Revision of Vernonia Section Eremosis (Compositae) in North America

1 April 1973

journal article
Published by Springer Nature in Brittonia

Vol. 25 (2) , 86-115
https://doi.org/10.2307/2805929

Abstract

A taxonomic treatment based upon morphology is presented for the recognized North American species ofVernonia sect.Eremosis (DC.) Benth. & Hook. Keys, synonymies, descriptions, typifications, and range maps or specimen citations are given for the 20 species in the section. A new species,V. macvaughii, is described from Oaxaca, Mexico.V. obtusa ssp.parkeri is described as new from Hidalgo, Mexico, andVernonia duncanii ssp.duncanii and ssp.bartlettii are described from Tamaulipas, Mexico. Two changes in rank are made:V. palmeri is reducedto V. triflosculosa ssp.palmeri, andV. salicifolia var.baadii is raised toV. baadii. One taxon,V. calderonii, is shown to be of hybrid origin. Sect.Critoniopsis (Sch. Bip.) Benth. & Hook. is combined with sect.Eremosis (DC.) Benth. & Hook. Chromosome numbers of n = 17, 18, 19, 36, and 37 ± 1 are reported. The sesquiterpene lactones, glaucolides A, B, C, D, E, F, and G, are found in the section.

Keywords

This publication has 0 references indexed in Scilit: