Systematics value of micromorphological and palynological characters in Stenocephalum Sch.Bip. (VErnonieae, Asteraceae).

ANGULO, M. B.; CHALUP, L.; DEMATTEIS, M.

TURKISH JOURNAL OF BOTANY

TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY

Año: 2018 vol. 42 p. 478 - 490

1300-008X

Micromorphological and palynological characters of all Stenocephalum Sch.Bip. species (Vernonieae, Asteraceae) were analyzed to evaluate their reliability as taxonomic markers at generic level and discussed in relation to other genera of the subtribe Lepidaploinae. Characters such as pubescence of corollas and cypselae showed glandular and nonglandular trichomes allowing diferentiation among related species. Apical appendages without glandular trichomes, caudate anthers, and carpopodium structure are common characteristics among Stenocephalum species. With the exceptions of S. megapotamicum and S. tragiaefolium, almost all species of the genus showed style bases without basal nodes for the frst time. Crystals on the fruits wall were also observed for the frst time in almost all the Stenocephalum species, with the exception of S. hystrix. However, the crystals would not constitute diagnostic features, since they vary widely among species. All the species showed type C pollen and the genus is considered stenopalynous. However, highly signifcant diferences in palynological features among the species of the genus were observed. Te diferent combinations of the micromorphological and palynological features of Stenocephalum here analyzed are valuable within genera to diferentiate related species from one another. Te value of all these characters could be increased if they are combined with other morphological or traditional data.