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| Nasa angeldiazioides
T.Henning, R.H.Acuña, E.Rodr., L.García-Llatas & Weigend
in Henning, Castillo, Rodríguez, et al., 2019.
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Abstract
Nasa angeldiazioides sp. nov. is described and illustrated. The species is restricted to two forest remnants on the western slope of the northern Peruvian Andes (Dept. Lambayeque) where it is found in the undergrowth of primary forest. The new taxon shows a unique leaf morphology in the family Loasaceae. Molecular and morphological data show that the new species belongs to the Nasa triphylla group. Since the relic forests of the north-western Andes are increasingly threatened by the effects of climate change, i.e. droughts and wildfires, the new species already faces imminent extinction.
Keywords: Loasaceae, Peru, Laquipampa, Nasa, Lambayeque, Amotape-Huancabamba-Zone, narrow-endemic, Chiñama, Angeldiazia, new species
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| Figure 2. Morphology of Nasa angeldiazioides (A–E, L, M) and similar taxa (F–K). A Flower, frontal view B Flower, lateral view C Capsule, lateral view, note the thin, curved pedicel D General habit of several flowering plants in their natural habitat, Bosque de Chiñama E Mature basal leaf F Mature leaf of Nasa urens G Young plant of N. pteridophylla H Flower of Nasa formosissima, lateral view I Amplexicaul bract of N. formosissima J, K Leaves of Angeldiazia weigendii, abaxial surface, note the overall shape and the ampexicaul leafbase visible in the background L Bract, prophyll and capsules of Nasa angeldiazioides M Lowermost bract of N. angeldiazioides, outlined from a specimen photograph.
(photographs: A, B, D B. Esquerre-Ibañez J, K Mario Zapata).
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| Figure 3. Nasa angeldiazioides. A Flowering shoot B Mature leaf C Flower D Petal E Calyx lobe F Nectar scale, abaxial view G Staminode, lateral view H Capsule, lateral view.
Drawing prepared by L. García (D–H), T. Henning (A, B) and R. Acuña (C).
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Nasa angeldiazioides T.Henning, R.H.Acuña, E.Rodr., L.García-Llatas & Weigend, sp. nov.
Diagnosis: Nasa angeldiazioides is similar to N. bicornuta, N. pteridophylla and N. urens but differs in having strongly amplexicaul leaves, sessile to amplexicaul prophylls on the pedicels and flowers with white petals and dark red nectar scales. The unique interrupted bipinnatisect leaves with rounded leaflet apices distinguish N. angeldiazioides from all other taxa of Nasa and Loasaceae as a whole.
Etymology: The epithet refers to a recently described monotypic genus of Asteraceae from the same area, Angeldiazia weigendii M.O.Dillon & Zapata (Dillon and Zapata 2010). The latter species has an extremely peculiar leaf morphology: deeply pinnatisect, amplexicaulous leaves with rounded leaflet apices, i.e. leaves that in the living state look extremely similar to the upper leaves and bracts of the new species here described (Figs 2J–M, 3A).
Tilo Henning, Rafael Acuña Castillo, Eric Frank Rodríguez Rodríguez, Luis Felipe García Llatas and Maximilian Weigend. 2019. A New Striking and Critically Endangered Species of Nasa (Loasaceae, Cornales) from North Peru. PhytoKeys. 121: 13-28. DOI: 10.3897/phytokeys.121.33927
Resumen: Se describe e ilustra la especie inédita Nasa angeldiazioides sp. nov. Esta especie está restringida a dos remanentes de bosque de la vertiente occidental de los Andes del norte del Perú (Depto. Lambayeque), donde se la encuentra en el sotobosque de bosques primarios. Nasa angeldiazioides muestra una morfología foliar única en la familia Loasaceae. Tanto la evidencia morfológica como la molecular muestran que esta nueva especie pertenece al grupo de Nasa triphylla. Dado que los bosques relictos de los Andes noroccidentales del Perú se encuentran cada vez más amenazados por los efectos del cambio climático, como lo son las sequías e incendios forestales más frecuentes, esta nueva especie podría estar enfrentando una extinción inminente.
