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| Vrijdaghs, A.; Goetghebeur, P.; Smets, E.; Muasya, A.. |
| Background and Aims In 1976 the monotypic genus Hellmuthia was placed in the Hypolytreae s.l., but was subsequently ascribed to the Mapanioideae, tribe Chrysitricheae, mainly because of the presence in Hellmuthia of two lateral, mapanioid-like floral scales with ciliated keels, the anatomy of the nutlet, the embryo and the inflorescence. Recently, based on cladistic analyses and supported by pollen ontogenetic evidence, Hellmuthia was transferred to a Cyperaceae, tribe Cypereae, clade mainly consisting of Ficinia and Isolepis. In this study, the floral ontogeny in Hellmuthia was investigated and compared with the floral ontogeny in Paramapania, with special attention for the floral scales. Methods Freshly collected inflorescences of Hellmuthia... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Floral scales; Paramapania; Floral ontogeny; Cyperaceae; Hellmuthia; SEM; Homology. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/407327 |
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| Huygh, W.; Schouppe, D.; Larridon, I.; Simpson, D.A.; Goetghebeur, P.. |
| Kyllinga cataphyllata, a new species of Cyperaceae from the highlands of Western and Central Africa, is described and illustrated. This new species is easy recognized by the ascending rhizome densely covered by large cataphylls. The head-like inflorescence consisting of a single spike with spikelets made up of two to three glumes and only one flower, and the glumes characterized by a spinulose greenish keel. It is closely related to K. brevifolia, but differs in having conspicuous cataphylls, glumes with a strongly toothed keel and an asymmetrical pedicel to the nutlet. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Africa; Cyperaceae; Highland flora; Kyllinga. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/525316 |
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| Goetghebeur, P.. |
| The new species Cyperus macropachycephalus, known only from Chambri Lake in the Lower Sepik area (Papua New Guinea) is described and illustrated. Its ovary is dimerous and dorsiventrally compressed, much flattened, or more rarely trimerous, and then compressed subtrigonous. A close relative could be Cyperus pachycephalus Kem, but the wider affinities are rather obscure. |
| Tipo: Article / Letter to the editor |
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| Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/524838 |
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| Vrijdaghs, A.; Goetghebeur, P.; Smets, E.; Caris, P.. |
| The inflorescence unit of Schoenus nigricans and S. ferrugineus consists of a zigzag axis and distichously arranged bracts, each of which may or may not subtend a bisexual flower. Each flower seems to terminate a lateral axis. These features have led to a controversy about the nature of the inflorescence unit, particularly whether it is monopodial or sympodial. It was often seen as a pseudospikelet composed of a succession of lateral axes, each subtended by the prophyll of the previous axis, as in a rhipidium. Many authors, however, consider the inflorescence units of all Cyperaceae to be indeterminate, racemose, actual spikelets. In our study, we present new SEM observations on the floral ontogeny of S. nigricans, corroborating a monopodial interpretation... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Floral ontogeny; Monopodial; Rhipidium; Schoenus nigricans; SEM; Spikelet; 42.48. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/414074 |
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| Simpson, D.A.; Muthama Muasya, A.; Alves, M.V.; Bruhl, J.J.; Dhooge, S.; Chase, M.W.; Furness, C.A.; Ghamkhar, K.; Goetghebeur, P.; Hodkinson, T.D.; Marchant, A.D.; Reznicek, A.A.; Nieuwborg, R.; Roalson, E.H.; Smets, E.; Starr, J.R.; Thomas, W.W.; Wilson, K.L.; Zhang, X.. |
| Since the Monocots II meeting in 1998, significant new data have been published that enhance our systematic knowledge of Cyperaceae. Phylogenetic studies in the family have also progressed steadily. For this study, a parsimony analysis was carried out using all rbcL sequences currently available for Cyperaceae, including data for two new genera. One of the four subfamilies (Caricoideae) and seven of the 14 tribes (Bisboeckelereae, Cariceae, Cryptangieae, Dulichieae, Eleocharideae, Sclerieae, Trilepideae) are monophyletic. Subfamily Mapanioideae and tribe Chrysitricheae are monophyletic if, as the evidence suggests, Hellmuthia is considered a member of Cypereae. Some other features of our analysis include: well-supported Trilepideae and... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cyperaceae; Monocotyledons; Phylogeny; RbcL; Sequence; 42.48. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/414071 |
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| Vrijdaghs, H.; Goetghebeur, P.; Muasya, A.M.; Caris, P.; Smets, E.. |
| ! Background and Aims The generic delimitations of Ficinia and Isolepis, sister genera in the Cypereae, are blurred. Typical Ficinia flowers have a lobed gynophore, which envelops the base of the nutlet, whereas in Isolepis the character is considered to be absent. Some former species of Isolepis, lacking the gynophore, were recently included in Ficinia. The floral ontogeny of representative taxa in Ficinia and Isolepis were investigated with the aim of evaluating the origin and nature of the gynophore in the Cypereae. ! Methods The spikelet and floral ontogeny in inflorescences collected in the field was investigated using scanning electron microscopy (SEM) and light microscopy (LM). ! Key Results SEM images of Isolepis setacea and I. antarctica, Ficinia... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ficinia; Floral ontogeny; Gynophore; Isolepis; Scanning electron microscopy. |
| Ano: 2005 |
URL: http://www.repository.naturalis.nl/record/407286 |
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