摘要:

A general description of leaf anatomy in Iridaceae is given, and the importance of leaf anatomical characters for the systematics of the family is assessed by means of a cladistic analysis utilizing characters from morphology, anatomy and biochemisty. Although there is high homoplasy amongst both morphological and anatomical characters, leaf anatomy provides some significant data for Iridaceae systematics, especially at the tribal level.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01920.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

A new species ofFestuca (Festuca rivas‐martineziide la Fuente&Ortúñez) is described from the Sierra de Ayllón, Sierra de Guadarrama, Sierra de Gredos and associated chains (northcentral Spain: provinces of Avila, Guadalajara, Madrid and Segovia. Some morphological, anatomical and cytological characters of the taxon are prese

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01921.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Leaf anatomy of 25 species in 15 genera of Caladeniinae (Diurideae, Orchidaceae), excludingCaladenia,was investigated to determine diagnostic characters to be used in forthcoming, broad‐based cladistic analyses of the subtribe and to assess interspecific and intergeneric relationshipS. Of the characters examined, those that show the most variation among the study taxa are presence and types of trichomes, cuticular sculpturing, anticlinal walls of epidermal cells, heterogeneity of chlorenchyma, distribution and length: width ratios of stomata. Anatomical evidence supports the generic concept ofLeptocerasLindley but contradicts that ofDrakonorchisHopper&A.P. Brown.Paracaleanais not sufficiently distinct fromCaleanato warrant generic status.Lyperanthus serratusandL.suaveolensare hyperstomatic, a rare condition in Orchidaceae. On the basis of these and other characters,Lyperanthus,as currently circumscribed, is polyphyletic. From leaf structure Caladeniinae as now conceived is polyphyletic and comprises seven groups: (1)Caladenia, Leptoceras, Elythranthera, Eriochilus, Glossodia, Aporostylis;(2)Adenochilus, Rimacola;(3)Arthrochilus, Chiloglottis, Spiculaea, Leporella;(4)Caleana(includingParacaleana);(5)Bumettia;(6)Lyperanthus suaveolensandL.serratus;(7)Lyperanthus nigrican

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01922.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Corolla ontogeny has been investigated in 33 species of 23 genera of Acanthaceae. These data are supported by less informative descriptions of mature aestivation patterns in 96 species of 34 genera. Five distinct aestivation patterns are described and illustrated: left contort, quincuncial, ascending cochlear, descending cochlear, and open. Corolla ontogeny alone provides no evidence for distinguishing the relative plesiomorphy and apomorphy of different aestivation patterns. These data undermine previous higher level classifications of Acanthaceae.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01923.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Changes in the structural features of cell populations in the pedicelof Lemboglossum bictoniense(Batemanex.Lindley) Halbinger were examined by means of light microscopy in relation to resupination, a twisting of the pedicel through 180oprior to flower opening. Serial sections in transverse and longitudinal planes were taken from pre‐resupinate and fully resupinate pedicels of flowers from a single inflorescence, and comparisons made between the tissues. The pedicel is a prismatic cylinder flattened on three sides, producing three distinct ribS. Each rib contains one central vascular bundle enclosed by cortical parenchyma. Intervening cortical parenchyma forms flanks external to a central core of three vascular bundles, each of which is split into three distinct traces at this level. Resupination is accompanied by axial and radial expansion of cortical parenchyma. Specialized raphide‐bearing cells in the cortex expand axially doubling their length in the ground parenchyma. These raphide cells are localized in the rib cortex, and their expansion is reflected in greater elongation of the ribs relative to flank areas. The extra rib length is accommodated by a lateral displacement (twisting) of the ribs around the central axis of the pedicel. Tissue distortion is reduced by cell division, expansion of intercellular spaces and a radial contraction of pith parenchyma. Raphide cell elongation could be a contributing factor in pedicel twisting. The direction of resupination may be controlled by the organization of these cells into arcs on one or other side of the rib vascular bun

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01924.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

The subtribe Astephaninae (tribe Asclepiadeae, Asclepiadaceae) is recircumscribed to contain 11 genera:Astephanus, Blyttia, Diplostigma, Goydera, Aiicroloma, Oncinema, Pentatropis, Pteurosteima, Rhyncharrhena, Schizostephanus,andTylophoropsis.Following a character analysis, phylogeny was analysed by means of a computerized parsimony program (HENNIG86).Astephanus /Microlomais identified as the most stable clade, followed byTylophopropsis/Pentatropis/Rhyncharrhena, Blyttia/DiplostigmaandSchizostephanus/Goydera.A key to the genera is presented, as well as notes on distribution, important characters, and present state of knowledge for each genus. The genusSchizostephanusis resurrected and four new combinations are proposed.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01925.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01920a.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY