Palynotaxonomy of Vernonanthura H. Rob. (Vernonieae, Asteraceae) species from Southeast Brazil

Abstract

-(Palynotaxonomy of Vernonanthura H. Rob. (Vernonieae, Asteraceae) species from Southeast Brazil). The present work studied the pollinic characteristics of 22 species of Vernonanthura from Southeast Brazil. The pollen grains were acetolysed, measured, described and ilustrated under light, scanning and transmission electron microscopy. Based on the results, Vernonanthura was considered an euripolinic genus as pollen grains presented distinctive characteristics, mainly related to the ornamentation, the size and apertures of the pollen grains, which may serve as a further tool in the delimitation of the species.

Pentacyclic triterpenoids with antimicrobial activity from the leaves of<br>Vernonanthura patens (Asteraceae)

“…On the chemical composition of the species, there are reports of sesquiterpene lactones and sesquiterpenes present in the aerial parts (Mabry, 1975: Jakupovic, 1986). There are some references on Vernonanthura species that shows the presence of diterpene compounds (Portillo, 2005;Valadeau, 2009), flavonoids (Borkosky, 2009;Mendonça, 2009), triterpenes (Tolstikova, 2006;Gallo, 2009), saponins (Borkosky, 2009) and sesquiterpene lactones. In addition, different biological activities have been described assuming that certain chemical groups could be responsible for the therapeutic properties attributed to species of this genus (Pollora, 2003Portillo, 2005;Bardó n, 2007).…”

Phytochemical Studies of Fractions and Compounds Present in Vernonanthura Patens with Antifungal Bioactivity and Potential as Antineoplastic

“…On the chemical composition of the species, reports lack of sesquiterpene lactones and sesquiterpenes present in the aerial parts (Mabry, 1975;Jakupovic, 1986). There are some references on genus Vernonanthura that show the presence of diterpenes compounds (Portillo et al, 2005;Valadeau et al, 2009), flavonoids (Borkosky et al, 2009;Mendonça et al, 2009), triterpenes (Tolstikova et al, 2006, Gallo et al, 2009, saponins (Borkosky et al, 2009) and sesquiterpene lactones. In addition, different biological activities have been described assuming that certain chemical groups could be responsible for the therapeutic properties attributed to species of this genus (Pollora et al, 2003(Pollora et al, , 2004Portillo et al, 2005;Bardon et al, 2007).…”

Vernonia longicuspis (Compositae: Vernonieae), a new combination from Bolivia

“…Apparently the only uniting characters are those of the pollen type, Vernonia type 'B', and the chromosome number, × = 17. Mendonaça et al (2006) have shown that Lessingianthus cannot be categorised by type 'B' pollen alone since type 'C' is also far more prevalent than Robinson (1988) originally indicated. Indeed, Hind (2000a) has also shown that reported data upon which the transfer (to Lessingianthus) of two species was based (V. carvalhoi H. Rob.…”