摘要:

The octoploidDraba cacuminum(Brassicaceae) is one of the few endemic species in Scandinavia and has frequently been considered an example supporting the glacial survival theory. Two subspecies, ssp.cacuminumin southern Norway and ssp.angusticarpain northern Scandinavia, have been described and suggested to be geographically diverged remnants of a more continuously distributed ancestor. To test an alternative hypothesis of independent origins of similar octoploids in different areas, we investigated populations ofD. cacuminumand its possible progenitors using enzyme electrophoresis and morphological analysis. Electrophoretic analysis of progeny ofD. cacuminumrevealed high levels of fixed heterozygosity, suggesting that the species is a genetic alloploid. Fixed electrophoretic differences among the populations and additivity of electrophoretic phenotypes indicate that the octoploidD. cacuminumhas originated at least three times by alloploidizations involving different populations of the hexaploidD. norvegicaand a diploid species, possiblyD. fladnizensis.Electrophoretic and morphometric data suggest that populations ofD. cacuminumwith broad siliculae have originated from populations ofD. norvegicathat had broad siliculae, and that populations ofD. cacuminumwith narrow siliculae have originated from populations ofD. norvegicathat had narrow siliculae. However, the electrophoretic and morphometric variation withinD. cacuminumdid not correspond to the geographic origin of the populations, and the previously described subspecies could not be recognized.Draba cacuminumgives no relevant information on the glacial survival theory; the polyploidizations may have occurred in postglacial time as well as in pre‐Weichselian period

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01303.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The pericarp structure has been investigated in about 205 species, representing 43 out of the about 50 genera of Lamiaceae subfamily Nepetoideae tribe Ocimeae (Ocimoideae). In its basic structure, the pericarp of Ocimeae corresponds to that of other Nepetoideae. The exocarp has usually both mucilaginous and non‐mucilaginous cells. Below it, there are soft cells (mesocarp), a layer of vertically arranged bone cells and a thin innermost cell layer. The differences discovered in pericarp anatomy essentially agree with the traditional subdivisions of Ocimeae (by e.g. Briquet). The subtribes Hyptidinae and Ociminae and the genusAeollanthus(in subtribe Plectran‐thinae) have, with few exceptions crystals in the bone cells. Unlike other Labiatae, Plectranthinae (exceptAlvesia, IsodonandSiphocranion) has a plate‐like content in the mucilaginous cell. The systematic position of the latter three genera is discussed. Because of their pericarp anatomy,Hoslundia, Fuerstia, Catoferia, Nosema, Benguellia, OctomeronandCeratanthusare suggested to belong to Ociminae, andNeohyptisto Plectranthinae. On the basis of pericarp characters an informal division of Ociminae is suggested. Considering the distribution of stamen and pericarp characters, the generaCapitanya, PycnostachysandSolenostemonare suggested to originate fromPlectranthus.Ocimeae species which grow in arid habitats tend to produce more mucilage and to have a larger plate‐like content in the mucilaginous cells than species from moist or wet h

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01304.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Eight nectary types ofRanunculussubgenusBatrachiumon the Aegean islands and adjacent areas are described, and presented in camera lucida drawings and scanning electron micrographs (SEM). Their relation to taxa and the variation in and between populations are discussed. The appearance of the nectary is one of the most useful morphological characters taxonomically, and is also useful for revealing the hybrid origin of many populations. The breeding system of Aegean taxa and the probable evolution of the nectary types are discussed.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01305.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Two new taxa ofArdisiafrom Thailand,A. integraandA. corymbiferavar.euryoides, are described and illustrated.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01306.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01307.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The following new species are described:Indigofera bayensis(south‐west Somalia, on sand or gravel inAcacia‐Commiphorabushland),I. gypsacea(central and south‐west Somalia, on gypsum),I. karkarensis(north‐east Somalia, on limestone),I. lamellata(south‐west Somalia, on and around granitic outcrops),I. lughensis(south‐west Somalia, on gypsum),I. phymatodea(south‐west Somalia, on granitic outcrops),I. scopiformis(central Somalia, on sand inAcacia‐Commiphorabushland), andMicrocharis nematophylla(central Somalia, on sand inAcacia‐Commiphorabushland).Indigofera pseudointricata, previously known only from Socotra, is reported

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01308.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Three cytotypes at the diploid and tetraploid level ofCucumis zeyheriwere investigated by means of multivariate morphological analysis, for pollen structure and by analysis of meiosis. Two main groups emerged after principal component and cluster analyses. Diploids and autotetraploids were placed in one group designated asC. zeyheri, the allotetraploids formed a separate group. Autotetraploids showed a mean number of one quadrivalent per pollen mother cell, together with 10% tetra‐porate pollen grains indicating an autoploid origin. The allotetraploids may have originated from polyploidization after hybridization ofC. zeyheriandC. prophetarum.They are described as the new speciesC. diniae, which differs fromC. zeyheriin leaf colour and width of leaf lobes, and fromC. prophetarumin the concolour fruits. Leaf shape and leaf incision is intermediate between the parent

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01309.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The first species ofIsoglossaknown from Somalia,I. congestais described om material from central Somalia and SE Ethiopia. It is related toI. parvifoliaRendle, occurring in E Ethiopia, but differs in the contracted inflorescences and long calyx lobes with long glandular hairs.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01310.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Four new species,Cruddasia craibii, Flemingia kradungensis, F. tiliaceaandPueraria maeseniiare described and illustrated. The following new combinations are proposed:Cruddasia pinnata; C. laotica, Dolichos grahamianus; D. oxyphyllus; Dolichovigna pilosa; Erythrina strictavar.suberosa; Flemingia macrophyllavar.sootepensis; Pueraria candolleivar.mirifica; Shuteria suffultavar.sinensisandVigna radiatavar.grandiflora. Pueraria rigensis moved to the tribe Millettieae (=Mellettia rigens).

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01311.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Qualitive and quantitative data are presented on wood anatomy and cambial conformations of four species of Cucurbitaceae. Although all woody to various degrees, the four species were selected to show a wide range of habits and therefore to discern possible correlations between habit and wood anatomy. Vessels are widely spaced and libriform fibers are minimal where storage of water and carbohydrates is prominent. Axial parenchyma is dimorphic: lignified thick‐walled paratracheal may lend strength to the vessel elements (which are wider than long), whereas thin‐walled apotracheal parenchyma may lend flexibility to stems (especially in lianoid species) and serve for storage. Rays are multiseriate only and alter little from primary rays (but large multiseriate rays originate suddently in fascicular areas of one species). Distribution and abundance of libriform fibers relate to habit: most abundant in the shrubbyAcanthosicyos, least in the storage‐oriented lower stems ofApondanthera). Vasicentric tracheids extend radially and interconnect vessels, potentially providing a subsidiary conductive system that would maintain the conductive pathways of the large vessels if some of those vessels were to be disabled or deactivated. Cucurbitaceae are characterized by septate fibers, vasicentric tracheids, and storied wood structure. Each of these features is found in at least half of the families now commonly included in Violales, to which Cucurbitaceae are thought to b

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb01312.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY