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This paper deals with the systematic study of the genera Calycorectes, Hexachlamys, Myrciaria, Paramyrciaria, Plinia and Siphoneugena, which represent the subtribe Eugeniinae Berg, in the Argentine flora The paper also present an enlargement of the area of distribution of Myrciaria tenella (DC.) Berg, which up to now has only been mentioned in the NW of Argentina. Paramyrciaria delicatula (DC.) Kausel is accepted instead of Myrciaria delicatula (DC) Berg, because this species has embryo with two plane-convex cotyledons and a circumcised, elongated hypanthium The new combination Plinta baporeti (Legrand) Rotman, is proposed for a species caracteristic of galleria forests The name Plinia trunciflora (Berg) Kausel has been accepted, in its author's true sense, for a species which up to now has only once been collected in Argentina. Descriptions and illustrations of every species of Hexachlamys, Siphoneugena and Calycorectes are given. Guapurium peruvianum Poir, remains as an entity of doubtful taxonomic position. It has been collected on many an opportunity, but its embryonic morphology is difficult to interprete because it shows polyembryos which, so far, have not allowed correct interpretation of this entity. [ABSTRACT FROM AUTHOR]

Azorella is a genus with 26 species of Azorelloideae (Apiaceae) that grow from Costa Rica to the subantartic islands, being distintive and dominant in different environments of the Andean Cordilleras from Venezuela to Patagonia. The species of Azorella that grow in Argentina have been revised taxonomically in a previous study. However, knowledge of the remaining species is fragmentary and uneven. The aim of this paper is to update and standardize the information of the 11 species of Azorella absent in Argentina and present in Bolivia, Chile, Colombia, Ecuador, Peru and/or Venezuela. We provide descriptions for those species and update distributional maps, and we solve nomenclatural and typification problems for 41 names, designating 2 type species, 16 lectotypes and 1 neotype. In addition, we provide 10 new illustrations, and an identification key for all the species of the genus. [ABSTRACT FROM AUTHOR]

Hieracium x stoloniflorum, native from central Europe and northwestern Russia and reported as a putative hybrid between H. aurantiacum and H. pilosella, is first documented for the Argentinian flora. This paper describes this weed and informs about its presence in Río Negro province. [ABSTRACT FROM AUTHOR]

This paper proposes the observation of anatomical features associated with water deficiency in wood as paleoenvironmental indicator. The analysis was applied to charcoal recovered in late archaeological contexts of Aguada in Ambato Valley, Catamarca (Argentina). Based on the correlation between the anatomical structure of wood and the habitat, the observations were done on present-day and archaeological samples of Geoffroea decorticans. Results show arid conditions in the study area at the end of the first millennium. [ABSTRACT FROM AUTHOR]

This paper analyzes the Zea mays racial variability and their relationship with the greater emphasis put on agricultural practices in the Southern Argentine "Puna" during ca. 1300-700 years BP, taking in account the archaeobotanical record of the sites "Cueva Cacao 1A" and "Bajo del Coypar II" ("Antofagasta de la Sierra", Catamarca, Argentina). Eight maize races were identified: Pisincho, Morocho, Morocho amarillo, Marrón, Harinoso Amarillo, Capia, Culli and Chullpi. This high biodiversity is a clear exponent about the introduction process of multiple maize races in the region. This process would have begun between the end of Formative Period in any moment among 1300 and 1000 years BP and becoming stronger in later moments. [ABSTRACT FROM AUTHOR]

This paper is a taxonomic study of the Argentinean species of the genus Elaphoglossum (E. crassipes, E. gayanum, E. lindbergii, E. lorentzii, E. pachydermum, E. piloselloidesand E. yungense), based on morphological characters of the sporophyte. The history of the genus and the description of the species are provided, along with synonymy, comments on geographical distribution, habitat and a list of the studied specimens. Akey to identify the species is also given. [ABSTRACT FROM AUTHOR]

We studied the different ways of plant use among the Selknam from Tierra del Fuego (Argentina). In this paper we present the results obtained from the study of carbonized and non carbonized wood remains recovered at Ewan site, which was occupied at the beginning of the XXth century to celebrate an initiation ceremony. Results allowed a better understanding of the strategies of plant use in hunter- gatherer societies. The identification of the species used, and the analysis of their principal morphometric characteristics characterize the use of the "Ñire" (Nothofagus antarctica). This species, dominant in the surroundings, was used to build the dwelling as well as for fuel. For both uses, stems with suitable form and size were selected. Archaeobotanical results and their confrontation with the ethnographic data support the importance of vegetable resources within the socio-economic dynamics of the selknam society. Vegetable resources, beyond their use as food, were important in other aspects, such as technology, hut construction, fuel, and they certainly represented a considerable advantage in the area of the forests of the central zone of Tierra del Fuego. [ABSTRACT FROM AUTHOR]

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" District. Nine species are recorded for first time, and 23 are included as probable records for this area. This paper includes keys for tribes, genera, species and infraspecific taxa, as well as a short discussion about distribution of tribes, genera and habits in relation to political departments or phytogeographic districts. Habit, status, distribution, habitat, vernacular names, uses, and vouchers are given for every taxon. Thirty two taxa are illustrated for the first time. [ABSTRACT FROM AUTHOR]

This paper comprises a synopsis of the species of Alchornea growing in Argentina. These species are Alchornea castaneifolia, A. sidifolia and A. triplinervia, and one subspecies- A. glandulosa subsp. iricurana. A key to recognize the species and the subspecies, as well as descriptions, synonymy, illustrations and comments on the taxa studied are given. Alchornea sidifolia and A. glandulosa subsp. iricurana are new records for Argentina. [ABSTRACT FROM AUTHOR]

The genus Aristida is represented in northwestern Argentina by section Chaetaria with 23 taxa: 18 species and 5 varieties. Aristida nicorae sp. nov., A. victoriana sp. nov. and A. asplundii var. pauciflora var. nov. are described and illustrated. Aristida laxa var. longiramea and A. friesii are two new records for Argentina. Aristida achalensis var. tucumana, A. adscensionis var. bromoides, A. amplexifolia and A. mandoniana are considered synonyms. Aristida divaricata is excluded from the Argentine flora. This paper includes a key to recognize all species and varieties that grow in northwestern Argentina, as well as descriptions, synonymy, illustrations, geographical distribution and ecological observations. [ABSTRACT FROM AUTHOR]

The genus Baccharis is represented in Argentina by 96 species, the infrageneric classification of which is presented in this paper. A succinct summary of the history of Baccharis infrageneric taxonomy is provided. The 96 Argentine species are placed into 15 sections: Angustifoliae, Aristidentes, Baccharis, Caulopterae, Cuneifoliae, Cylindricae, Discolores, Molinae, Nitidae, Oblongifoliae, Paniculatae, Pedicellatae, Pseudobaccharis, Subliguliflorae -sect. nov.- and Trinervatae. These sections are briefly described, and a key to differentiate them is given. Twelve out of the 96 species are positioned into the infrageneric classification system for the first time, whereas 42 species which had been previously classified are here relocated to other sections. Twenty-two generic, subgeneric, sectional and subsectional names are considered as new synonyms. The relationships among the sections are discussed. [ABSTRACT FROM AUTHOR]

This paper deals with the epiphytic algae found in a channel and in an artificial pond in Estación Experimental INTA Delta (Buenos Aires, Argentina). These algae are in relation with a carp population that feeds on them in their early stages. A total of 21 taxa were identified. One was a new taxon, Uronema elongatum Hoodgetts var. robustus L. Mercado et Vigna, and six are new records for Argentina. Among the Cyanophyceae, the 60% were associated algae whereas the rest were epiphytic on emergent macrophytes. The coccoid Xantophyceae were found on filamentous Chlorophyceae, whereas the filaments themselves were epiphytic on emergent macrophytes. [ABSTRACT FROM AUTHOR]

The diatom flora of Paso de las Piedras reservoir and affluents, Buenos Aires Province, was studied. In this paper we present those species and varieties that belong to the families Diatomaceae, Achnathaceae and Eunotiaceae. Each taxon, studied with light and/or scanning electron microscope, is described and ilustrated. The taxonomic information is completed with references about geographic distribution and ecological requirements. Diatoma moniliforme Kützing, a new record for Argentina and South America is included. A brief characterization of the study area and methodology are also given. [ABSTRACT FROM AUTHOR]

This is the third paper of a series of chemotaxonomic studies of the subtribe Phaseolinae in Argentina, which comprises the generic complex Phaseolus-Vigna-Macroptilium and the nearly genus Dolichopsis. Chromatographic patterns of 1 species of the genus Dolichopsis and 3 species of the genus Phaseolus were determined, including Phaseolus vulgaris var. aborigineus and primitive landraces and wild forms of Merlo (San Luis), the southernmost locality ever reported for the common bean Cluster analysis and ordination by principal coordinates analysis were applied to 31 chemical characters («spots»). These results corroborate the taxonomic position of these species, according to Maréchal, Mascherpa & Stainier (1978) and Lackey (1977, 1983), who proposed the section Euphaseolus, and supported the fact that Dolichopsis is a genus relatively distant from Phaseolus, and more closely related to Vigna and Strophostyles. [ABSTRACT FROM AUTHOR]

Three genera and nineteen species of foliose Physciaceae from Buenos Aires Province are studied. Their common features are summarized and main morphological variability illustrated Generic descriptions are provided. Species are briefly described, commented and illustrated Problems related to the identification of some secondary products, the anatomy and histology of thalli and apothecia, and the vegetative propagules, as well as the corresponding terminology, are discussed The Importance of an adequate methodology for studying the thallus structure is stressed. Keys to genera and species have been published in an earlier paper (Bol. Soc. Argent. Bot. 28: 169-173, 1992). [ABSTRACT FROM AUTHOR]

This is the second paper of a chemotaxonomic serial study of the subtribe Phaseolinae Benth. in Argentina, which comprises the generic complex Phaseolus-Vigna-Macroptilium. Chromatographic patterns of 8 species of the genus Vigna Savi were determined. Cluster analysis and ordination by principal coordinates analysis were applied to 34 chemical characters (flavonoids). Chemical evidence seems to support the taxonomic treatment proposed by Maréchal, Mascherpa & Stainier (1978b) for the American Vigna. Argentinian species of the large subgenus Sigmoidotropis can be grouped according to the sections proposed by these authors. Taxonomic distance between V. peduncularis and V. luteola, the only pantropical representative of the typically African subgenus Vigna, suggested that the section Pedunculares of the subgenus Sigmoidotropis is the nexus between these two groups. Closely related to Sigmoidotropis, the subgenus Lasiospron shows a different affinity with the section Caracallae: V. longifolia is neared to V. hookeri (Caracallae-Sigmoidotropis) than V. lasiocarpa, the other species of Lasiospron. These results are in agreement with the morphological differences observed between both species, and suggest the possibility of introducing two sections in this group. [ABSTRACT FROM AUTHOR]

This is the first paper of a chemotaxonomic serial studies of the subtribe Phaseolinae in Argentina, wich comprises the generic complex Phaseolus-Vigna-Macroptilium. Chromatographic patterns of 8 species of the genus Macroptilium were determined. Cluster analysis and ordination by principal coordinates analysis were applied to 36 chemical characters ("spots") leading to two distinct groups. These results corroborate the previous taxonomic treatment for this genus based on morphological and palynological studies. Chemical evidence seems to support the sections Macroptilium and Microcochle proposed by Lackey according to Piper, as well as the natural grouping of the species in each of these taxa. [ABSTRACT FROM AUTHOR]

In this contribution, the first references of 3 taxa for the Argentina fern-flora are given: Cheilanthes cucullans Fée from Salta, Blechnum (Lomaridium) kunthianum C. Chr. and Pteris sericea (Fée) Christ from Misiones. Also the taxonomic and morphological references of Pellaea sagittata (Cav.) Link var. sagittata, mencioned in a recent ethnobotanic paper, are given. Each species is illustrated in detail and some palinological data, supporting the apogamy in the type variety of Pellaea sagittata, are briefly discussed. [ABSTRACT FROM AUTHOR]

This paper is a taxonomic revision of the genus Polygonum L in Argentina, with a discussion of the morphological characters of taxonomic importance, a description of the genus and a classification of the 20 species treated in 5 Sections. Polygonum (5 species), Amblygonon Meisner (1 species), Persicaria Meisner (11 species), Echinocaulon Meisner (2 species) and Tiniaria Meisner (1 species). For each species a description, illustrations of interesting characters, geographical distribution, observations and conclusions about the study of the type material, the information about karyology, phenology and probable uses are included. Some species or varieties previously cited for Argentina have been reduced to synonymy (Polygonum meisnerianum var. beyrichianum, P. lanigerum, P. portoricense, P. acuminatum var. microstemon and var. glabrescens, P. punctatum var. aquatile, P. berteroi, P arenastrum, P. persicarioides, P. cordobense and P. rivulare), P. polygaloides, P. spergulariaeforme and P. tenue are taxa erroneously cited for our country, while P. dumetorum is considered of doubtful presence in Argentina. [ABSTRACT FROM AUTHOR]

In the present paper Fischerella major Gomont from Tierra del Fuego, Argentina, is studied. Description and illustrations as well as ecological observations are given. [ABSTRACT FROM AUTHOR]

This paper deals with two genera of Chrysophyceae, Mallomonopsis and Paraphysomonas new for Argentina. Mallomonopsis elliptica var. elliptica, M. parvula nov. comb., M. paxillata, and Paraphysomonas vestita are described and illustrated. [ABSTRACT FROM AUTHOR]

This paper deals with the taxonomic study of soil algae in the surroundings of Buenos Aires (Argentina). Sixty-five species are studied. They belong to sixteen genera of Cyanophyceae distributed in five families and two Orders, and twenty genera of Chlorophyceae distributed in twelve families and six Orders. Among Cyanophyceae the family Oscillatoriaceae is the best represented with six genera and twenty species; among the Chlorophyceae, the Chlorococcaceae with six genera and eight species. The species Phormidium frigidum, Ph. subtruncatum, Ph. rubriterricola, Ph. papy raceum, Hydrocoleum brebissoni, Anabaena fertilissima, Tolypothrix brevis, Plectonema gracillimum (Cyanophyceae) and Chlamydomonas gloeopara, Bracteococcus minor, B. giganteus, Chlorococcum pinguideum, Chlorella fusca var. fusca, Ch. saccharophila var. saccharophila, Ch. zofingensis, Ch. minutissima and Klebsormidium subtile (Chlorophyceae) are new records for Argentina, and so are the genera Coccomyxa, Klebsormidium and Pleurococcus (Chlorophyceae). They are described and the species illustrated. Keys are given for the identification of the orders, families, genera and species. [ABSTRACT FROM AUTHOR]

This paper deals with a taxonomic study of Cyanophyta epiphytic on submerged plants in the following ponds: Chascomús, El Burro, Yalea and Vitel. Keys are given for the identification of the 3 orders, 5 families, 11 enera and 24 species found. The taxa are described and the species illustrated. Eigth species are described for the first time for Argentina. [ABSTRACT FROM AUTHOR]

Thirty species of Inoperculate Discomycetes are described herein from the Nahuel Huapí National Park (Argentina), distributed among thirteen genera belonging to the following families: Hyaloscyphaceae, Dermataceae, Sclerotiniaceae y Helotiaceae. Three of them, namely, Calloria, Sphagnicola and Phaeohelotium are recorded for the first time for Argentina. Of the thirty species found, fifteen are new records for this country. The following new combinations are proposed: Cyathicula chlorosplenioides (Speg.) Gamundí (basinym: Helotium chlorosplenioides Speg.); Rutstroemia megalospora (Speg.) Gam. (bas.: Helotium megalosporum Speg.) y Rutstroemia microsperma (Speg.) Gamundí (bas.: Helotium microspermum Speg.). The paper contains a critical study of type material from Spegazzini's herbarium, and the description of a new species of the same general area: Phaeohelotium castaneum. [ABSTRACT FROM AUTHOR]

In this short paper, the author reports the presence of Notholaena sulphurea (Cav.) J. Sm. in NW and W Argentina (Jujuy and La Rioja Provinces). A key for the Argentine species of that genus, is also given. [ABSTRACT FROM AUTHOR]