21. Sida tuberculata R.E. Fries (1908: 33) var. pseudo-rhombifolia Monteiro (1949: 522) (Figures 8, 11L–Q, 14T)

Lectotype (designated by Krapovickas 2014: 111):— BRAZIL. Minas Gerais: Belo Horizonte, 29-I-1934. H. Monteiro 711 (RBR!, isotype US!).

Taxonomic notes: — S. tuberculata var. pseudo-rhombifolia belongs to section Sidae (Table 1) and is a species morphologically related to Sida viarum and Sida rhombifolia (Krapovickas 2014, Monteiro-Filho 1949). It differs from these species by the presence of 6–8 mericarps (rarely nine), vs. 5 mericarps in S. viarum and 9–14 mericarps in S. rhombifolia; presence of simple trichomes on the margins of the calyx lobes; flowers solitary or crowded in subsessile axillary glomerules, the pedicels up to 15 mm long on solitary flowers (Figures 11L–Q, 14T) (Krapovickas 2005, Brandão et al. 2017).

Distribution, habitat and conservation status: —The species occurs in Venezuela, Bolivia, Paraguay, Argentina, Uruguay and Brazil (northeast, midwest, southeast and south) (Krapovickas 2014, Bovini 2020). In Rio Grande do Sul the species occurs in Park grassland, Sandy grassland, Shallow soil grassland, Inland sub-montane grassland, Bush grassland, Highland grassland, Aristida grassland, Coastal grassland and Inland subtropical Forest (Figure 8). The species is here considered Least Concern (LC) because it has large EOO and AOO, since it is a frequent and ruderal species, and widely distributed.

Representative specimens: — BRAZIL. Rio Grande do Sul. Alegrete, Estação do Tigre, 23 November 1958, J . Mattos 6223 (HAS); Barra do Quaraí, Parque Estadual do Espinilho, 54 m, WGS 84 S -30.202154° W - 57.505048°, 02 December 2020, M . Grings et al. 2197 (ICN); Caçapava do Sul, defronte a Pedra do Segredo, 25 March, 1995, O . Bueno et al. 4198 (HAS); Caxias do Sul, Água Azul, 10 January 1981, O . Bueno 2882 (HAS); Giruá, Granja Sodal, 04 April 1966, K . Hagelund 4223 (HAS); Porto Xavier, 28 Km SE de Porto Xavier, 18 February 1978, A . Krapovickas & C. L . Cristóbal s.n. (ICN 45915); Cristal, 7 Km da ponte de divisa com Camaquã, BR-116, 07 January 1980, O. Bueno 2064 (HAS); São Pedro do Sul, 03 December 1981, O . Bueno 3425 (HAS) .