Now showing items 11-20 of 24
(Vol. 06, 2003-12) A New Species of Galinsoga (Asteraceae: Millerieae: Galinsoginae) from Northwestern Mexico
Galinsoga crozierae from the state of Durango, northwest Mexico is described and its salient morphological features compared to those of other species in the genus.
(Vol. 03, 2000-12) Phylogenetic Implications of Pollen Morphology and Ultrastructure in the Barnadesioideae (Asteraceae)
The subfamily Barnadesioideae of the Asteraceae consists of nine genera and approximately 90 species. Both molecular and morphological phylogenies indicate that this subfamily is sister to the rest of the family. We have ...
(Vol.10, 2007-12) Pollen Morphology and Ultrastructure of Calyceraceae
Pollen morphology of 13 species from all six genera of Calyceraceae (Acicarpha, Boopis, Calycera, Gamocarpha, Moschopsis, and Nastanthus) and representatives of the Campanulaceae and Goodeniaceae is examined with light ...
(Vol.13, 2010-12) New Taxon in Psacalium (Asteraceae: Senecioneae) From Oaxaca, Mexico
A new peltate-leaved taxon of Psacalium, Psacalium putlanum, is described and illustrated from southwestern Oaxaca, Mexico. It appears to be closely related to the widespread P. peltigerum. Additionally, the closely related ...
(Vol.12, 2009-12) Hymenoxys Ambigens Var. Wagneri (Asteraceae: Helenieae: Tetraneurinae), A New Variety in Hymenoxys Subgenus Plummera from Arizona
Hymenoxys ambigens var. wagneri is a new variety endemic to the Dragoon Mountains of Cochise County, Arizona.
(Vol.10, 2007-12) The Asteraceae of Northwestern Pico Zunil, a Cloud Forest in Western Guatemala
From 2003 to 2005, 46 genera and 96 species of native Asteraceae were collected on the northwestern slopes of Pico Zunil, a montane cloud forest habitat in southwestern Guatemala. Combining the present survey with past ...
(Vol.18, 2015-12) Verbesina Tiburonensis (Asteraceae: Heliantheae), A New Species from Isla Tiburón, Gulf of California, Mexico
Verbesina tiburonensis is a new species from Isla Tiburo´ n, Sonora, Mexico. It is closely related to Verbesina palmeri and V. oligocephala both native to Baja California.
(Vol. 01, 1998-05) Systematic Implications of DNA Restriction Site Variation In Hymenoxys and Tetraneuris (Asteraceae, Helenieae, Gaillardiinae)
Generic delimitation in the Hymenoxys complex has long been problematic. One taxonomic extreme would recognize only Hymenoxys, whereas the other would split the obviously related taxa into as many as eight genera. This ...
(Vol. 08, 2005-12) Taxonomy of Hymenoxys Subgenus Rydbergia (Asteraceae: Helenieae: Tetraneurinae)
Hymenoxys subg. Rydbergia comprises H. brandegeei, H. grandiflora, and H. insignis. The treatment includes a discussion of the original circumscription of the taxa, the description of the genus Rydbergia to accommodate H. ...
(Vol.17, 2014-12) A New Species Of Roldana (Asteraceae) From Huehuetenango, Guatemala
Roldana riparia is described from Huehuetenango, Guatemala (Municipio de Chiantla). The genus Roldana is abundant in montane forests of Guatemala (nine species) and the new species is endemic to the Sierra Cuchumatanes.