摘要:

The controversy surrounding the two species commonly known asS. sarrachoidesandS. nitidibaccatumand the problems associated with their typification are discussed. Their hybridization behaviour indicates that two morphogenetically distinct entities are involved, and suggests that these should be recognized at specific rank. The taxon with the fully accrescent mature calyces generally conforms to the species described by Sendtner in 1846 asS. sarrachoides, but the description of a glandular‐haired species with half‐accrescent fruiting calyces by Rusby in 1896 necessitates the acceptance ofS. physalifoliumas the correct name for this taxon. Within this latter species two varieties are recognized, the relatively rare var.physalifoliumwhich has a restricted S American distribution, and the more common var.nitidibaccatum, which, though native to S America, is becoming a successful adventive in Europe, N America, Australia and New Zealand. This variety is based on Bitter's speciesS. nitidibaccatum, and necessitates a new combination. All three taxa are illustrated, details of their morphological variation, their geographical distribution, and relevant synonyms are given, and related species are discus

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01425.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

The proportion of dioecious species in the flora of the British Isles has been underestimated in the past, partly because the total number of native species was overestimated and partly because some dioecious species were omitted for various reasons. We estimate that, in a total native angiosperm flora of 1377 species and species‐equivalents, 4.3% (59 species) are dioecious, a substantially higher percentage than the previous estimates of 2, 3.1 and 3%. If gymnosperms are included, 4.4% (61 of 1380 species of seed plant) are dioecious. A review of published work shows that few of these dioecious species have been well‐studied, and that for some little or no information is available about their sex ratios and reproductive biol

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01426.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

A new identification aid combining features of a polyclave and an analytical key is described. It is based on presence‐or‐absence characters and is presented in the form of a matrix, with the characters in rows and the taxa in columns. The PHYTOTAB program package is used to order the matrix, in order to facilitate identification. The method was used to construct an identification aid for vegetative material and has wider taxonomic and teaching implicati

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01427.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1986.tb01425a.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY