Do foliage leaves and bracts have usefulness in the separation of stenocephalum (vernonieae, asteraceae) species? / Folhas e brácteas têm utilidade na separação de espécies de stenocephalum (vernonieae, asteraceae)?

Caroline Heinig Voltolini, Luiz Antonio de Souza


It is well known that the leaf structure has usefulness in the Asteraceae taxonomy. Foliage leaves and bracts (involucral bracts) of six Stenocephalum Sch. Bip. species were investigated with the main purpose of indicating characters for diagnose of species. Leaves e bracts were obtained from herbarium and from the rupestrian fields, and sectioned in rotation microtome. Both leaves were investigated using light microscope and scanning electron microscope. Foliage leaves have epidermis with stomata and glandular and non-glandular trichomes, and are dorsiventral. Bracts also have stomata, indumentum, and parenchymatous and sclerenchymatous mesophyll. The structure of the foliage leaves and bracts has little diagnosis value, but the study allowed to separate some species, mainly those closely related within the genus, as S. hexanthum and S. megapotamicum.


Diagnostic value feature, Epidermis, Involucral bracts, Mesophyll.


BREMER, K. 1994. Asteraceae - cladistics & classification. Portland, Timber Press.

CASTRO, M. M.; LEITÃO-FILHO, H. F.; MONTEIRO, W. R. 1997. Utilização de estruturas secretoras na identificação dos gêneros de Asteraceae de uma vegetação do Cerrado. Revista Brasileira de Botânica 20(2): 163-174.

CICCARELLI, D.; GARBARI, F.; PAGNI, A. M. 2007. Glandular hairs of the ovary: a helpful character for Asteroideae (Asteraceae) taxonomy? Annales Botanici Fennici 44(1): 1–7.

DEMATTEIS, M.; ANGULO, M. B. 2008. Taxonomic position and identity of Stenocephalum monticula (Vernonieae, Asteraceae). Blumea 53: 621-626.

DICKISON, W. C. 2000. Integrative Plant Anatomy. San Diego, Academic Press.

FLORA DO BRASIL. 2020. Flora do Brasil 2020 em construção. Jardim Botânico do Rio de Janeiro. Disponível em: . Acesso em: 21 Jul. 2016.

HORRIDGE, G. A.; TAMM, S. L. 1969. Critical point drying for scanning electron microscopy study of ciliary motion. Science 163: 817-818.

KEELEY, S. C.; ROBINSON, H. 2009. Vernonieae – In: Systematics, evolution and biogeography of Compositae, V. A. Funk, A. Susanna, T. F. Stuessey, R. J. Bayer (eds.). Vienna, International Association for Plant Taxonomy. p. 439–469.

MEIRA, R. M. S. A.; MARTINS, F. M. 2003. Inclusão de material herborizado em metacrilato para estudos de anatomia vegetal. Revista Árvore 27: 109-112.

MELO-DE-PINNA, G. F. 2004. Anatomia foliar de Richterago Kuntze (Mutisieae, Asteraceae). Acta Botanica Brasilica 18(3): 591-600.

METCALFE, C. R.; CHALK, L. 1957. Anatomy of the dicotyledons. Vol. 1. Oxford, Clarendon Press.

O’BRIEN, T. P.; FEDER, N.; MCCULLY, M. E. 1964. Polychromatic staining of plant cell walls by toluidine blue. Protoplasma 59(2): 368-373.

REHEM, B. C.; SILVA, A. G. S.; GONÇALVES, D. S.; SILVA, L. A. M.; PAIXÃO, J. L. 2019. Anatomia foliar de duas espécies da família Asteraceae usadas para fins medicinais no sul da Bahia. Brazilian Journal of Development 5(12): 30272-30284.

ROBINSON, H. 1987a. Studies in the Lepidaploa complex (Vernonieae: Asteraceae). I. The genus Stenocephalum Sch. Bip. Proceedings of the Biological Society of Washington 100: 578–583.

ROBINSON, H. 1987b. Studies of the Lepidaploa complex (Vernonieae: Asteraceae). II. A new genus, Echinocoryne. Proceedings of the Biological Society of Washington 100: 584-589.

ROBINSON, H. 1988a. Studies in the Lepidaploa complex (Vernonieae: Asteraceae). IV. The new genus Lessingianthus. Proceedings of the Biological Society of Washington 100: 929-951.

ROBINSON, H. 1988b. Studies in the Lepidaploa complex (Vernonieae: Asteraceae). V. The new genus Chrysolaena. Proceedings of the Biological Society of Washington 100: 952-958.

ROBINSON, H. 1990. Studies in the Lepidaploa complex (Vernonieae: Asteraceae). VII. The genus Lepidaploa. Proceedings of the Biological Society of Washington 103: 464-498.

ROBINSON, H. 1992. A new genus Vernonanthura (Vernonieae,Asteraceae). Phytologia 73: 65-76.

ROBINSON, H. 1999. Generic and subtribal classification of American Vernonieae. Smithsonian Contributions to Botany 89: 1-116.

SMITH, F. H.; SMITH, E. C. 1942. Anatomy of the inferior ovary of Darbya. American Journal of Botany 29: 464 – 471.

SOSA, M. M.; PICCO, G. V.; DEMATTEIS, M. 2013. Comparative anatomy of leaves and stems in some species of the South American genus Chrysolaena (Vernonieae, Asteraceae) and taxonomic implications. Nordic Journal of Botany 000: 001-009.

SOUZA, L. A.; ROSA, S. M.; MOSCHETA, I. S.; MOURÃO, K. S. M.; RODELLA, R. A.; ROCHA, D. C. 2016. Morfologia e anatomia vegetal – técnicas e práticas. Ponta Grossa, Editora UEPG.

STUESSY, T. F.; SPPONER, D. M. 1988. The adaptative and phylogenetic significance of receptacular bracts in the Compositae. Taxon 37(1): 114:126.

THEOBALD, W. L.; KRAHULIK, J. L.; ROLLINS, R. C. 1979. Trichome description and classification. In: Metcalfe, C. R.; Chalk, L. (eds.) Anatomy of the dicotyledons. 2nd edn. Oxford, Oxford Science. p 40–53.

WAGNER, M. A.; LOEUILLE, B. F. P.; SINISCALCHI, C. M.; MELLO-DE-PINA, G. F.; PIRANI, J. R. 2014. Diversity of non-glandular trichomes in subtribe Lychnophorinae (Asteraceae: Vernonieae) and taxonomic implications. Plant Systematic and Evolution 300: 1219-1233.



  • There are currently no refbacks.