摘要:

SummaryThe structure of the xylem body of nine woody species ofSedumbelonging to two different groups was studied with respect to the character states of the characters correlated with the hybridization patterns of the species. No significant differences in the structure of the wood were found between the specialized and less advanced species. Like the wood ofAeonium, Kalanchoe, andCotyledon, the features of the wood ofSedumindicate secondary woodiness or paedomorphosis. These results support the idea that the Crassulaceae descended from an herbaceous ancestor and that woodiness evolved independently in several groups.

ISSN:0040-0262    

DOI:10.2307/1222628

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe names of the twoEphedra‐species validly published in P. Forsskål'sFlora aegyptiaco‐arabicaare typified:E. aphyllaForssk. by means of a neotype, andE. foemineaForssk. by designation of a lectotype. Arguments and details in support of the decisions are provided. Hitherto,E. aphyllahas usually been calledE. alteC. Meyer. The type material of the later publishedE. alteis in fact a mixture ofE. aphylla(male specimens) andE. foliataBoiss. ex C. Meyer (female specimens).Ephedra foemineaalso has priority againstE. campylopodaC. Meyer. The species and their closer relatives are compared with respect to their morphology, ecology and distribution.

ISSN:0040-0262    

DOI:10.2307/1222629

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryJames Bowie served Kew as a plant collector in Brazil and at the Cape of Good Hope. From an examination of the itineraries of the four journeys he undertook to the southern African interior during his initial stay at the Cape it is possible to deduce the most likely type locality (vicinity of Algoa Bay) and approximate date of collection (30 December 1821–26 February 1822) ofAloe bowieaSchult.&J. H. Schult. Detailed grid references are provided and should enable systematists to pinpoint the localities in which Bowie collected. An enumeration is given of Bowie's publications on Cape plants.

ISSN:0040-0262    

DOI:10.2307/1222630

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryIn the late nineteenth century C. A. and P. C. Candargy made the first extensive inventory of the flora and vegetation of the island of Lesvos (Greece), and P. C. Candargy published a revision of the Hordeae (=tribus Triticeae, Poaceae). The activities of the Candargys are poorly known as are most of their publications. The present biography and bibliography provides some biographical data and clarifies their botanical writings. For each taxonomic paper the approximate date of publication is given.

ISSN:0040-0262    

DOI:10.2307/1222631

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryTwenty‐seven treatments of plant specimens were examined to determine their effects on the quantity and quality of DNA obtained from spinach leaves. Treatments included various drying methods, cold storage, and chemical preservatives. Good yields of quality genomic DNA (30–50 kbp) were obtained from fresh, frozen, and dried leaves, but none of the chemical preservatives yielded high molecular weight DNA, even after only three to seven days of storage. The application of the hot CTAB procedure to fresh and dried leaves ofGinkgo biloba, Juniperus ashei, J. virginiana, Magnolia grandiflora, Phoradendron tomentosum. Pinus ponderosa, Quercus virginianaandThuja orientalis, species that possess considerable tannins, yielded high molecular weight DNA from all the fresh leaves with some degradation. The dried leaves ofJuniperus ashei, Quercus virginianaandMagnolia grandiflorayielded only small amounts of high molecular weight DNA with the hot CTAB extraction procedure.

ISSN:0040-0262    

DOI:10.2307/1222632

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryA HyperCard™application for Macintosh™computers is used to manage data for herbarium taxonomy. All information necessary for taxonomic revisions, including text, figures, maps, and drawings, is stored in one program package. Screen forms are designed to simulate card indices as they are commonly used by taxonomists. Output includes taxonomic reports with complete nomenclature, and literature and specimen citations. Computer generated descriptions can be added to the reports. A multi‐access key allows the user to identify collections and check descriptions. Distribution maps and simple character analysis can be printed. Dictionaries containing abbreviations of periodicals and author names are included for “on‐line” help.

ISSN:0040-0262    

DOI:10.2307/1222633

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryLeaves ofNicotiana tabacumL. cvSamsunwere selected because of the volatile nature of their active principle, nicotine. They were dried by four different methods: air‐dried, oven‐dried at 60°C, freeze‐dried, and dried in a microwave oven. The four samples of dried leaves were compared as to their microscopical characters and alkaloid content. After drying by microwaves, it remained possible to identify the leaves by their botanical characteristics. Their alkaloid content was qualitatively unchanged and quantitatively slightly superior to that of leaves dried by the other methods.

ISSN:0040-0262    

DOI:10.2307/1222634

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe following adhesives for mounting herbarium specimens, based on methyl‐cellulose, are described and discussed: methyl‐cellulose in alcoholic solutions for mounting labels and packets; specimen mounting‐glue based on a mixture of methyl‐cellulose and polyvinyl acetate; strapping with cotton tape or string impregnated with methyl‐cellulose; and a liquid cellulosic substitute for cloth strapping.

ISSN:0040-0262    

DOI:10.2307/1222635

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1222636

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1222637

出版商:Wiley    

年代:2019

数据来源: WILEY