Showing papers in "Botanical Journal of the Linnean Society in 1998"

TL;DR: A refined classification and terminology of epicuticular waxes is proposed based on high-resolution SEM analysis of at least 13 000 species, representing all major groups of seed plants, and 23 wax types are classified.

TL;DR: The results strongly support three pairs of families in sister group relationships, as suggested by studies based on other characters: Cabombaceae-Nymphaeaceae, Saururaceae-Piperaceae, and Lactoridaceae-Aristolochi Families, and Hydnoraceae-Rafflesiaceae to some extent.

TL;DR: The dragon tree group is postulate that this group has a Tethyan origin, a hypothesis supported by fossil and palaeoclimatic data, and thus parallels the distribution and dispersal pattern of other taxonomic groups.

TL;DR: The Sainsbury Orchid Conservation Project, based in the Micropropagation Unit of the Royal Botanic Gardens, Kew, has worked for many years with English Nature, and the Species Recovery Programme in particular, in raising plants of the lady's slipper orchid for re-establishment.

TL;DR: The overall mean percentage of fruiting for over 3500 flowers observed in eight Estonian populations of a self-compatible clonal orchidCypripedium calceolus over 11 years was 10.5%.

TL;DR: Investigating the biology of the early life history and size of seed/seedling populations relative to the number of plants that eventually emerge above ground in orchid seeds finds considerable variation in germination strategies, patterns of seedling development and establishment, substrate requirements, and levels of specificity with the fungi.

TL;DR: There were some variations in the proportions of sugar throughout both the flower lifespan and the flowering season, and the sources of nectar variability seem to be linked with both the female function (nectar resorption, nectar cessation) and the male one (early and comparatively large nectar availability).

TL;DR: The findings suggest that cryptospore permanent dyads were produced by rhyniophytoid plants of small stature, and the production of dyads by a plant with a bifurcating sporophytic axis is evidence against affinity with extant bryophytes.

TL;DR: The field survey suggests that in dioecious plants sex determination and expression are usually effectively maintained, and the very slight deviations from the 1:1 sex ratio and from the distinct male and female morphs suggest that sexual dimorphism in diodic plants is usually stabile.

TL;DR: Chromosome counts are reported for nine species of Centaureafrom Turkey and a relationship between the reproductive behaviour (allogamy or autogamy) and the occurrence of dysploidy is suggested.

TL;DR: The results of a 7 year demographic study of a population of C. viride in The Netherlands are presented: there is a high recruitment almost every year resulting in a vigorous age structure, and the studied population is likely to be in a healthy state.

TL;DR: Morphology and isoenzyme patterns support the taxonomic delimitation of two subspecies of Viola rupestris and ssp.relicta in the Nordic area, and three different, geographically distinctly defined genotypes are revealed.

TL;DR: Parsimony analysis of morphological data was used to demonstrate the existence of five groups in Thamnochortus, suggesting that geographical differentiation within the genus has followed climatic patterns, and suggesting that some of the speciation may be a consequence of climatic change in southern Africa.

TL;DR: New information is presented on astelioid anatomy, together with a review of other systematic characters, in the context of recent evidence from rbc L nucleotide sequences thatAstelioids are related to orchids, and that astelIOids and orchid form a clade that is sister to all other asparagoid taxa.

TL;DR: According to the phylogenetic analysis, Mormolyca ringens is consistently nested within the cladistic structure of Maxillaria, which likely is paraphyletic if Mormetic Ringens is recognized as generically distinct.

TL;DR: It is hypothesized that drought and high temperatures in the summer reduce leaf area and cause premature senescence and the death of leaves, with the result that not enough carbohydrates are stored to enable plants to support or initiate inflorescences the following year.

TL;DR: The ultrastructure of the labellar epidermis of 13 species of Maxillaria and one hybrid was examined using low-vacuum scanning electron microscopy (SEM), and preliminary results suggest that labellar features may provide additional taxonomic characters allowing determination of intrageneric affinities.

TL;DR: Diversity patterns across three taxonomic levels may reflect the relative historical positions of the two continents, neighbouring land masses, differential speciation/extinction rates, and switches in dominance levels associated with climate change (including glaciation), as well as reproductive/dispersal mechanisms of the three plant classes.

TL;DR: It is concluded that flower warming at low ambient temperatures may mediate flower opening in Crocus and allow pollination, and may stimulate pollen germination and the fertilization process.

TL;DR: It is concluded that the studied tepal characters can be useful in improving the classification of tribes Persicarieae and Polygoneae, and give additional support at the infrageneric level.

TL;DR: A refined classification and terminology of epicuticular waxes is proposed based on high-resolution SEM analysis of at least 13 000 species, representing all major groups of seed plants, and 23 wax types are classified.

TL;DR: The anatomy of colleters was examined by light and scanning electron microscopy in 25 species of Turnera and nine species of Piriqueta, finding the first record of sessile, lachrymiform and trochleariform colleters.

TL;DR: The number and proportion of the emergent plants which flower each year has increased considerably since 1986, and the age structure has since become dominated by younger plants, reflecting the increased rate of recruitment and lack of a corresponding increase in mortality.

TL;DR: The short-lived character of many Liparis individuals and the quite rapid population turnover suggests that effective conservation management must provide conditions suitable for recruitment of new individuals as well as the maintenance of established plants, but the character of suitable regeneration niches is not well understood.

TL;DR: The findings suggest that flower age at pollination must be considered when interpreting similar studies in the Orchidaceae, and an influence of flower position in the inflorescence on self-compatibility and on the production of the easy-to-germinate seed class is observed.

TL;DR: Embryology of Lauraceae, hitherto poorly known, was investigated on the basis of 35 species from 23 genera to contribute to a better understanding of familial and generic relationships and to properly be incorporated in a future suprageneric classification.

TL;DR: It was shown that spores remain viable after passing through the gut of earthworms and that spore banks from even small soil samples revealed genetic diversity and could lead to a large number of genetically distinct sporophytes.

TL;DR: It is shown that a substantial number of Ophrys sphegodesplants emerge above ground and re-enter the below ground phase before the census date, suggesting that reliance on annual census records alone may result in the size of the population being underestimated and incorrect life-histories being ascribed to individual plants.

TL;DR: When attributes of population flux are analysed in relation to floristic composition, one significant trend to emerge is that the appearance of new genets is most prevalent in successionally young slacks.