A phylogenetic review of Bupleureae, Bupleurum exscapum, a new combination for Hohenackeria exscapa

A phylogenetic study of the tribe Bupleureae (Apiaceae) was conducted using nrDNA ITS data. The results show that Bupleureae has a distinct position within the family, comprising two distinct clades. Hohenackeria exscapa is placed in a clade with other examined species of the genus Bupleurum. Traditionally, the genus Hohenackeria, was considered a close relative of Bupleurum but differs from it in having white flowers, sessile umbels, a conspicuous calyx, the absence of bracteoles and a carpophore. Phylogenetic results represented Hohenackeria exscapa within Bupleurum subgen. Bupleurum, close to B. baldense. Several morphological characters and phylogenetic signals support their relationships. Both species have slender tap roots, linear to oblong-lanceolate leaves that attenuate into a petiole with sessile cauline leaves. Flowers and fruits in B. baldense are generally enveloped by bracteoles, and pedicels are subequal and short, while in H. exscapa pedicels are shorter and umbels are hidden by radical leaves instead of bracteoles, so the concave bracteoles in B. baldense may play the hiding role for umbels. Hohenackeria exscapa was here subsumed within Bupleurum as a new combination.

کلیدواژه ها:

Apiaceae ، Bupleurum ، Molecular Phylogeny ، new combination ، nrDNA ITS ، Iran