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Systematic and biogeographic study o...

Zamluk, Elizabeth Anne.

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Systematic and biogeographic study of a plant species complex: Aster section Eucephalus.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Systematic and biogeographic study of a plant species complex: Aster section Eucephalus./
作者:	Zamluk, Elizabeth Anne.
面頁冊數:	224 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 5868.
Contained By:	Dissertation Abstracts International60-12B.
標題:	Biology, Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ45353
ISBN:	9780612453531

Systematic and biogeographic study of a plant species complex: Aster section Eucephalus.
Zamluk, Elizabeth Anne.

Systematic and biogeographic study of a plant species complex: Aster section Eucephalus. - 224 p.

Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 5868.

Thesis (Ph.D.)--University of Victoria (Canada), 2000.

Aster section Eucephalus (Nutt.) Munz & Keck is comprised of about 16 taxa in North America (some rare and localized, others abundant and widespread) which appear to form a homogeneous, and probably monophyletic, group. I used a stratified sampling design to select 141 specimens from 1,669 loaned herbarium sheets. I chose morphological characters for analysis on the basis of character descriptions and the taxonomic history of Aster section Eucephalus species derived from published scientific papers and floras.

ISBN: 9780612453531Subjects--Topical Terms:

1017825
Biology, Botany.

Systematic and biogeographic study of a plant species complex: Aster section Eucephalus.
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245 1 0 $a Systematic and biogeographic study of a plant species complex: Aster section Eucephalus.
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500 $a Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 5868.
500 $a Adviser: Geraldine Allen.
502 $a Thesis (Ph.D.)--University of Victoria (Canada), 2000.
520 $a Aster section Eucephalus (Nutt.) Munz & Keck is comprised of about 16 taxa in North America (some rare and localized, others abundant and widespread) which appear to form a homogeneous, and probably monophyletic, group. I used a stratified sampling design to select 141 specimens from 1,669 loaned herbarium sheets. I chose morphological characters for analysis on the basis of character descriptions and the taxonomic history of Aster section Eucephalus species derived from published scientific papers and floras.
520 $a Twenty-five phenetic groups remained after the iterative adjustment process. Taxonomic names were assigned to the phenetic groups based on published descriptions. Aster eastwoodiae Zaml. comb. nov. (Aster bicolor was not an available name for this taxon) reinstates a morphologically distinct taxon (Eucephalus bicolor Eastwood), previously included in A. brickellioides (Greene) Greene, that is endemic to the Klamath region of Oregon and California. Aster engelmanni Gray is divided into var. engelmannii and var. monticola Zaml. var. nov. based on size, number of phyllary rows on the involucre, and trichome characteristics. Aster wasatchensis (Jones) Blake is separated into var. wasatchensis and var. grandifolius Zaml. var. nov. based on plant size, phyllary colours, and leaf trichome characteristics.
520 $a Locality information gathered from herbarium labels was used to produce distribution maps. Biogeographic distribution information combined with cladistic results, and an assumption of a founding taxon from Mexico (Noyes and Rieseberg (1999) hypothesised that New World asters were derived from southern taxa) suggested several biogeographical hypotheses for Aster section Eucephalus. Four lines of descent were hypothesised to give rise to (1) an ancestral form in the Sierra Nevada; (2) an ancestral form in the Siskiyou Mountains of Oregon, together with Aster glaucodes Blake in the Great Basin and the Rocky Mountains; (3) a widespread group including Aster engelmannii Gray, A. vialis (Bradshaw) Blake, A. perelegans Nels. & Macbr., and A. glaucescens (Gray) Blake, and (4) A. wasatchensis (Jones) Blake in Utah. (Abstract shortened by UMI.).
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