Echinopsis Zuccarini (1837: 675)

Oliveira, Anabela Silveira De, Pontes, Rodrigo Corrêa, Robaina, Luis Eduardo De Souza & Trentin, Romário, 2022, The Cactaceae family in the Santa Maria river basin (Rio Grande do Sul, Brazil), Phytotaxa 542 (2), pp. 153-166 : 159

2. Echinopsis Zuccarini (1837: 675)

Type (designated by Zuccarini 1843: 4):— Echinopsis eyriesii (Turpin) Zucc. ≡ Echinocactus eyriesii Turpin (1830: 157 plate 2).

Species richness:— 50 species, of these three occur in Brazil and two in Rio Grande do Sul ( Carneiro et al. 2016), E. oxygona and E. eyriesii (Oliveira Deble 2011) .

General distribution:— Echinopsis is distributed in southern Brazil, Uruguay, Bolivia, Paraguay, and Argentina ( Hunt et al. 2006).

Distribution in Santa Maria river basin:— Echinopsis oxygona ( Fig. 2B ), presenting a wide distribution of the study area ( Fig. 3 ) and in Rio Grande do Sul, which may occur mainly in rocky outcrops, native fields associated with saxic vegetation,

Morphologic notes:— This species has 8–10 ribs, with flowers. The infusiveness of rose or white-rose petals up to 20 cm long blooms from October to February, bearing fruit shortly thereafter.

Figures

FIGURE 2. A) Cereus hildmaninanus (whitish-pink flowers). B) Echinopsis oxygona (pink flowers). C) Frailea albifusca. D) Frailea castanea. E) Frailea albifusca.F) Frailea lepida.G) Frailea mammifera. H) Frailea pumila. I) Frailea pygmaea.J) Frailea erythracantha K) Gymnocalycium denudatum (white flowers). L) Gymnocalycium uruguayense (yellow flowers). Pictures by A. S. Oliveira.

FIGURE 3. A) Opuntia megapotamica (orange flowers). B) Parodia arnostiana (yellow flowers). C) P. herteri (pink flowers). D) P. linkii (yellow flower). E) P. mammulosa (yellow flower). F) P. nothorauschii. G) P. ottonis(flores yellow flower). H) P. ritteriana(yellow flower). I) P. tenuycilindrica. J) Wigginsiasellowii (yellow flower). K) W. langsdorffii (pale-yellow flower). L) W. turbinata (yellow flower). Pictures by A. S. Oliveira.