Lamarck Rocha

Oxossia is a genus of flowering plants in the subfamily Turneroideae (Passifloraceae) consisting of 15 species. This genus was recently defined in 2019 after a phylogenetic analysis of Turnera justified the creation of the genus.

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Oxossia hatschbachii is a species of shrub in the genus Oxossia (Passifloraceae). It is native to the Atlantic Rainforest near Espírito Santo, Brazil. O. hatchbachii has heterostylous racemose flowers, ranging in color from white to red.

Oxossia calyptrocarpa, a member of Turneroideae (Passifloraceae), is a shrub native to the wet tropics of eastern Brazil. It is found in the Caatinga, Cerrado, and Atlantic forest. It is 0.2-2.5 meter tall with highly plastic leaves and white to lilac flowers. It is a heterostylous species. It was previously classified as Turnera, however, phylogenetic analysis supported its classification as Oxossia.

Oxossia waltherioides is a subshrub in the genus Oxossia (Passifloraceae). It is native to the Amazon Rainforest of Roraima, Brazil.

Oxossia spicata is a shrub in the genus Oxossia (Passifloraceae). It is native to the Atlantic Rainforest of Espírito Santo, Brazil. The species is known from three different populations, however, additional field work is needed to determine the conservation status of O. spicata. Similar to other members of the genus, O. spicata has white distylous flowers. It closely resembles T. albicans, but differs in location and sessile flowers and simple tector trichomes.

Oxossia schomburgkiana is a shrub in the genus Oxossia (Passifloraceae). It is native to the Amazon Rainforest of Brazil. Similar to other members of the genus, O. schomburgkiana has yellow distylous flowers. It can be distinguished from other members of the genus by its chartaceous and wide-elliptic leaves that have tomentose bottoms.

Oxossia rubrobracteata is a shrub in the genus Oxossia (Passifloraceae). It is native to the Atlantic Rainforest of Brazil. Oxosssia rubrobracteata was originally described in 2019, as it morphologically differed from other neighboring members of Turneroideae (Turnera dichotoma and T. revoluta) in the region it was originally identified. Similar to other members of the genus, O. rubrobracteata has distylous flowers. It can be distinguished from other members of the genus due to the reddish / purple color of dried bracts and its pink flowers.

Oxossia princeps is a subshrub in the genus Oxossia (Passifloraceae). It is native to the savanna of Minas Gerais, Brazil. It is considered "rare", but its conservation classification is currently unknown. Similar to other members of the genus, O. princeps has white distylous flowers. It can be distinguished from other members of the genus by its elliptic obovate leaves.

Oxossia pernambucensis is a shrub in the genus Oxossia (Passifloraceae). It is native to the Atlantic Rainforest of Brazil. The species is currently represented by a single population and thus is currently classified as critically endangered. Similar to other members of the genus, O. pernambucensis has white distylous flowers. It flowers from May to January and seeds are dispersed by ants. Morphologically, it is similar to O. capitata and O. dasystla. It can be distinguished from other members of the genus by its fruit which are punctate and lack an apical horn-like appendix.

Oxossia marmorata is a shrub in the genus Oxossia (Passifloraceae). It is native to the Atlantic Rainforest of Brazil. It can be distinguished from other members of the genus by its yellow flowers. Similar to other members of Oxossia, O. marmorata has distylous flowers. As of 2017, O. marmorata was classified as endangered.

Oxossia maracasana is a shrub in the genus Oxossia (Passifloraceae). It is native the Caatinga regions and Atlantic forest near Bahia, Brazil. It has white heterostylous flowers. Oxossia maracasana can be distinguished from other members of Oxossia due to its 0.2-0.3m extrafloral nectaries that are accompanied by a pair of leaves or leaves are absent. Additionally, it has a 7-9 mm calyx and 11-14 mm long corolla. As of 2017, O. maracasana is considered endangered.

Oxossia hebepetala is shrub in the genus Oxossia (Passifloraceae). It is native to the Caatinga of Bahria and Piauí, Brazil. Oxossia hebepetala is distinguished from other members of Oxossia due to its con-color, obovate, dentate leaves, which have 1-4 pairs of teeth, and its seeds which lack a point depression.

Oxossia dasystyla is a shrub native to southeast Brazil. It is native to the jungles and surrounding fields of Minas Gerais; specifically the Caatinga and Atlantic Forest. Oxossia dasystyla has white "horny" homostylous racemous flowers and reddish glabrous branches. It is semidecidous, flowers in December, and fruit sets in January. It differs from other members of Oxossia due to its ovate leaves, petals without ligules, and ovate bracts.

Oxossia capitata is a shrub native to the wet tropics of southern Brazil. It was previously classified as Turnera, however, recent phylogenetic analyses suggested the species should be placed in Oxossia. O. capitata has heterostylous white pointed flowers.

Oxossia annularis is a shrub of Oxossia Turneroideae (Passifloraceae) native to eastern Brazil. It is found in Caatinga, Cerrado, and Atlantic Forest.

Oxossia albicans is a subshrub in the genus Oxossia (Passifloraceae subfamily Turneroideae). It is native to the wet tropics of eastern Brazil, specifically the Atlantic forest.

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