Sequences of the internal transcribed spacers (ITS1 and ITS2) of nuclear ribosomal DNA were analysed for 44 Artemisia species (46 populations) representing all the five classical subgenera and the geographical range of the genus, 11 species from 10 genera closely related to Artemisia, and six outgroup species from five other genera of the Anthemideae. The results definitely support the monophyly of the genus Artemisia in its broadest sense (including some Hippolytia, Kaschgaria). Our results, correlated to other data, such as pollen morphology, allow us to conclude that the subtribe Artemisiinae as currently defined is a very heterogeneous group. Affinities of the largest genus of the subtribe and tribe, Artemisia, and of other genera of the subtribe to some genera from other subtribes of the Anthemideae strongly suggest that subtribe Artemisiinae needs a deep revision and redefinition. Phylogenetic utility of region trnL-F of the plastid DNA in the genus Artemisia and allies was also evaluated; sequences of the trnL-F region in Artemisia do not provide phylogenetic information.
JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT) is collaborating with JSTOR to digitize, preserve and extend access to Taxon. Summary Torrell, M., Garcia-Jacas, N., Susanna, A. & Valles, J.: Phylogeny in Artemisia (Asteraceae, Anthemideae) inferred from nuclear ribosomal DNA (ITS) sequences. -Taxon 48: 721-736. 1999. -ISSN 0040-0262.The internal transcribed spacers (ITS-1 and ITS-2) of nuclear ribosomal DNA were sequenced for 33 populations of 31 species of Artemisia. The sequence data support the monophyly of the genus in its classical, broad sense, including Seriphidium and Oligosporus. Five main clades are defined, corresponding largely to the four main groups traditionally recognised in the genus: "Artemisia" (s.str.), "Absinthium", "Dracunculus", and "Seriphidium", plus the American "Tridentatae" segregated from the latter, except that "Artemisia", scattered over four different clades, is in need of a redefinition and restriction to the A. vulgaris clade. ITS data also support the hypothesis that the "Tridentatae" and "Seriphidium" are independent groups, and help differentiate the species in the A. herbaalba complex. This content downloaded from 193.104.110.107 on Tue, 10 Jun 2014 20:39:58 PM All use subject to JSTOR Terms and ConditionsTAXON 48 -NOVEMBER 1999 and hermaphroditic, fertile central florets, and a hairy receptacle. A. sect. Dracunculus Besser (A. subg. Dracunculus (Besser) Rydb.; Oligosporus Cass.) has heterogamous capitula with female outer florets and seemingly hermaphroditic but functionally male central florets, and a glabrous receptacle. A. sect. Seriphidium (Besser) Besser (A. subg. Seriphidium Besser; Seriphidium (Besser) Fourr.) has homogamous capitula with all florets hermaphroditic and fertile, and a glabrous receptacle. Our "Seriphidium" shall, however, exclude the "Tridentatae", i.e. A. sect. Tridentatae Rydb. (A. subg. Tridentatae (Rydb.) McArthur), a taxon established by Rydberg (1916) within A. subg. Seriphidium to include most of its North American members and later raised to the rank of a separate subgenus by McArthur & al. (1981). When working on the genus Artemisia, one soon gets the impression that, as Persson (1974) has stated, the present infrageneric subdivisions do not represent natural groups. To obtain a more natural grouping, some authors have proposed sections, subsections and series (Rydberga global treatment of the entire genus at these levels has not yet been achieved.Some authors have considered the main groups within Artemisia, at various infrageneric levels (e.g. as sections or subgenera) and with varying circumscriptions, while others have proposed to split the genus. Early on, Cassini (1817) transferred the "Dracunculus" ...
Genome size was estimated by flow cytometry in 24 populations belonging to 22 Artemisia taxa (21 species, 1 with two subspecies), which represent the distinct subgenera, life forms, basic chromosome numbers, and ploidy levels in the genus. 2C nuclear DNA content values range from 3.5 to 25.65 pg, which represents a more than sevenfold variation. DNA content per haploid genome ranges from 1.75 to 5.76 pg. DNA amount is very well correlated with karyotype length and ploidy level. Some variations in genome size have systematic and evolutionary implications, whereas others are linked to ecological selection pressures.
Using optical and scanning electron microscopy, we completed a palynological study of the subtribe Artemisiinae (Asteraceae, Anthemideae), which we started in a previous paper. This subtribe contains different genera with a systematic position that, in many cases, has been controversial. There is a group of genera closely related to Artemisia, and another one more related to Chrysanthemum sensu lato. We confirm the existence of two pollen morphological patterns ‐ concerning exine ornamentation ‐ in the tribe Anthemideae and in the subtribe Artemisiinae as currently considered: one with long spines (Anthemis type) and the other with short spinules (Artemisia type). This feature is a good taxonomic marker, well correlated with other morphological and with molecular characters. This enables a new delimitation of the subtribe Artemisiinae, which is characterized by pollen grain ornamentation constituted by short spinules (microechinate pollen), and should be restricted to Artemisia and the closely related genera that share this trait.
Using optical and scanning electron microscopy, we carried out a palynological study of some plant species with a systematic position that has been controversial. One of the taxa belongs to the genus Artemisia (Asteraceae, Anthemideae), but has been described in another genus (Artemisia incana/Tanacetum incanum). The remaining taxa have been named or combined in Artemisia but are now considered members of small genera mostly segregated from Artemisia (Ajania, Hippolytia, Kaschgaria, Lepidolopsis, Mausolea, Turaniphytum), or belong to very close genera (Brachanthemum, Sphaeromeria). We confirm the existence of two pollen morphological patterns ‐ concerning ornamentation ‐ in the tribe Anthemideae: one with long spines (Anthemis type) and the other with short spinules (Artemisia type). Artemisia and its related genera can also be divided into two groups according to this feature, which is a good taxonomic marker, well correlated with other morphological and molecular characters.
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