摘要:

A survey of trichome types and their distribution within Plantaginaceae is presented based on a study of 112 species and 30 literary references. 14 different characters were distinguished, some are considered useful for phylogenetic studies. Stomatal types in 32 species are recorded.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb00195.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

An artificial crossing program involving 8 annual form‐series within Hypecoum sect. Hypecoum (Papaveraceae) was carried out. In most combinations between different species, hybrid inviability due to disparity between parental genomes seems to be the most important crossing barrier: chlorotic progeny was produced, or hybrids with low vitality, few and sterile flowers or dwarfishness occurred. The three form‐series considered as different subspecies of H. procumbens seem rather to be separated by hybrid break‐down mechanisms in advanced generations, expressed as malformation of organs, and often pronounced decrease in fertility. Crossings between populations within the same form‐series usually yielded vigorous and highly fertile progeny. The breeding relationships within the group were found to be well correlated with discontinuities in morphological characteristics. The disparity between the genomes of the different form‐series are probably mainly due to gene mutations and cryptic structural alterations and not to major structural poly

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb00196.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.tb00197.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Sideritis syriaca ssp. syriaca is a taxon with a low essential oil content. Its leaves bear glandular trichomes of two types: long hairs with a 4‐celled head, a 4‐celled stalk and a 4‐celled foot (reported for the first time in Lamiaceae) and short hairs with a 4–celled head, a unicellular stalk and a unicellular foot. The second type is considered intermediate between the capitate and peltate hairs, common in Lamiaceae, but found in S. syriaca ssp. syriaca. The ontogeny of the trichome types is described. The possible significance of the glandular trichome structure to Lamiaceae systematics is further di

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb00198.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.tb00199.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The floral morphology of the southern African genera of Orchideae‐Habenariinae (Bonatea, Cynorkis, Habenaria, Platycoryne, Stenoglottis, Centrostigma and Roe‐perocharis) is surveyed paying special attention to the gynostemium. Ontogenetic data are provided for the species from which adequate material was available. It is shown that the floral architecture is essentially an elaboration and complication of that found in the better known Orchidinae. The structural similarities are particularly evident in the early ontogeny. Although the tribe Orchideae is commonly said to have gynostemia with erect anthers, a few Habenariinae are reported here to have reflexed anthers. In most cases both ‘auricles’ (filament excrescences) and ‘basal bulges’ (staminodes) are united to form the lateral gynostemium appendages. The primordia of both structures are clearly recognizable in the early ontogeny in all species studied. In Habenaria dregeana the basal bulges are only basally fused to the auricles, but in their main portion become adnate to the lip and petal bases: the auricles then solely form the lateral gynostemium appendages. It is suspected that this occurs also in other species not studied here. Systematic and phylogenetic aspects of the southern African representatives of the Habenariinae are discussed: the generic separation of Bonatea, Platycoryne and Centrostigma from Habenaria does not appear justified. Cynorkis, Roeperocharis and Stenoglottis are morphologically dissimilar to Habenaria. Based on the findings in the southern African taxa the status of the Habenariinae, Orchidinae, Orchideae and Diseae is discussed: there is no clear distinction between Habenariinae and Orchidinae; while the Diseae seem to represent a monophyletic group, the Orchideae are possibly p

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb00200.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Book reviewed in this article:Maydell, H.‐J. von. 1990. Trees and Shrubs of the Sa‐hel: their characteristics and uses.Braun, M., Burgstaller, H., Hamdoum, A. M.&Walter, H. 1991. Common Weeds of Central Su

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb00201.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

The South American family Calyceraceae is analysed and some new observations on pollen and petal epidermis‐patterns are presented. The new characters give some indication of a relationship to Compositae. The choice of Calyceraceae as the sister‐group of Compositae is discussed, and it is further suggested that Compositae, Calyceraceae, and Lobeliaceae constitute a clade. Two new specific combinations in the Calyceraceae are formally established: Gamocarpha alpina and Calycera and

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb00202.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.tb00203.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

Adenia pulchra sp. nov. from Bale Region, southern Ethiopia, is described and its relationships discussed.

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1992.tb00204.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY