Place of Publication
Anales Jard. Bot. Madrid 76(2): 1 (2019)
Chile, región de Antofagasta, El Loa, Toconao, cordón S de los cerros de La Pacana, 23°9′28″ S, 67°27′56″ W, 4880 m a.s.l., 4–III–2019, J. Calvo 7911 leg. (holo-: SGO; iso-: CONC, MA, Z). Figs. 1 and 2.
Calvo & Moreira-Muñoz (2019)
Calvo, J and Moreira-Muñoz, A 2019. Contributions to the Andean Senecioneae (Compositae), part III: A new species of Senecio from northern Chile. Anales Del Jardín Botánico de Madrid, 76(2): 1-4
Distribution and habitat
Region Antofagasta, currently only known from the southern part of La Pacana hills, located in El Loa Province. It grows in extremely arid screes from the desertic ‘puna’ ecoregion, near the vegetation limit at elevations between 4800 and 5000 metres above sea level. The few associated species include: Menonvillea virens, Nototriche sp. Oriastrum polymallum and Senecio. puchei.
Perennial herb, with stems 3–8 cm long. Flowering in March
This species might be confused with S. algens, in fact this new species was collected as S. algens. Senecio toconaoensis differs in having it stems below the ground, which usually bear remnants of old leaves and are white (vs. stems that are rather elongated ad lie on the ground). The achenes are with long silky hairs (vs. hairless). It can also be confused with. S. altoandinus but differs by having fine hairs and prostrate woody stems (Calvo & Moreria, 2019).