Now showing items 1-10 of 12
(Vol.12, 2009-12) Iva Corbinii (Asteraceae): A Remarkable New Species From Travis County, Texas
Iva corbinii is described from the Colorado River bottoms of Travis County, Texas, to which it appears restricted. It is a remarkably distinct species, having predominately axillary, single heads; its closest relationship ...
(Vol.12, 2009-12) A New Species of Roldana (Asteraceae) from Southern Oaxaca
Roldana uxordecora is described from Oaxaca, Mexico (Municipio de San Mateo Rı´o Hondo). The genus Roldana is common in the montane regions of the state of Oaxaca (22 species), and this addition to Roldana adds to a list ...
(Vol. 06, 2003-12) Taxonomy of Tetraneuris (Asteraceae: Helenieae: Tetraneurinae)
Tetraneuris is recognized as a genus separate from Hymenoxys and a taxonomic treatment is presented for the 14 taxa recognized as constituting Tetraneuris: T. acaulis var. acaulis, T. acaulis var. arizonica, T. acaulis ...
(Vol. 09, 2006-12) Three New Species of Ageratina (Asteraceae: Eupatorieae) from Oaxaco, Mexico and a Key to the A. Mairetiana Complex
Three new species of Ageratina subg. Neogreenella are described from Mexico, as follows: Ageratina mayajana, from Mpio. San Miguel Chimalapa, Oaxaca; Ageratina mazatecana, from Mpio. Santa Maria Chilchotla, Oaxaca; and ...
(Vol. 09, 2006-12) Mutisieae (Asteraceae) Pollen Ultrastructure Atlas
The tribe Mutisieae (excluding Barnadesieae) traditionally comprises 84 genera and approximately 900 species in three subtribes: Gochnatiinae, Mutisiinae, and Nassauviinae. We examined whole and fractured pollen grains of ...
(Vol. 04, 2001-12) Taxonomy of Hymenoxys Subgenus Picradenia and a Conspectus of the Subgenera of Hymenoxys (Asteraceae: Helenieae: Tetraneurinae)
Hymenoxys (Helenieae, Tetraneurinae) is composed of 28 taxa distributed in 8 subgenera: 1) subg. Hymenoxys, 2) subg. Dugaldia, 3) subg. Macdougalia, 4) subg. Phileozera, 5) subg. Picradenia, 6) subg. Picradeniella, 7) subg. ...
(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.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.