摘要:

SummaryThe interpretation of the phylloclade ofPhyllocladusby Keng (1974) as an ancient link between lateral branch systems of progymnosperms and the simple leaves of modern conifers is critically examined in the light of patterns of vascularisation, and his erection of the monogeneric family Phyllocladaceae (Keng, 1973, 1978) is challenged.

ISSN:0040-0262    

DOI:10.2307/1221846

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryMathieuaandPlagiolirionare two poorly known, monotypic genera of petiolate‐leaved neotropical Amaryllidaceae that have been variously treated as synonyms forEucharis, UrceolinaorHymenocallissubg.Elisena.Taxonomic history, morphological characters, phytogeography, and ecology of both genera are reviewed. From the available data,Mathieuaappears most closely related toStenomesson. Plagiolirionshows greatest relationship toHymenocallissubg.Elisena.The supposition that Linden's combinationof Eucharis galanthoideswas based onMathieua galanthoidesis shown to be false, andE. galanthoidesis declared a nomen nudum. The significance of a number of rare and small or monotypic genera of Amaryllidaceae in the northern Andes, with characters intermediate between various larger genera, is discussed.

ISSN:0040-0262    

DOI:10.2307/1221847

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryAttempts to infect the four cytodemes ofAnthoxanthum odoratumL. s. lat. (Poaceae) withPuccinia sardonensisGäumann (Uredinales) were successful with half the individuals ofA. alpinumA.&D. Löve (diploid and tetraploid) but not with those ofA. odoratums. str. (diploid and tetraploid). For each cytodeme, the sensitivity to the parasite was not dependent on the origin of the material and no correlation was established between the distribution of the rust and that of susceptible individuals. Susceptibility and resistance toP. sardonensiswould therefore probably be long‐established characteristics which originated at the time of differentiation of the two diploid taxaof A. odoratums. str. and ofA. alpinumbut which preceded their respective polyploidization phases. Resistance to infection would have no adaptive value since resistantA. odoratumis not exposed to infection in nature and probably never has been. These results support the division ofA. odoratums. lat. intoA. alpinumandA. odoratum.RésuméDes essais d'infection des quatre cytodèmes d'Anthoxanthum odoratumL. s. lat. (Poaceae) parPuccinia sardonensisGäumann (Urédinée) réussissent sur la moitié des individus d'A. alpinumA.&D. Löve (diploïde et tétraploïde) mais jamais sur ceux d'A. odoratums. str. (diploïde et tétraploïde). Pour chaque cytodème, la sensibilité au parasite est indépendante de l'origine du matériel et aucune corrélation n'a été établie entre la distribution de la rouille et celle des individus sensibles. La susceptibilité et la résistance àP. sardonensisreprésenteraient done des caractères anciens dont l'apparition serait contemporaine de la différentiation des deux taxons diploïdes d'A odoratums. str. et d'A alpinummais antérieure à leurs phases respectives de polyploïdisation. La résistance à l'infection n'aurait pas de valeur adaptative puisqueA. odoratumrésistant n'est pas exposé à l'infection dans la nature et ne l'a vraisemblablement jamais été. Ces résultats témoignent de l'indépendance taxonomique d'A alpinumet d'A. odoratum.

ISSN:0040-0262    

DOI:10.2307/1221848

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryAn enigmatic, highly localized endemic of the Far‐Eastern USSR was first considered a species ofMedicago, subsequently transferred toTrigonella, and most recently elevated to the monotypic genusUrsiaVass. Its affinities, however, are withTrifolium, particularly withT. eximium, but also with the only sympatric indigenous clover,T. lupinaster.

ISSN:0040-0262    

DOI:10.2307/1221849

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1221850

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1221851

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1221852

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryBuchoz (1779) published the genusLassoniawith two species,L. heptapetaandL. quinquepetabased on plant figures of Chinese origin first published by Buchoz in 1776. Only the Chinese vernacular names Yulan and Xinyi (or Mulan) appear on the original plates. In 1934, Dandy transferred bothL. heptapetaandL. quinquepetato the genusMagnolia, but these names of Buchoz were later rejected by him in preference ofMagnolia denudataandM. liliifloraof Desrousseaux. More recently the Buchoz names have been resurrected by several authors which has resulted in a running controversy over the Buchoz names as to their application in the genusMagnolia.In fact, the figures themselves are without any redeeming botanical value whatsoever, as a close scrutiny of the figures reveals. The namesMagnolia heptapeta(Buchoz) Dandy andM. quinquepeta(Buchoz) Dandy are categorically rejected asincertae sedis, because the Buchoz figures do not match the species to which some people apply his names, thus leaving the names unapplied and without identifiable types. The earliest applicable names for the taxa in question with the Chinese names Yulan and Mulan areMagnolia denudataandM. liliiflora, respectively, both of Desrousseaux (1791), based on the earlier illustrations of Kaempfer.

ISSN:0040-0262    

DOI:10.2307/1221853

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1221854

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe sectional nomenclature inTaraxacum(Cichoriaceae) is discussed (cf. Richards, Taxon 34:633–644, 1985). The status of Dahlstedt's sectional names and their typification are dealt with. Results of this analysis are compared with infrageneric taxa published by Handel‐Mazzetti (1907) and with the Richards paper. Attention is paid to the typification of the sectionsPalustria, Borealia, Ceratophora, ErythrospermaandSubvulgaria.The nameT.sect.Vulgaria(Dahlst.) Dahlst. is shown to be illegitimate; a new section is described to accommodate the most common group of dandelions in central and northwestern Europe. A list of corrections and additions to the Richards sectional list is added.

ISSN:0040-0262    

DOI:10.2307/1221855

出版商:Wiley    

年代:2019

数据来源: WILEY