Estrella Urtubey,

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• - at Instituto de Botanica Darwinion

Based on molecular phylogenetic studies, Barnadesioideae have been proposed to be the basal subfamily of Asteraceae. This is a complex of 10 genera and 87 species distributed primarily along the Andean mountains, Patagonia, and into southern Brazil and Uruguay. Phylogenetic analyses have recovered all genera as monophyletic groups and have provided...

Based on molecular phylogenetic studies, Barnadesioideae have been proposed to be the basal subfamily of Asteraceae. This is a complex of 10 genera and 87 species distributed primarily along the Andean mountains, Patagonia, and into southern Brazil and Uruguay. Phylogenetic analyses have recovered all genera as monophyletic groups and have provided...

As part of studies on South American Hieracium subg. Chionoracium, sect. Piloselliformia (Asteraceae: Cichorieae) in the present work are proposed four lectotypifications, one neotypification, and comments regarding previous nomenclatural decisions within the group.

Asteraceae subfamily Barnadesioideae (ten genera, c. 90 species), confined to South America, are sister to the remainder of the family. The relative antiquity of the barnadesioids might lead one to expect that they contain more wood features plesiomorphic for the family, but only one character clearly falls in that category. Pits on imperforate tra...

We performed an integrated phylogeographical and palaeoclimatic study of an early-diverging member of Asteraceae, Duseniella patagonica, endemic to Argentina. Chloroplast and nuclear markers were sequenced from 106 individuals belonging to 20 populations throughout the species range. We analysed genetic spatial distribution, diversity and structure...

Morphological features of the heads (capitula) of Asteraceae have been used extensively in classification of the family at different levels of the taxonomic hierarchy. Among the various characters, features of stamens have been employed to determine relationships from specific to tribal levels, including size, shape, colour, cell size and shape of...

The genus Hypochaeris was likely introduced into South America by a unique long-distance dispersal event from an ancestral Northwest African species, with subsequent radiation and diversification throughout the temperate zones of the continent. Hypochaeris catharinensis is an endemic species of Southern Brazil growing mostly in high-elevation grass...

Hieracium reitzianum Cabrera ex Urtubey, a new species of Asteraceae from southeastern Brazil, is described and illustrated. This species is placed within section Hypochaeridiformia (Arv.-Touv. ex Peter) Zahn (subgenus Chionoracium Sch. Bip.) by the presence of ciliate corolla lobes. It is most readily distinguished from other species of the sectio...

Chryselium Urtubey & S. E. Freire, a new monotypic genus, is here described and illustrated to accomodate one species that was initially placed in Helichrysum, H. gnaphalioides, as Chryselium gnaphalioides. The new genus, Chryselium, is a monoecious herb with single stems and terminal capitulescences that are densely glomerulate from the Tropical A...

ABSTRACT. This revision treats the 41 South American species of Hypochaeris, plus the northwest African H. angustifolia, all now placed in a single monophyletic section Phanoderis. The New World species constitute subsection Phanoderis, and the single African species comprises subsection Africana. The species in South America represent a challenge...

Premise of the study We developed microsatellite markers to study clonal growth and interspecific hybridization in the Patagonian and subantarctic plant Hypochaeris incana (Asteraceae) and its closest relatives. Methods and Results We developed primers for microsatellite loci from 454 sequence reads of genomic DNA of H. incana. We tested them on i...

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...

The genus Hypochaeris has a recent evolutionary history caused by long-distance dispersal in conjunction with adaptive radiation in the South American continent. Hypochaeris lutea is a perennial herb that grows mostly at altitudes of around 1000 m in cold swamps of the southern regions of Brazil. We investigated the amplified fragment length polymo...

The Lucilia group sensu Anderberg and Freire comprises nine South American genera: Belloa, Berroa, Chevreulia, Cuatrecasasiella, Facelis, Gamochaetopsis, Jalcophila, Lucilia and Luciliocline. The aims of this contribution were, using DNA sequences from plastid (rpl32-trnL, trnL-F) and nuclear (ITS and ETS) markers, together with morphological chara...

A taxonomic revision of Oxalis section Palmatifoliae is presented, together with cluster analyses to clarify the limits of the species. This monophyletic section includes five species endemic from Southern Argentina and Chile. A key for the species, descriptions, illustrations, synonymy, and geographical distribution for each species are also provi...

Gamochaeta beckii, a new species found in La Paz, Bolivia is described and illustrated. Gamochaeta beckii is similar to G. purpurea but it is easily distinguished by stems branched from the base to the inflorescence, oblanceolate leaves, the small capitula arranged in glomerules, forming leafy short and continuous spikes, and short acuminate inner...

Gamochaeta beckii, a new species found in La Paz, Bolivia is described and illustrated. Gamochaeta beckii is similar to G. purpurea but it is easily distinguished by stems branched from the base to the inflorescence, oblanceolate leaves, the small capitula arranged in glomerules, forming leafy short and continuous spikes, and short acuminate inner...

Hypochaeris is an excellent system for studying different modes of chromosome evolution in plants. We carried out a cytogenetic analysis on populations of two Hypochaeris species, comprising 10 populations of H. catharinensis and five of H. lutea, to assess possible changes on chromosome organization in this interesting genus. Conventional Feulgen...

The genus Hypochaeris offers an excellent model for studies of recent adaptive radiation in the South American continent. We used karyotype analysis with chromomycinA3 (CMA3)/4’,6-diamidino-2-phenylindole (DAPI) banding and fluorescence insitu hybridization (FISH), and amplified fragment length polymorphism (AFLP) fingerprinting to investigate for...

In order to elucidate the biotic diversification of Asteraceae inhabiting the South American Transition Zone, we undertook a panbiogeographic analysis (based on a parsimony analysis of endemicity) and a cladistic biogeographic analysis. The study units were the six biogeographic provinces of this zone plus the seven subregions of the Neotropical an...

In order to elucidate the biotic diversification of Asteraceae inhabiting the South American Transition Zone, we undertook a panbiogeographic analysis (based on a parsimony analysis of endemicity) and a cladistic biogeographic analysis. The study units were the six biogeographic provinces of this zone plus the seven subregions of the Neotropical an...

El complejo Hypochaeris sessiliflora comprende nueve especies de Sudamérica (sección Achyrophorus Scop.) con cabezuelas sésiles o cortamente pedunculadas y con una roseta de hojas basales. Habitan entre los 1430–5100 m a lo largo de los Andes desde Venezuela hasta el centro de Chile y el centro oeste de Argentina. Dos especies, H. sessiliflora Kunt...

We report the phylogeographic pattern of the Patagonian and Subantarctic plant Hypochaeris incana endemic to southeastern South America. We applied amplified fragment length polymorphism (AFLP) and chloroplast DNA (cpDNA) analysis to 28 and 32 populations, respectively, throughout its distributional range and assessed ploidy levels using flow cytom...

We used Amplified Fragment Length Polymorphism markers (AFLP) and breeding system studies to investigate the population structure and reproductive biology of Hypochaeris angustifolia (Asteraceae: Cichorieae). This species is endemic to altiplanos of the Atlas Mountains (Morocco) where it occurs in scattered populations, and it is the sister species...

Subfamily Barnadesioideae (Asteraceae) consists of nine genera and 91 species endemic to South America. They include annual and perennial herbs, arching shrubs and trees up to 30m tall. Presumed sister to all other Asteraceae, its intergeneric relationships are key to understanding the early evolution of the family. Results of the only molecular st...

Hypochaeris is thought to have arrived in South America by dispersal over the Atlantic Ocean from NW Africa during the Pliocene or Pleistocene. We used amplified fragment length polymorphism (AFLP) to unravel specific limits and relationships in the South American group of Hypochaeris (c. 45 species). The Moroccan endemic Hypochaeris angustifolia,...

We report the phylogeographic pattern of the Patagonian and Subantarctic plant Hypochaeris incana endemic to southeastern South America. We applied amplified fragment length polymorphism (AFLP) and chloroplast DNA (cpDNA) analysis to 28 and 32 populations, respectively, throughout its distributional range and assessed ploidy levels using flow cytom...

In an attempt to delineate the area of origin and migratory expansion of the highly successful invasive weedy species Hypochaeris radicata, we analysed amplified fragment length polymorphisms from samples taken from 44 populations. Population sampling focused on the central and western Mediterranean area, but also included sites from Northern Spain...

RESUMEN Se entregan datos citológicos del número cromosómico diploide de 24 especies de la flora vascular de Chile, utilizándose material de raíces provenientes de plántulas. Nuevos registros para la flora de Chile son: Alstroemeria presliana Herb. subsp. presliana (2n = 16), Chaetanthera moenchioides Less. (2n = 26), Hypochaeris scorzonerae (DC.)...

RESUMEN Se entregan datos citológicos del número cromosómico diploide de 24 especies de la flora vascular de Chile, utilizándose material de raíces provenientes de plántulas. Nuevos registros para la flora de Chile son: Alstroemeria presliana Herb. subsp. presliana (2n = 16), Chaetanthera moenchioides Less. (2n = 26), Hypochaeris scorzonerae (DC.)...

A morphological study of 38 species of Baccharis used in traditional medicine was carried out to provide some epidermal characters that will contribute to the knowledge of the genus. The present study revealed: 1) seven different types of trichomes: conical, aseptate flagellate, filiform flagellate, 1-armed, 2-4-armed, bulbiferous flagellate, and g...

One hundred and thirty-seven new chromosome counts are reported from 104 populations of 26 native South American taxa of Hypochaeris (Asteraceae, Lactuceae), together with two invasive Mediterranean species: H. glabra and H. radicata. First reports are provided for seven taxa (H. alba, H. cf. eremophila, H. caespitosa, H. hookeri, H. parodii, H. pa...

Chromosome numbers of 24 Chilean taxa of vascular plants were studied using root-tip mitotic metaphases. New records for the Chilean Flora are: Alstroemeria presliana Herb, subsp.presliana (2n = 16), Chaetantheramoenchioides Less. (2n = 26), Hypochaeris scorzonerae (DC.) F.Muell. (2n = 8), Phycella bicolor (Ruiz et Pav.) Herb. (2n = 16) and Rhodoph...

The genus Hypochaeris (Asteraceae, Lactuceae) contains twelve species in Europe, three in Asia, and approximately 50 in South America. In this paper, we worked with mitotic chromosomes of three different species of Hypochaeris from Chile: H. acaulis, H. incana and H. scorzonerae. The species are very different in morphology and geographic distribut...

Este es el primer análisis florístico completo de la familia Asteraceae para un área subtropical de Argentina, extensa y en peligro de conservación, delimitada por la provincia de Misiones. Este estudio registra 88 géneros, 345 especies y 16 taxones infraespecíficos de la familia Asteraceae para las dos unidades fitogeográficas de esta provincia: l...

This is the first complete, floristic analysis of the Asteraceae family from an extense, endangered, subtropical area of Argentina, covered by the Misiones Province. This study reports 88 genera, 345 species and 16 infraspecific taxa of Asteraceae from the two phytogeographic units of Misiones Province: "Selvas Mixtas" District, and "de los Campos"...

The previously insignificant and small South American subtribe Barnadesiinae of tribe Mutisieae has been shown recently to be ancient within Asteraceae. Due to absence of a 22kb diagnostic chloroplast inversion, plus other features, this subtribe has been elevated to subfamilial status as Barnadesioideae, now containing 90 species in nine genera. R...

One hundred and eighty species belonging to 41 families inhabiting the Salado River Basin of the province of Buenos Aires (Argentina) were previously reported to be toxic for cattle. The purpose of this study was to provide a tool to distinguish the taxa when the plant material is desintegrated. In this way, an approach to the identification of the...

Pollen of Proustia (10 specimens examined) and Lophopappus (12 specimens examined) (Asteraceae, Mutisieae) are described as part of an analysis of the classification of these genera. Their exine structure is determined and compared with structures found in other genera of Mutisieae (25 specimens examined and data of other authors), in order to clar...

Previous molecular sequence and restriction site data have confirmed subfamily Barnadesioideae as basal within Asteraceae. The subfamily consists of 88 species in nine genera: Arnaldoa, Barnadesia, Chuquiraga, Dasyphyllum, Doniophyton, Duseniella, Fulcaldea, Huarpea, and Schlechtendalia. Two morphological cladistic analyses among genera or subgener...

The present paper is the fifth (last) part of the review of medicinal Compositae of the Pampean biogeographic province (east of Argentina, Uruguay, and the Southern half of the Río Grande do Sul state of Brazil), and represents the sixth and seventh of the seven groups delimited in the part I. These groups are characterized by its capitula with dim...

The present paper is the fourth part of medicinal Compositae of the Pampean biogeographic province (east of Argentina, Uruguay, and the Southern half of the Rio Grande do Sul state of Brazil), and represents the fifth artificial group of the seven groups delimited in the Part 1 of this series. This group is characterized by its capitula with dimorp...

The present paper is the thirth part of medicinal Compositae of the Pampean biogeographic province (east of Argentina, Uruguay, and the Southern half of the Rio Grande do Sul state of Brazil) and represents the fourth artificial group of the seven groups delemited in part I. This group is characterized by its capitula with isomorphic florets and pa...

Barnadesia is a South American genus with 18 species of trees and shrubs, mainly distributed in the Andes. This work represents a modem revision, which comprises taxonomic and phylogenetic aspects. The taxonomic aspect includes a description and history of the genus, keys for identification of the genera of the subfamily Barnadesioideae and the spe...

There are 154 species and 12 varieties of Compositae (Angiospermae) with medicinal uses in the Pampean biogeographic province (east of Argentina, Uruguay and the southern half of the Rio Grande do Sul state, Brazil). In order to contribute to their identification, the species were arranged in seven artificial groups: (1) Compositae spinulose (stem,...

The present paper is the second part of medicinal Compositae of the Pampean biogeographic province (east of Argentina, Uruguay, and the Southern half of the Rio Grande do Sul state of Brazil), and represents the third artificial group of the seven groups delimited in the part I. This group is characterized by its capitula with isomorphic florets an...

The pollen morphology of 59 species of the genera Arnaldoa, Barnadesia, Chuquiraga, Dasyphyllum, Doniophyton, Duseniella, Fulcaldea, Huarpea and Schlechtendalia belonging to the Barnadesioideae has been studied with light and scanning electron microscopy. Three main pollen types were recognized: (1) lophate pollen found in Barnadesia and Huarpea; (...

Se describen los viajes de estudio a ambas regiones