 cm, oblong-obovate, base attenuate, apex obtuse, pubescent at base, the claw c. 7 – 10 mm; keel petals 7 – 8.5 × 0.7 – 0.8 cm, oblong, base attenuate, apex acute, pubescent at base, the claw c. 1 mm long
    Stamens
    Stamens 10, diadelphous, with nine fused for about 75% of their filament length, one free; filaments 8 cm long, glabrous; anthers oblong, basifixed, 4 mm long, the connective tomentose
    Gynoecium
    Gynoecium 9 – 10 cm long; ovary sessile, oblong, 10 × 2 mm, densely sericeous, 3 – 4-ovulate; style 8 – 9 cm long, densely sericeous, glabrescent at apex, stigma villous
    Fruits
    Young fruits 17 × 3 cm, base attenuate, apex apiculate, valve surfaces with an indumentum of long urticating hairs and shorter, dense, dark-coloured hairs, but lacking lamellate ornamentation and without winged margins
    Seeds
    Immature seeds 2 – 4 per pod, with the hilum extending around most of the seed circumference; mature seeds not seen
    Figures
    Fig. 1.
    Distribution
    Mucunaargentea occurs in Ecuador, Peru and the Amazonian region of Colombia (Map 1).
    Ecology
    Field labels report the species from ‘selva’ and secondary forest, frequently close to rivers. In general it occurs at low elevations, alt. 160 – 450 m; it also has been reported at 1300 m in Meta, Colombia.
    Conservation
    Mucunaargentea occurs predominantly in Amazonian forest, especially close to rivers, where it prefers undisturbed habitats. Based on herbarium specimens it appears that M. argentea is relatively common in Colombia but rare in Ecuador and Peru and, according to IUCN criteria (2001), this species can be temporarily assessed as Endangered (EN).
    Phenology
    Flowering June – Jan., with most flowering specimens in herbaria reported to have been collected in Aug.; fruiting Aug. – Nov.
    Note
    The specific epithet refers to the silvery indumentum on the abaxial surface of the leaflets. Among the South American species with a pseudo-umbelliform inflorescence, Mucunaargentea is the only one that has a silvery indumentum on the abaxial surface of the leaflets. The presence of large sericeous bracts, which fall before the flowers open, is also distinctive. Specimens in herbaria are often encountered under the name M. elliptica, but in that species the hairs on the abaxial surface of the leaflets are golden-coloured and erect and the bracts are generally persistent. Only two American species have silver-coloured hairs on the abaxial surface of their leaflets as a strong taxonomic characteristic: M. argentea and M. argyrophyllaStandl. (Standley1922: 504); the latter does not have pseudo-umbelliform inflorescences (they are pseudo-racemose) and it occurs only in Central America. Mucunaargentea has a pseudo-umbelliform inflorescence; a peduncle 7 – 10 cm long; flowers 8 – 9 cm long; a yellow corolla; fruits with a dense indumentum, but no lamellate ornamentation; rounded seeds, with the hilum extending around nearly the whole circumference of the seed. This species is distinct because of the combination of primary bracts 3 cm long, which fall before anthesis, and the dense, appressed silvery hairs on the abaxial surface of the leaflets. M. argentea is morphologically most similar to M. elliptica, but the latter has erect, golden hairs on the abaxial surface of the leaflets and persistent bracts.

    Images

    Distribution

    Native to:

    Colombia, Ecuador, Peru

    Mucuna argentea T.M.Moura, G.P.Lewis & A.M.G.Azevedo appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 2012 Kats, B. [265], Colombia K000882345 holotype
    Jan 1, 2012 Cardenas, D. [6116], Colombia K000882346

    First published in Kew Bull. 68: 143 (2012)

    Accepted by

    • De Moura, T.M., Lewis, G.P., Mansano, V.F. & Tozzi, A.M.G.A. (2018). A revision of the neotropical Mucuna species (Leguminosae-Papilionoideae) Phytotaxa 337: 1-65.
    • Moura, T.M., Lewis, G.P., Mansano, V.F. & Tozzi, A.M.G.A. (2014). Taxonomic studies in Mucuna Adans. (Leguminosae - Papilionoideae) from Peru Systematic Botany 39: 884-896.

    Literature

    Kew Backbone Distributions
    • Moura, T.M., Lewis, G.P., Mansano, V.F. & Tozzi, A.M.G.A. (2014). Taxonomic studies in Mucuna Adans. (Leguminosae - Papilionoideae) from Peru Systematic Botany 39: 884-896.

    Sources

    Catálogo de Plantas y Líquenes de Colombia
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Bulletin
    Kew Bulletin
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0