摘要:

In the generaSaxifraga, Saxifragodes, Saxifragella, SaxifragopsisandZahlbrucknerafoliar crystals were found to be present only inSaxifragodesandSaxifragasectionsMicranthesandIrregulares. The crystals occur as stellate druses, except inSaxifraga nipponicaandS. cortusifolia(sectionIrregulares) where they occur as single needles. This finding indicates a close relationship between these two sections ofSaxifraga. The monotypicSaxifragodes, from southern South America, does not appear to be related to Andean species ofSaxifraga, which lack crystals, but rather to species ofSaxifragasectionMicranthesin North America. The taxonomic affinities of five species in sectionMicranthesthat lack crystals are discussed.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00935.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

In the system of classification sensu Cronquist, the division between the two subclasses Dilleniidae and Rosidae relies on only a few characters. The major distinguishing character is the occurrence of centripetal or centrifugal sequence of stamen development. We question not only the application and the value of this character, but also the maintenance of the Rosidae and Dilleniidae as separately derived natural taxa, because of the lack of solid distinguishing criteria. We have studied the staminal characters in the 192 families of the Dilleniidae and the Rosidae, using Dahlgren's classification diagram.The study focussed on the following androecial characters: 1) polyandry; i.e. spiral polyandry, complex polyandry (viz. centrifugal, centripetal and lateral polyandry) and cyclic polyandry 2) diplostemony and obdiplostemony 3) haplostemony and obhaplostemony.In our proposal only two characters are maintained, namely oligomery (diplostemony s.l.) and polymery (true polyandry s.l.), both having a number of character states. Polyandry, as it has been described up to now, is not to be regarded as homologous in all Magnoliophytina. Both characters correspond to two different lines within the Magnoliatae. In addition, the division between the Dilleniidae and Rosidae sensu Cronquist is no longer tenable.Finally, a number of modifications of Dahlgren's diagram are suggested and a division of the Magnoliophytina in a polymerous group and an oligomerous group is proposed. The Dilleniidae‐Rosidae complex is included in the oligomerous grou

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00936.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00937.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Hagenbachia, which until recently was included in Haemodoraceae, belongs in Asphodeleae in Liliaceae sensu lato or Anthericaceae sensu stricto.Hagenbachiaand its putative relativesEcheandia, Anthericum, andChlorophytumare characterized by anatropous ovules, curved or angled embryos, and nonarillate seeds, which indicate a position in Anthericaceae, as well as a black, colliculose seed coat.Hagenbachiaincludes five species of Central and South America; one,H. columbiana, is described here. The available data suggest the species are ecologically as well as geographically isolated. There are two broad leaved species. One is endemic to the lowlands of eastern Brazil and the second is found at middle elevations in Costa Rica and Panama and on the eastern slope of the Andes in Ecuador. Of the three narrow leaved species, one is endemic to the Cordillera Central in Columbia, a second is endemic to eastern Paraguay and southeastern Bolivia and the third occurs from eastern Bolivia northeast to east‐central Brazi

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00938.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Five new species ofWahlenbergiaare described and illustrated:W. tetramerafrom the high Drakensberg in Natal,W. petraeafrom Burundi, andW. marunguensis, W. polyphyllaandW. malaisseifrom Zaire.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00939.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00940.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Xylocalyx carteriaesp. nov. from central Somalia is described and illustrated. The hygrochasy in this species as well as inXylocalyxin general is pointed out.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00941.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00942.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

The genusSiamosia(Amaranthaceae) is established and the type speciesS. thailandicais described and illustrated. The pollen morphology is compared with the related generaChamissoa, Charpentiera, HerbstiaandIndobanalia.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00943.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Three new species,Hiptage calcicola, H. gracilis, andH. monopteryxare described. A key to the species ofHiptagefound in Thailand is provided.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00944.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY