Estudios en Asteraceae de Colombia: primer registro del género Tragopogon L.

As result of recent explorations in the Andean Cordillera Oriental of Colombia, Tragopogon porrifolius L. (Asteraceae: Cichorieae) is reported for the first time for this country. This study provides ecological information, geographic distribution, photographs, and comments about the particular morphological characteristics of the new reported species.Como resultado de exploraciones recientes en la cordillera Oriental andina de Colombia, se registra por primera para el país a Tragopogon porrifolius L. (Asteraceae: Cichorieae). Se presentan la distribución geográfica, aspectos ecológicos y varias fotografías, así como algunos comentarios sobre características morfológicas particulares de esta especie

New Circumspection of the Genus \u3ci\u3eGamochaeta\u3c/i\u3e (Asteraceae, Gnaphalieae) Inferred From Nuclear and Plastid DNA Sequences

Gamochaeta (tribe Gnaphalieae, Asteraceae) is composed of ca. 60 species primarily distributed in tropical and subtropical America. Within the tribe Gnaphalieae, the genus is characterized by capitula arranged in spikes or head-like clusters, few hermaphroditic central florets, truncate style branches with apical sweeping trichomes, pappus bristles connate at the base into a ring falling as a unit, and achenes with globose twin trichomes. Previous molecular phylogenetic studies have suggested the paraphyly of the genus, but have not provided a basis for redefining generic limits due to incomplete taxon sampling. To address this problem, DNA sequences from the plastid (trnL-F) and nuclear (ETS and ITS) genomes were analyzed from a broad taxon sample representing the full range of morphological variation known in the genus. Our results affirm that Gamochaeta is paraphyletic as presently circumscribed. Two clades can be recognized: one clade that includes the majority of the species currently assigned to Gamochaeta and a second clade that includes Gamochaetopsis, Stuckertiella and seven species of Gamochaeta. We present here a new circumscription of Gamochaeta, including two new combinations, Gamochaeta alpina and Gamochaeta peregrina, and the resurrection of Gamochaeta capitata. Our results also show Omalotheca supina, O. norvegica and O. sylvatica, which were placed by some authors in Gamochaeta or in Gnaphalium, form a monophyletic group distantly related to both genera

Catálogo ilustrado de las compuestas (=Asteraceae) de la provincia de Buenos Aires, Argentina: Sistemática, Ecología y Usos.

La familia de la Compuestas (=Asteraceae) es la más numerosa de todas las fanerógamas con aproximadamente 23000 especies y más de 1500 géneros ampliamente distribuidos en todos los continentes excepto en la Antártida. En la República Argentina es la familia más abundante con 222 géneros nativos y 1490 especies, en tanto que en la provincia de Buenos Aires, las compuestas representan la sexta parte de la flora de plantas vasculares con 113 géneros y 356 especies, de las cuales 55 son adventicias y el resto indígenas. Muchas de las especies de esta familia son utilizadas por el hombre como plantas alimenticias o medicinales. Algunas especies son tóxicas para el ganado. Otras son utilizadas como repelentes de insectos o son perjudiciales por ser malezas invasoras en los campos y competir con las plantas cultivadas

ETS+ITS

nuclear molecular matrix (ETS+ITS), nexus forma

Studies in Colombian Asteraceae: first report of the genus Tragopogon L.

As result of recent explorations in the Andean Cordillera Oriental of Colombia, Tragopogon porrifolius L. (Asteraceae: Cichorieae) is reported for the first time for this country. This study provides ecological information, geographic distribution, photographs, and comments about the particular morphological characteristics of the new reported species.Como resultado de exploraciones recientes en la cordillera Oriental andina de Colombia, se registra por primera para el país a Tragopogon porrifolius L. (Asteraceae: Cichorieae). Se presentan la distribución geográfica, aspectos ecológicos y varias fotografías, así como algunos comentarios sobre características morfológicas particulares de esta especie

EPIDERMAL CHARACTERS OF BACCHARIS (ASTERACEAE) SPECIES USED IN TRADITIONAL MEDICINE

<div>A morphological study of 38 species of Baccharis used in traditional medicine</div><div>was carried out to provide some epidermal characters that will contribute to the</div><div>knowledge of the genus. The present study revealed: 1) seven different types of</div><div>trichomes: conical, aseptate fl agellate, fi liform fl agellate, 1-armed, 2-4-armed,</div><div>bulbiferous fl agellate, and glandular biseriate; 2) that 28 of the total of 38 species</div><div>have trichomes in tufts; 3) six different types of stomata: anomocytic, anisocytic,</div><div>cyclocytic, actinocytic, tetracytic, and staurocytic; 4) that some trichome types,</div><div>such as 2-4-armed (B. dracunculifolia) and aseptate fl agellate branched (B. trinervis),</div><div>show a high diagnostic value; 5) that the stomata types can be used to differentiate</div><div>species with similar trichomes type (e.g. B. trimera and B. articulata).</div><div>Illustrations of the studied characters are provided.</div