Circumscription of Apiaceae tribe Oenantheae
نویسندگان
چکیده
منابع مشابه
Circumscription and phylogeny of Apiaceae subfamily Saniculoideae based on chloroplast DNA sequences.
An estimate of phylogenetic relationships within Apiaceae subfamily Saniculoideae was inferred using data from the chloroplast DNA trnQ-trnK 5'-exon region to clarify the circumscription of the subfamily and to assess the monophyly of its constituent genera. Ninety-one accessions representing 14 genera and 82 species of Apiaceae were examined, including the genera Steganotaenia, Polemanniopsis,...
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متن کاملComputing Circumscription
Circumscription is a transformation of predicate formulas proposed by John McCarthy for the purpose of formalizing non-monotonic aspects of commonsense reasoning. Circumscription is difficult to implement because its definition involves a second-order quantifier. This paper presents metamathematical results that allow us in some cases to replace circumscription by an equivalent first-order form...
متن کاملConstructive Circumscription
Circumscription is one of the most powerful nonmonotonic reasoning formalisms. Its classical modeltheoretic semantics serves as an effective mechanism to ensure minimality in commonsense reasoning. However, as the lack of proof-theoretic feature, it is incapable of expressing derivation order that sometimes plays a crucial role in various reasoning tasks. On the other hand, the general theory o...
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ژورنال
عنوان ژورنال: South African Journal of Botany
سال: 2004
ISSN: 0254-6299
DOI: 10.1016/s0254-6299(15)30222-2