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| Rossi,Ana Aparecida B.; Oliveira,Luiz Orlando de; Vieira,Milene F.. |
| Psychotria ipecacuanha is a perennial, medicinal herb that grows in clusters in the understory of humid, shady areas of the Atlantic Rain Forest of southeastern Brazil. The present study characterized the variation in floral traits among 35 clusters from three natural populations of this plant species. Field observations showed that the clusters are isomorphic, that is, a given cluster will either set long-styled or short-styled flowers. Stigmas and anthers are reciprocally placed in each morph, a dimorphism characteristic of distyly. The populations are isoplethic, that is, a given population exhibits an equilibrium 1:1 ratio of floral morphs. Morphometric analyses revealed that anther length, stigma length, corolla diameter, and pollen grain diameter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Distyly; Floral morphology; Ipecac; Medicinal plants; Psychotria ipecacuanha. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000200009 |
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| Virillo,Carolina Bernucci; Ramos,Flavio Nunes; Castro,Cibele Cardoso de; Semir,João. |
| (Floral biology and breeding system oi Psychotria tenuinervis Muell. Arg. (Rubiaceae) in the Atlantic rain forest, SE Brazil). The aim of this study was to investigate pollination biology, floral morphometry, morph ratio and breeding system oiPsychotria tenuinervis in an area of Atlantic rain forest in southeastern Brazil. Pollination biology was studied based on focal observations and the breeding system was determined using controlled crosses; data on flower production and floral morphometry were compared between the two floral morphs. Flower production by the two floral morphs was similar, with flowers being reciprocally herkogamous, diurnal and pollinated at similar frequencies, mainly by medium-sized bees. Corolla length and diameter, as well as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic forest; Distyly; Flower; Herkogamy; Pollination. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000400012 |
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| BARROS,MARILUZA GRANJA e. |
| Foram investigadas a biologia reprodutiva e a polinização de Erythroxylum campestre St. Hil., E. suberosum St. Hil. e E. tortuosum Mart., ocorrentes na Fazenda Água Limpa, Brasília, DF. Estas espécies são simpátricas, comumente encontradas em cerrados abertos e florescem em média quatro meses por ano. As três espécies são distílicas, isto é, apresentam flores com estiletes longos (longistiladas) e flores com estiletes curtos (brevistiladas), ambas com estames em posicionamentos correspondentes. As flores são similares, pequenas, suavemente perfumadas, de cor creme claro, diurnas, produtoras de néctar (concentração média de sacarose de 20,2%) e duram um dia. Os testes de polinização artificial revelaram que E. suberosum e E. tortuosum são auto-incompatíveis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erythroxylum; Sympatry; Distyly; Incompatibility. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041998000200008 |
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