The Cactaceae family in the Santa Maria river basin (Rio Grande do Sul, Brazil) Author Oliveira, Anabela Silveira De 0000-0002-0428-9986 Centro Universitário da Região da Campanha - URCAMP. Programa de Pós-graduação em Geografia / UFSM - Instituto de Geociências / IG / UFSM - Santa Maria, RS. & anabela. biol @ gmail. com; https: // orcid. org / 0000 - 0002 - 0428 - 9986 anabela.biol@gmail.com Author Pontes, Rodrigo Corrêa 0000-0002-2808-3835 Programa de Pós-graduação em Geografia / UFSM - Instituto de Geociências / IG / UFSM - Santa Maria, RS. & rodrigocorreapontes @ gmail. com; https: // orcid. org / 0000 - 0002 - 2808 - 3835 rodrigocorreapontes@gmail.com Author Robaina, Luis Eduardo De Souza 0000-0002-2390-6417 LAGEOLAM / UFSM - Universidade Federal de Santa Maria - Programa de Pós-graduação em Geografia / UFSM - Instituto de Geociências / IG / UFSM - Santa Maria, RS. & lesrobaina @ yahoo. com. br; https: // orcid. org / 0000 - 0002 - 2390 - 6417 lesrobaina@yahoo.com.br Author Trentin, Romário 0000-0002-0615-2801 LAGEOLAM / UFSM - Universidade Federal de Santa Maria - Programa de Pós-graduação em Geografia / UFSM - Instituto de Geociências / IG / UFSM - Santa Maria, RS. & romario. trentin @ gmail. com; https: // orcid. org / 0000 - 0002 - 0615 - 2801 romario.trentin@gmail.com text Phytotaxa 2022 2022-04-05 542 2 153 166 http://dx.doi.org/10.11646/phytotaxa.542.2.3 journal article 53643 10.11646/phytotaxa.542.2.3 282b16de-15c7-4edc-9b01-9f5897706be9 1179-3163 6413545 5. Lepismium Pfeiffer (1835: 315) Lectotype (designated by Pfeiffer 1835: 314–315 ):— Lepismium commune Pfeiffer (1835: 315) L. cruciforme (Velloso 1825: 207) Miquel (1838: 49) . Species richness:— Lepismium is a genus with wide geographic distribution and comprises 6 species ( Hunt et al. 2006 ). In Brazil , there are 4 species of which ocurr in Rio Grande do Sul ( Carneiro et al. 2016 ). General distribution:— Occurs in Brazil , Bolivia , Paraguay , Uruguay , and Argentina . Distribution in Santa Maria river basin:— In SMRB occurs only L. lumbricoides (Lemaire (1939: 60) Barthlott (1987: 99), sometimes found in rocky outcrops and also in trees. Morphologic notes:— This genus is characterized by shrubby plants with stem-segments often angled or flat with the areoles subtended by crenate or serrate, with numerous aerial roots.Areoles sometimes densely hairy. Flowers small, always somewhat erumpent, often campanulate, white to pale-green. It blooms from October to January, depending on the species, getting right after.