| Titre : | Botanical Journal of the Linnean Society 126(1-2) - 1998-01-01 |
| Type de document : | Bulletin |
| Paru le : | 01/01/1998 |
Dépouillements
Article
Stephen Waite, Auteur ;
Lynne Farrell, Auteur
In Britain, where it reaches the north-westerly limit of its European distribution, Orchis militaris L. is extremely rare. Well-established and persistent populations of O. militaris are known to exist at only two sites. The largest extant popul[...]
Article
Nicola Patricia Sanger, Auteur ;
Stephen Waite, Auteur
Ophrys sphegodes is a rare species in the United Kingdom. The largest extant population of the species, at Castle Hill National Nature Reserve in Sussex, has been monitored each year since 1975. At each annual census, which is conducted during t[...]
Article
B. D. Wheeler, Auteur ;
P. W. Lambley, Auteur ;
J. Geeson, Auteur
The fenland form of Liparis loeselii is currently known from only three sites in eastern England, having been lost from about 30 former localities since the start of the nineteenth century. The reason for its loss is sometimes uncertain, but in [...]
Article
T. C. E. Wells, Auteur ;
P. Rothery, Auteur ;
Ruth Cox, Auteur ;
S. Bamford, Auteur
Information taken from two long-term demographic studies on Orchis morio L. and Herminium monorchis (L.) R.Br, is used to explore some of the factors which influence flowering. The proportion of plants which flowered each year varied considerabl[...]
Article
Hanne N. Rasmussen, Auteur ;
Dennis F. Whigham, Auteur
Orchid seeds are minute and the first seedling stages of terrestrial species are underground, so there is little knowledge about the biology of the early life history and the size of seed/seedling populations relative to the number of plants tha[...]
Article
Margaret M. Ramsay, Auteur ;
Joyce Stewart, Auteur
The Sainsbury Orchid Conservation Project (SOCP), 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 lad[...]
Article
M. J. Hutchings, Auteur ;
A. Mendoza, Auteur ;
W. Havers, Auteur
Orchis militaris L. underwent a catastrophic decline in range and plant numbers in the British Isles around the end of the nineteenth century, and was long thought to be nationally extinct. A small number of colonies have been discovered since t[...]
Article
Phillip Cribb, Auteur ;
Marianne Syrylak Sandison, Auteur
The conservation of few plants produces such an emotive response as that of hardy slipper orchids of the genus Cypripedium. The genus, comprising 45 species and two varieties, is holarctic in distribution with the centre of diversity in China. M[...]
Article
Demographic techniques have been employed to study populations of the rare orchid Liparis loeselii var. ovata across a range of dune slack habitats at a South Wales site. The study has shown that very large numbers of shoots (>300) may occur wit[...]
Article
M. P. Gillman, Auteur ;
M. E. Dodd, Auteur
Orchid population size has long been believed to be highly variable in time and space. Here we present the first quantitative assessment of the variability of orchid population sizes and compare them with plant and animal population data from th[...]
Article
The overall mean percentage of fruiting for over 3500 flowers observed in eight Estonian populations of a self-compatible clonal orchid Cypripedium calceolus over 11 years was 10.5%. The larger clones set relatively fewer fruits, otherwise the g[...]
Article
M.H.S. Light, Auteur ;
M. MacCONAILL, Auteur
One of the challenges facing orchid conservationists is to get a better understanding of seed parent fecundity. This can be especially laborious for orchids whose seed is difficult to germinate. Mature seeds of Cyripedium calceolus var. pubescen[...]
Article
A population of Himantoglossum hircinum (L.) Spreng. (lizard orchid) has been monitored since the 1940s at a site in the south-east of Great Britain. A map of the site showing the number and position of flowering plants has been produced in most[...]
Article
J. H. Willems, Auteur ;
C. Melser, Auteur
Coeloglossum viride (L.) Hartm. has a worldwide distribution in the Northern hemisphere where it can be found in a broad range of habitats; it is not, at present, threatened with extinction. However, in several European countries there has been [...]
