Squares can be defined as free urban spaces used as public places, which should be prioritized within urban planning, in order to assume its role as a green area, becoming a place of coexistence and reaching its socio-environmental function. The management and management of these areas depend directly on their detailed phytosociological knowledge. From this, the objective of this work was to study the floristic composition of the Square of the Sunflowers in the city of Palmas - TO. The inventory of all the trees present in the Square of the Sunflowers, considering all the arboreal individuals with CAP (chest height circumference, 1,30 m of the soil) equal to or greater than 20 cm were identified for the botanical family, name Scientific name, popular name, origin (native or exotic) as well as phytosanitary status, endemism and threat of extinction. After the data collection, we calculated the diversity index proposed by Shannon-Weiner (H '), the wealth proposed by Odum (d) and the uniformity calculation proposed by Pielou (J). 1514 arboreal specimens were identified, belonging to 29 botanical families, 75 genera and 89 species, of which 20 are exotic and 69 are native. The most abundant species were Handroanthus heptaphyllus (Vell.) Mattos, 78% of the species were classified as native, 56 species (62.92%) belonging to the Cerrado phytogeographic domain and 34 (38.20%) Occurrence confirmed in Tocantins. Endemism was confirmed in 16 species (18%), with Parkia platycephala Benth. with greater number of individuals (146). Among the species found, two appear to be endangered: Paubrasilia echinata (Lam.) E. Gagnon, H.C. Lima & G.P. Lewis and Swietenia macrophylla King. It is concluded that the Square of Sunflowers presents good diversity indexes: (H '= 4.95) (D' = 0.95), richness (d = 27.67), uniformity (J = 0.76) and phytosanitary (93.20% of healthy trees), besides having a strong identity of the phytogeographic domain in which it is inserted.
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