摘要:

SummaryFifty‐six leaf microcharacters were studied in 132 OTUs of the Begoniaceae (Begonia, Hillebrandia). Their taxonomic distribution was compared to the existing classification (sections ofBegonia), to leaf venation types, and to continental origin using the Mantel and the Smouse‐Long‐Sokal tests. Sections originating from the same continent appear to be more closely related on this basis than sections from different continents. Pinnate venation is hypothesized to be homoplasic.

ISSN:0040-0262    

DOI:10.2307/1223359

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryVestiture ofBarbeyais composed of various‐sized, curly, unicellular, non‐glandular trichomes. Attenuate, unicellular (micropapillate), non‐glandular and capitate glandular trichomes common to all Urticales are absent. Pollen ofBarbeya, unlike those of Urticales, is tricolporate, but like those of some more Hamamelididae, has a stratified wall structure containing a thin, granular layer. Evidence from trichome and pollen morphology, as well as from other sources, favors a transfer ofBarbeyafrom Urticales into its own order Barbeyales.Barbeyamay be an independent offshoot from a common ancestor of Casuarinales, Fagales, Juglandales, Myricales, and Urticales.

ISSN:0040-0262    

DOI:10.2307/1223360

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryAn historical account is given of plant collectors in Honduras before 1945, the year when J. Lanjouw published a short list of plant collectors for Honduras with some confusion between Honduras and British Honduras. In particular, he noted R. Temple as a collector from the Republic of Honduras and not from the British colony, now Belize.

ISSN:0040-0262    

DOI:10.2307/1223361

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe dimensions of typical forms of six species ofColeochaete: C. scutata, C. pulvinata, C. soluta, C. divergens, C. irregularis, andC. orbicularis, have been continuously overestimated due to a misinterpretation of an original account by Pringsheim (1860). In this paper correct dimensions are given, and ‘small’ forms of the species are discussed, most of them being found superfluous.

ISSN:0040-0262    

DOI:10.2307/1223362

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryInteractive videodisc information systems are explored as a format for the publication of floras. Images (drawings, photographs, etc.) are very useful in the important task of plant identification. The enormous image storage space and the random access capacity of videodiscs coupled with the information management capacity of personal computers can be an effective and cost‐efficient tool for addressing the botanical information needs of botanists as well as interested non‐botanists. Especially such systems would be helpful in the informational tasks involved in preserving the threatened biodiversity of the world's plants.

ISSN:0040-0262    

DOI:10.2307/1223363

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryEight ratio variables measured on 85 OTUs fromRaouliasubg.Raouliawere studied to explore their distributional properties and discriminating abilities. The ratios are shown to be generally less normal than their constituents, a property that can (to varying degrees) be alleviated by the choice of the numerator as the constituent with the largest coefficient of variation. The discriminating properties of the ratios are shown to be as good as their constituents individually, implying that the ratios are potentially useful variables with unique properties. The problem of redundant variability as a product of including a ratio variable and its two constituents in a data set is also addressed. Given that the deletion of one of these variables is a solution to this, it is shown that removing the ratio does not necessarily optimise the amount of retained variability. Thus, the use of ratio variables is seen to be an empirical a posteriori decision that can be made on the basis of objective criteria.

ISSN:0040-0262    

DOI:10.2307/1223364

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe paper of Skov (1989) has provoked additional comments from an everyday Macintoshuser, which hopefully will help future “Hypertaxonomists” find fully adequate solutions to their needs.The use of HyperCardas a database program for taxonomic data presents one with the problems of a relatively slow program that has a limited capacity for data exchange. This should be evaluated before working with large amounts of data using this program. A combination of dBaseMacand HyperCardis recommended as a push‐button solution as easy to use as HyperTaxonomy by Skov (1989).

ISSN:0040-0262    

DOI:10.2307/1223365

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe taxonomic history ofNassellaDesv. is reviewed and its circumscription expanded to include all species of Stipeae with strongly overlapping lemma margins; lemma apices that are fused into a crown; paleas that are highly reduced, ecostate, and glabrous; long epiblasts; and lemma epidermes with very short fundamental cells having silicified cell walls. The expanded genus includes 79 species, almost all of which are South American.PiptochaetiumandStipasect.Hesperostipaare suggested as the closest extant relatives. Synapomorphies of the three taxa are: brownish callus hairs; fused lemma apices; bulbous‐based lemma cilia; silicified lemma fundamental cells; and long epiblasts. A key to putatively monophyletic groups in American Stipeae and a synopsis ofNassellas.l., involving more than 60 new combinations, are presented. The transferred species include representatives from seven subgenera ofStipaL. described by Spegazzini.

ISSN:0040-0262    

DOI:10.2307/1223366

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryFrom late 1786 to mid‐1787 Swartz worked at the Banksian Museum preparing hisProdromus(1788). Banks permitted him access to Solander's manuscripts, including aFlorula Indiae Occidentalis, as well as the specimens and literature underlying it. Many of Swartz's subsequently published names of new species (and genera) have the same names used in theFlorula.More than 10% of the names in Swartz'sProdromusare asterisked, meaning that they are based on materials (specimens and/or references) found in Banks' collections and appear in Solander'sFlorula.The unpublishedFlorula, aside from its contribution to Swartz's publications, is interesting because it cites collectors and localities, providing an insight into early records.

ISSN:0040-0262    

DOI:10.2307/1223367

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe lycopsids exemplify the instability that characterises both formal (Linnean) and informal (colloquial) nomenclatural schemes for all supra‐ordinal plant taxa. The scheme advocated here (Division Tracheophyta, Class Lycopsida; colloquial name lycopsid) reflects two underlying general principles: 1) A wide range of formal hierarchical levels should be used to indicate putative phylogenetic relationships, and 2) colloquial names should be standardised to most accurately represent the preferred Linnean names.

ISSN:0040-0262    

DOI:10.2307/1223368

出版商:Wiley    

年代:2019

数据来源: WILEY