ABSTRACT
Asteraceae is one of the largest families among angiosperms, concentrated mainly in open vegetation. This study aims to survey the floristic inventory of Asteraceae in fragments of Atlantic Forest of Usina São José (USJ), Igarassu, Pernambuco State, providing subsidies for an updated taxonomic recognition of species in the region. In total, 32 species from 27 genera and 10 tribes were identifield. The tribes with the greatest number of species are Eupatorieae (8 spp.), Vernonieae (7 spp.) and Heliantheae (6 spp.). The most representative genera were Mikania (3 spp.), Acanthospermum, Elephantopus and Emilia (2 spp. each). Gamochaeta pensylvanica presents here the first occurrence for the State of Pernambuco. Identification key is presented, followed by taxonomic comments and geographic distribution for each taxon, and illustrations are presented.
Keywords:
Atlantic rainforest; Compositae; floristic; lowland; taxonomy
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Figure 1. a. Map with the location of the study area, Usina São José, Igarassu, Pernambuco State, Brazil. b. Atlantic Forest fragments sampled of Usina São José, Igarassu, Pernambuco: 1. Zambana. 2. Cruzinha. 3. Vespa. 4. Dedo de Deus. 5. Macacos. 6. Pezinho. 7. Santa Helena. 8. BR. 9. Chave. 10. Piedade (after 
Figure 2. Diagnostic characters of species of the Asteraceae family at Usina São José, Igarassu, Pernambuco State, Brazil. a-b. Acanthospermum australe (Loefl.) Kuntze, a. Leaf blade. b. Cypsela. c-d. Acanthospermum hispidum DC., c. Leaf blade. d. Cypsela. e-f. Ageratum conyzoides L., e. Capitulum. f. Cypsela with pappus. g-j. Bidens pilosa L., g. Leaf blade. h. Ligulate corolla of ray florets. i. Tubular corolla of disk florets. j. Cypsela with pappus. k-m. Blainvillea acmella (L.) Philipson, k. Capitulum. l. Paleae. m. Cypsela with pappus. n-o. Centratherum punctatum Cass., n. Capitulum. o. Cypsela with pappus. p-r. Chromolaena odorata (L.) R.M.King & H.Rob., p. Leaf blade. q. Capitulum. r. Cypsela with the lower part of the pappus. s-u. Conocliniopsis prasiifolia (DC.) R.M.King & H.Rob., s. Leaf blade. t. Capitulum. u. Cypsela with the lower part of the pappus. v-y. Conyza sumatrensis (Retz.) E.Walker, v. Capitulescence. w. Capitulum. y. Cypsela with pappus. x-z1. Cyrtocymura scorpioides (Lam.) H.Rob., x. Capitulescence. z. Capitulum. z1. Cypsela with pappus.
Figure 3. Diagnostic characters of species of the Asteraceae family at Usina São José, Igarassu, Pernambuco State, Brazil. a-b. Eclipta prostrata (L.) L., a. Capitulum. b. Cypsela with pappus. c-d. Elephantopus hirtiflorus DC., c. Capitulescence. d. Cypsela with the lower part of the pappus. e-f. Elephantopus mollis Kunth, e. Capitulescence. f. Cypsela with the lower part of pappus. g-h. Emilia fosbergii Nicolson, g. Leaf blade lower. h. Capitulum. i-j. Emilia sonchifolia (L.) DC. ex Wight, i. Leaf blade lower. j. Capitulum. k-l. Erechtites hieracifolius (L.) Raf. ex DC., k. Leaf blade. l. Capitulum. m-o. Gamochaeta pensylvanica (Willd.) Cabrera, m. Leaf blade. n. Capitulum. o. Cypsela with the lower part of the pappus. p-r. Gymnanthemum amygdalinum (Delile) Sch.Bip. ex Walp., p. Leaf blade. q. Capitulum. r. Cypsela with the lower part of the pappus. s-u. Melanhera latifolia (Gadner) Cabrera, s. Leaf blade. t. Paleae. u. Cypsela with pappus. v-w. Mikania cordifolia (L. f.) Willd., v. Leaf blade. w. Capitulescence. y-x. Mikania duckei G.M.Barroso, y. Leaf blade. x. Capitulescence. z-z1. Mikania glomerata Spreng., z. Leaf blade. z1. Capitulescence.
Figure 4. Diagnostic characters of species of the Asteraceae family at Usina São José, Igarassu, Pernambuco State, Brazil. a-c. Platypodanthera melissifolia (DC.) R.M.King & H.Rob., a. Leaf blade. b. Floret. c. Cypsela with pappus. d-f. Porophyllum ruderale (Jacq.) Cass., d. Leaf blade. e. Capitulum. f. Cypsela with pappus. g-h. Praxelis clematidea (Griseb.) R.M.King & H.Rob., g. Capitulum. h. Cypsela with the lower part of the pappus. i-k. Pterocaulon alopecuroides (Lam.) DC., i. Capitulescence. j. Winged branch detail. k. Capitulum. l-n. Rolandra fruticosa (L.) Kuntze, l. Capitulescence. m. Capitulum. n. Cypsela with pappus. o-p. Sphagneticola trilobata (L.) Pruski, o. Leaf blade. p. Cypsela with pappus. q-s. Tilesia baccata (L.) Pruski, q. Ligulate corolla of ray floret. r. Disk floret. s. Cypsela. t-v. Tridax procumbens L., t. Leaf blade. u. Capitulum. v. Cypsela with the lower part of pappus. w-y. Verbesina macrophylla (Cass.) S.F.Blake, w. Capitulum. y. Winged Cypsela with pappus. x-z. Vernonanthura brasiliana (L.) H.Rob., x. Capitulum. z. Cypsela with the lower part of the pappus.