Rodrigo Schütz Rodrigues

O gênero Senna (Leguminosae, Caesalpinioideae) no Rio Grande do Sul, Brasil

This paper presents a taxonomic study of the species of the genus Senna occurring in Rio Grande do Sul State, Southern Brazil. Nineteen species were found and the occurences of Senna aphylla (Cav.) H.S. Irwin & Barneby, S. araucarietorum H.S. Irwin & Barneby, S. pendula (Willd.) H.S. Irwin & Barneby, S. scabriuscula (Vogel) H.S. Irwin & Barneby and S. spectabilis (DC.) H.S. Irwin & Barneby are recorded for the first time in Rio Grande do Sul. Analitical key, species descriptions and illustrations are presented. Additional informations are provided concerning geographic distribution, habitats, common names and economic uses.

Diversidade de Leguminosae em uma área de savana do estado de Roraima, Brasil

Leguminosae is the most diverse family in the savannas of Roraima, which are the largest savanna areas in the Brazilian Amazon. This paper presents a floristic survey and an analysis of the geographic distribution patterns of Leguminosae taxa in a savanna area at Boa Vista, Roraima (02o52´07´´N; 60o43´03´´W). The survey identified 80 taxa belonging to 38 genera. Six taxa are new records for the flora of Roraima. The best-represented genera were Aeschynomene and Chamaecrista, both with seven species each. Leguminosae-Papilionoideae was the most diverse subfamily based on the number of genera (24) and infrageneric taxa (53). The phytogeographical analysis revealed predominance of taxa with a Neotropical distribution. The savanna site analyzed represents a legume diverse area, because it concentrates 87% of legume diversity referred for the savannas of Roraima.

Morfologia de plântulas de cinco leguminosas genistóides arbóreas do Brasil (Leguminosae-Papilionoideae)

This work aims to describe, illustrate and compare the seedling morphology of five tree species of the genera Bowdichia, Cyclolobium, Diplotropis, Ormosia, and Poecilanthe, which belong to the genistoid clade (Leguminosae Papilionoideae). Phanero-epigeal-foliaceous seedlings are found in Bowdichia virgilioides Kunth, Cyclolobium brasiliense Benth. has phanero-epigeal-reserve seedlings, while Ormosia arborea (Vell.) Harms, Diplotropis martiusii Benth., and Poecilanthe parviflora Benth. possess crypto-hypogeal-reserve seedlings. Some other relevant seedling morphological characters are discussed and compared with those of previously studied species in these genera.

Systematic relevance of seedling morphology in Acosmium , Guianodendron , and Leptolobium (Leguminosae, Papilionoideae)

Morphological and taxonomic studies have proposed changing the circumscription of Acosmium, with the recognition of two additional genera, Leptolobium and Guianodendron. A study on seedling morphology of all accepted species of Acosmium s.str., five species of Leptolobium, and Guianodendron praeclarum is presented, aiming to evaluate the systematic value of these characters. Guianodendron has crypto-hypogeal reserve seedlings, while Acosmium and Leptolobium have phanero-epigeal seedlings with foliaceous cotyledons. The latter two genera are distinguishable from each other mainly by hypocotyl shape, ratio of hypocotyl length to epicotyl length, nyctinasty of leaflets and cotyledons, shape and venation of cotyledons, stipule and leaflet morphology, presence or absence of intercotyledonary glands, and presence of glands on other vegetative parts. In conclusion, seedling morphology data provide relevant systematic characters that support the proposed changes in the generic delimitation of Acosmium.

Morfologia de plântulas no clado Vatairea (Leguminosae, Papilionoideae)

(Morfologia de plântulas no clado Vatairea (Leguminosae, Papilionoideae)) Ο clado Vatairea sensu Mansano et al. (Leguminosae, Papilionoideae) e constituido pelos generos Luetzelburgia, Sweetia, Vatairea e Vataireopsis, dentre os quais informacoes sobre plântulas sâo restritas a Vatairea e Vataireopsis. Neste trabalho, plântulas de Luetzelburgia guaissara Toledo e Sweetia fruticosa Spreng. sâo descritas e ilustradas. Luetzelburgia guaissara possui plântulas fanero-epigeo-armazenadoras, enquanto que Sweetia fruticosa apresenta plântulas cripto-hipogeo-armazenadoras. E apresentada uma breve revisâo da morfologia de plântulas dos representantes do clado Vatairea, bem como uma chave de plântulas para a identificacâo de seus generos. A variacâo dos tipos morfologicos e de alguns caracteres como numero de foliolos, presenca de catafilos, projecâo basal no colo e tipo de nictinastia foliolar apresenta relevância sistemâtica para distincâo de generos neste clado. Palavras-chave: Clado Vatairea, Leguminosae, Papilionoideae, morfologia, plântula, Brasil. Abstract

Guianodendron, a New Genus of Leguminosae (Papilionoideae) from South America

ABSTRACT The new genus Guianodendron Schütz Rodrigues & A. M. G. Azevedo (Leguminosae, Papilionoideae, Sophoreae) from Guyana and the Brazilian state of Amazonas is described and illustrated, and a new combination, Guianodendron praeclarum (Sandwith) Schütz Rodrigues & A. M. G. Azevedo, is made. The genus is characterized by a radial corolla with auriculate petals; five stamens; reduced ovule number; a straight hypanthium; indehiscent, flattened, and sutural-winged fruits; persistent bracts and bracteoles; leaflets with a papillate abaxial epidermis; and ovate to ovate-elliptic markedly striate stipules.

Morfologia de plântulas das espécies de Rhynchosia (Leguminosae, Papilionoideae) de Roraima, Brasil

This paper aims to describe, illustrate and compare the seedling morphology of the four species of Rhynchosia (Leguminosae, Papilionoideae) that occur in Roraima, Brazil. The studied species, R. phaseoloides (SW.) DC., R. melanocarpa Grear, R. minima (L.) DC., and R. schomburgkii Benth., possess crypto-hypogeal-reserve seedlings, eophylls at the first node that are 1-foliolate and opposite, and double and free stipules. The results show that morphological diversity found among seedlings of the studied species can be used to identify them at the specific level. Rhynchosia species are distinguishable from each other mainly by blade morphology and stipule length at the first eophyll node, as well as by the number of leaflets, shape and venation of the stipules of subsequent eophylls. This work also discusses the morphological variation found in Rhynchosia, and elucidates disparate data in the literature on seedlings of R. minima and R. phaseoloides.

Novas ocorrências de Rapateaceae para o Brasil

This paper presents five new additions of Rapateaceae to the Brazilian flora from Monte Caburai, a low-altitude tepui in Roraima state. One species of Epidryos Maguire, another of Rapatea Aubl., and three species of Stegolepis Klotzsch ex Korn were recorded. Epidryos is cited for the first time for the Brazilian flora. Brief descriptions, illustrations, geographic distribution and habitat data as well as comments on taxonomic affinities of the species are presented.

Taxonomic relevance of seed and seedling morphology in two Amazonian species of Entada (Leguminosae)

We carried out a comparative morphological study to evaluate the taxonomic value of seed and seedling traits of Entada polystachya and E. simplicata (Leguminosae, Mimosoideae, Mimoseae). Seeds of both species were collected from wild populations in Roraima State, Brazil. Our results show consistent quantitative and qualitative differences between these species regarding their seeds and seedlings. Testa fracture lines, funiculus impression, lens characters, radicle shape and length, and cotyledon lobes length, seedling morphology group, number of pinnae at first node, and hypocotyl length permit a straightforward distinction of E. polystachya from E. simplicata, supporting a recent treatment of the latter taxon as a distinct species, endemic to Roraima State, northern Amazonia, Brazil.

Revisão taxonômica de Leptolobium (Papilionoideae, Leguminosae)

This revision of Leptolobium Vogel includes an identification key, descriptions, illustrations, and distribution maps for the taxa. Leptolobium comprises 12 species, and is characterized by its arboreal or shrubby habit, flowers with white, actinomorphic or slightly zygomorphic corollas, 10 free stamens, a stipitate ovary with many ovules, indehiscent (samara-like or nut-like) fruits, compressed seeds, and a bulbose hypocotyl-radicle axis. Leptolobium is a neotropical genus that occurs from Mexico to northern Argentina. Eleven species are found in Brazil, seven of which are endemic to the country. The lectotype of Sweetia glazioviana Harms is designated in this paper. In addition, information about uses, common names, geographical distribution, and habitats are provided.