IBODA   05360
INSTITUTO DE BOTANICA DARWINION
Unidad Ejecutora - UE
capítulos de libros
Título:
PHYLOGENETIC RELATIONSHIPS OF THE DECUMBENTES GROUP OF PASPALUM, THRASYA, AND
Autor/es:
DENHAM S. S. & F. O. ZULOAGA.
Libro:
Monocots: Comparative Bilogy and Evolution. Poales
Referencias:
Lugar: California; Año: 2006; p. 511 - 527
Resumen:
Paspalum (Poaceae: Panicoideae: Paniceae) includes 330 species distributed mainly in tropical and
subtropical regions of America. Due to the large number of species and convergence in many characters,
an adequate infrageneric classification is still needed. Studies on Paniceae based on molecular
and morphological data have suggested that Paspalum is paraphyletic, including the genus Thrasya,
subtropical regions of America. Due to the large number of species and convergence in many characters,
an adequate infrageneric classification is still needed. Studies on Paniceae based on molecular
and morphological data have suggested that Paspalum is paraphyletic, including the genus Thrasya,
(Poaceae: Panicoideae: Paniceae) includes 330 species distributed mainly in tropical and
subtropical regions of America. Due to the large number of species and convergence in many characters,
an adequate infrageneric classification is still needed. Studies on Paniceae based on molecular
and morphological data have suggested that Paspalum is paraphyletic, including the genus Thrasya,Paspalum is paraphyletic, including the genus Thrasya,
but none of these analyses have included a representative sample of these two genera. In this study,
phylogenetic relationships among the informal group Decumbentes of Paspalum, plus subgenera and
other informal groups, and the genera Thrasya and Thrasyopsis were estimated. A cladistic analysis
under parsimony was performed using a matrix of 50 taxa and 77 morphological and anatomical
characters. Different analytical parameters were explored, equally weighing characters and employing
implied weights by varying the concavity constant, k, from 1 to 12. Almost all analyses showed that
species of the Decumbentes group and Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
under parsimony was performed using a matrix of 50 taxa and 77 morphological and anatomical
characters. Different analytical parameters were explored, equally weighing characters and employing
implied weights by varying the concavity constant, k, from 1 to 12. Almost all analyses showed that
species of the Decumbentes group and Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
other informal groups, and the genera Thrasya and Thrasyopsis were estimated. A cladistic analysis
under parsimony was performed using a matrix of 50 taxa and 77 morphological and anatomical
characters. Different analytical parameters were explored, equally weighing characters and employing
implied weights by varying the concavity constant, k, from 1 to 12. Almost all analyses showed that
species of the Decumbentes group and Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
under parsimony was performed using a matrix of 50 taxa and 77 morphological and anatomical
characters. Different analytical parameters were explored, equally weighing characters and employing
implied weights by varying the concavity constant, k, from 1 to 12. Almost all analyses showed that
species of the Decumbentes group and Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
Paspalum, plus subgenera and
other informal groups, and the genera Thrasya and Thrasyopsis were estimated. A cladistic analysis
under parsimony was performed using a matrix of 50 taxa and 77 morphological and anatomical
characters. Different analytical parameters were explored, equally weighing characters and employing
implied weights by varying the concavity constant, k, from 1 to 12. Almost all analyses showed that
species of the Decumbentes group and Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
under parsimony was performed using a matrix of 50 taxa and 77 morphological and anatomical
characters. Different analytical parameters were explored, equally weighing characters and employing
implied weights by varying the concavity constant, k, from 1 to 12. Almost all analyses showed that
species of the Decumbentes group and Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
Thrasya and Thrasyopsis were estimated. A cladistic analysis
under parsimony was performed using a matrix of 50 taxa and 77 morphological and anatomical
characters. Different analytical parameters were explored, equally weighing characters and employing
implied weights by varying the concavity constant, k, from 1 to 12. Almost all analyses showed that
species of the Decumbentes group and Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
Thrasya form a natural group, supported by the presence of
axillary peduncles in the upper foliar sheath, the upper glume slightly shorter than the spikelet, margins
of the lower lemma plicate on the upper anthecium, and the upper anthecium without simple papillae.
The position of Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.
Thrasyopsis is not clear because it varies within the different analyses. The most
important clades are discussed as well as diagnostic characters usually employed to distinguish the
genera.