摘要:

Morphological data were gathered from 126 herbarium specimens representing ten species ofPsophocarpus.Specimens were scored for 29 vegetative, 46 inflorescence, 16 legume and six seed characters. The data were analysed using cluster analysis and ordination and the results used to produce an overall phenetic classification. The proposed classification includes a tenth species recently distinguished, but undescribed by Verdcourt. Keys are provided to the subgenera and sections, as well as the ten taxa recognized and the classification is discussed in relation to previous classifications of the genus.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb01871.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

The morphological features of the cuticles of the leaves, nectaries and stamen filaments of eleven newly published species ofEucalyptusfrom Central Australia are described and illustrated. The species form four groupS. Within each group, the gross morphology of the species is sufficiently uniform to present difficulty in identification of specimenS. However, the species differ from each other in both qualitative and quantitative cuticular features. The quantitative features include stomatal size and the frequency spectra of subsidiary cells. The abaxial and adaxial frequency spectra of a given species are usually different from each other, but the spectra of different specimens of the same species are closely similar and differ from those of other species of the same group. The general features of the nectary are described. The species differ in nectary pore size, whether the pores are complanate or sunk, etc. Other microscopic features of the nectary cuticles are also species‐specific. Different species are shown to have different patterns of the cuticular ornamentation of the stamen filaments.The importance of cuticular features in identification and definitions of the term ‘subsidiary cell’ are discussed. Cuticular ornamentation differs in leaves, nectaries and stamen filaments, yet the nature of the cuticle remains the same. Species with relatively large stomata may have small nectary pores, andvice versa.The genetic control of the cuticular features is different in and independent for each tissue, in the leaf even for the abaxial and adaxial surfaces. The adaptive value of cuticular features, especially of the leaves, and the radiative evolution of the Central Australian bloodwoods are disc

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb01872.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

The North African genusPerralderia(Asteraceae‐Inuleae‐Inulinae) is revised. Three species and two subspecies are recognized. The systematic position, phylogeny and biogeography of the genus are also discus

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb01873.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

TheDiascia(Scrophulariaceae) window: an orientation cue for oil‐collecting beeS. Flowers ofDiasciasectionRacemosaeare characterized by an unusual translucent ‘window’ at the base of the upper corolla lip which is bright yellow with maroon flecks and varies from a nearly flat to a deeply cone‐shaped depression. The inner epidermal cells of the window are also variable in shape ranging from lenticular to long papillate. In contrast to the surrounding corolla which strongly reflects ultraviolet light, the window tissue is strongly ultraviolet absorptive due to the presence of ultraviolet absorbing flavonoids in the epidermal cellS. Observations in natural and experimental situations suggest that the window is used as an orientation cue by oil‐collec

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb01874.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

Book reviewed in this article:Origins and Evolution of GymnospermsPlant canopies: their growth, form, and functionKew index for 1988, compiled by F.A.Davies&K.M. Lloyd. Oxford: ClarendonTaschenworter buck der botanischen Pflanzennamen filr GartnerWild Flowers of Majorca, Minorca and Ibiza: with keys to the flora of the Balearic Islands by Elspeth BeckettAn Atlas of Seaweeds of Northumberland and Durham

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1990.tb01875.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY