Costus juruanus K.Schum. var. juruanus

  • Authority

    Maas, Paulus J. M. 1972. Costoideae (Zingiberaceae). Fl. Neotrop. Monogr. 8: 1-140. (Published by NYBG Press)

  • Family

    Costaceae

  • Scientific Name

    Costus juruanus K.Schum. var. juruanus

  • Type

    Type. Killip & Smith 25317 (neotype, US; isoneotype, NY,) Perene Bridge, Rio Paucartambo Valley, Junin, Peru. The holotype Ule 5740 p.p. from middle Rio Jurua, Amazonas, Brazil having been destroyed at Berlin in 1943, a neotype is chosen here.

  • Synonyms

    Costus juruanus K.Schum.

  • Description

    Description - Sheaths and ligule sparsely to densely puberulous. Leaves glabrous on both sides or sparsely puberulous towards the margin; costa beneath rather densely villose to hirsute at the base, sparsely puberulo-sericeous towards the apex.

  • Discussion

    Cuatrecasas 12865 (US) from Sarare River Region between El Amparo and La Mesa, Cordillera Oriental, Norte de Santander, Colombia, collected between 1400 and 1700 m would run to this species in the key because of its extremely long ligule (to 50 mm long!). The inflorescence, however, agrees entirely with that of C. lima. The specimen might represent a new variety of C. lima, but it is also possible that it belongs to C. lima var scabremarginatus with some introgression of C. juruanus. This problem can only be solved after studying fresh material, including flowers.

  • Distribution

    (Fig 38, 3). Eastern Peru and western Brazil; in dense forests, from sea-level to 700 m.

    Brazil South America| Acre Brazil South America| Peru South America| Junín Peru South America| San Martín Peru South America|