ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02286.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Review is presented of some of the recent computer‐based projects in botany, including: ILDIS (the International Legume Database and Information Service), ESFEDS (European Science Foundation‐European Documentation System),Flora Europaea,TDWG (Taxonomic Databases Working Group), Species Plantarum Project, ‘Names in Current Use’ and BSBI (Botanical Society of the British Isles) database

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02287.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

The development of the Hartekamp, George Clifford's estate, into one of the finest private Dutch botanical gardens was strongly influenced by the Hortus Botanicus of Leiden and its directors Boerhaave and Van Royen. Boerhaave'sIndex alter plantarumwas used as the taxonomic framework for Clifford's herbarium until Linnaeus rearranged it.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02288.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

This study presents data on the reproductive characteristics ofNerium oleander,an evergreen, sclerophyllous shrub inhabiting the banks of temporary streams in all countries around the Mediterranean seaboard. Two southern Spanish populations (El Garrobo and Grazalema) were selected to investigate flowering, dispersal and seed germination phenologies, together with morphological and functional traits of flowers, fruits and seeds. Observations on pollinator visitation, fruit set, and seedling survival were also carried out.Plants produce massive flower displays of showy, tubular flowers void of nectar that rely on insect cheating for pollination. Hand‐pollinations and seed germination tests demonstrated full self‐compatibility. Automatic selfing is prevented by spatial separation of stigma and anthers, and pollinators are thus necessary for reproduction. Low pollinator visitation rates are the rule, as indicated by the fact that observations spread over 2 years yielded only eight insect records. Percentage fruit set of open‐pollinated flowers was found to be extremely low (0.1–4.9%), while hand‐pollination increased fruiting levels to 34–50%. Direct and indirect evidence point to consistently pollen‐limited reproduction in this species. If a large number of flowers within any inflorescence are pollinated artificially, however, resource limitations operate and pods from ovaries pollinated late in the season are aborted. On average, the maximum of ovaries developing into fruit within any inflorescence is 4. It is suggested that, in this nectarless species, about 80% of total are ‘excess’ flowers which contribute to increase pollinator attraction.Nerium oleanderpollen is aggregated into a sticky substance, which allows the fertilization of many ovules after a single, probably rare, pollination event. Fruits are many seeded follicles (181 seeds per fruit on average), so that individual plants often liberate thousands of seeds in spite of the low percent fruit set. The hairy, water‐dispersed seeds are released during the rainiest season in the year, and germination follows rapidly. All seedlings tracked died before completing 1 year of life, mostly because of desiccation during the first summer drought.Pollination by deceit in this Mediterranean species is discussed in terms of phylogenetic constraints within the mainly tropical

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02289.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

TheLuciliagroup (Asteraceae, Inuleae‐Gnaphaliinae)sensuMerxmiillerel al.is revisited and its phytogeny analysed by means of a computerized parsimony program (Hennig86). Cladograms and strict consensus trees are presented and discussed. A sequential model of the vicariance biogeography of theLuciliagroup is presented and its implications on the historical biogeography of South America is discussed. The following genera are recognized as belonging to the group:Belloa, Berroa, Chevreulia, Cuatrecasasiella(=Luciliopsisauct.),Facelis, JalcophilaandLucilia.Also belonging to theLuciliagroup are the two generaGamochaetopsisandLuciliocline.A key is given to the nine recognized genera, each of which is described here with brief descriptions and lists of recognized specie

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1991.tb02290.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY