Nasa humboldtiana (Urb. & Gilg) Weigend subsp. obliqua
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Ordo: Cornales
Familia: Loasaceae
Genus: Nasa
Name
Nasa humboldtiana Weigend, Revista Peru. Biol. 13(1): 75 (2006). – Wikispecies link – Pensoft Profile
Type
Peru. Cajamarca: Provincia Hualgayoc [Prov. Santa Cruz], Monte Seco, 1800 m, J. Soukup 3826 (holotype: US! [00604255, acc. # 1985252]) .
Collected in the Reserva El Corazón, but in a semi open forest/grassland ecosystem with scattered native tree remnants adjacent to the forest where Nasa humboldtiana subsp. humboldtiana occurs, and on the same day, XC also collected and photographed another subspecies of Nasa humboldtiana, which is here tentatively assigned to N. humboldtiana cf. subsp. obliqua (Fig. 2C). This taxon had previously only been reported from a single area in northern Peru, namely the Prov. Santa Cruz in the department of Cajamarca (Fig. 2D). The new record in Ecuador lies ca. 550 km north of the original collection on the western slope of the Peruvian Andes, and additional studies are required to confirm its identity. It may also represent a separate and novel taxon or unusually small-flowered plants of the widespread SW Ecuadorean endemic Nasa humboldtiana subsp. roseoalba, whose type locality is near Chillanes (Bolívar, Ecuador) ca. 20 km to the northwest. This taxon was even collected previously in El Corazón in sterile condition in Feb. 2017 (R. Acuña & D. Guilcapi 1725, QCA, BONN). The leaflet texture and leaflet base shape of the newly collected plants appear to be somewhat intermediate between more typical N. humboldtiana subsp. roseoalba and N. humboldtiana subsp. obliqua.
Additional specimens examined
Peru. Cajamarca: Provincia Santa Cruz, Monte Seco, 1500 m, N. Dostert 98/154 (CPUN, F, M, USM); La Florida, above Monteseco, 1200–1500 m, 5 May 2003, M. Weigend et al. 7554 (B, HUT, USM, M); Near Agua Azul, 5 May 2003, Weigend et al. 7569 (B, HUT, M, USM); Ecuador. Chimborazo: Reserva El Corazón, a montane Andean forest, ca. 2700 m, 2°03'S, 78°54'W, 10 Jul 2021, X. Cornejo & J. Josse 9389 (GUAY).
Taxon Treatment
- Henning, T; Acuña-Castillo, R; Cornejo, X; Gonzáles, P; Segovia, E; Wong Sato, A; Weigend, M; 2023: When the absence of evidence is not the evidence of absence: Nasa (Loasaceae) rediscoveries from Peru and Ecuador, and the contribution of community science networks PhytoKeys, 229: 1-19. doi
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