|
|
|
|
|
| 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 |
| |
|
|
| Groeninckx, I.; Vrijdaghs, A.; Huysmans, S.; Smets, E.; Dessein, S.. |
| Background and Aims Members of Rubiaceae are generally characterized by an inferior ovary. However, Mitrasacmopsis is cited in the literature as having a semi-inferior to superior ovary. It has previously been hypothesized that the gynoecial development of Rubiaceae with semi-inferior to superior ovaries takes place in the same way as in Gaertnera, one of the most commonly cited rubiaceous genera with a superior ovary. To test this hypothesis, a floral ontogenetic study of Mitrasacmopsis was carried out with special attention paid to the gynoecial development. Methods Floral ontogeny and anatomy of Mitrasacmopsis were examined using scanning electron and light microscopy. Key Results At an early developmental stage, a concavity becomes visible in the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Mitrasacmopsis quadrivalvis; Gaertnera; Floral ontogeny; 42.48. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/422222 |
| |
|
| |
|
|
| 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 |
| |
|
|
| Caris, P.; Smets, E.; De Coster, K.; Ronse De Craene, L.. |
| The floral ontogeny of the Spurge olive (Cneorum tricoccon L.) is studied by means of scanning electron microscopic observations. Special attention is paid to the sequence of initiation of the floral parts, the occurrence of septal cavities, and the development of the nectariferous tissue. The nectary disc arises as a receptacular outgrowth below the ovary and independently from stamen development. By the extensive growth of this voluminous androgynophore, stamen filaments become enclosed by nectary tissue and as a result, they are seated in pits between the lobes of the disc. Between ovary and style, three lobes are present, which are covered with stomata – their function is unknown. The significance of the unusual trimery of the flower is discussed.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Androgynophore; Cneoraceae; Cneorum tricoccon L.; Floral ontogeny; Nectary; Rutaceae; Spurge olive. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/407345 |
| |
|
| |
|
|
| 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 |
| |
|
|
|
