Phylogenetic Relationships within the Rhodoreae (Ericaceae) with Specific Comments on the Placement of Ledum

摘要: The cladistic relationships of the tribe Rhodoreae (Ericaceae; Rhododendroideae) are investigated. is likely monophyletic, and may be diagnosed by perulae found with inflorescence. genus Rhododendron, as currently recognized, shown to paraphyletic. However, if Ledum included (as a subsection sect. within subg. Rhododendron), Therorhodion excluded, then probably monophyletic. related most closely Rhododendron subsect. Edgeworthia. consistent recognition eight subgenera: Anthodendron, Azaleastrum, Candidastrum, Chonias- trum, Hymenanthes, Mumeazalea, Tsutsusi. monophyly Copeland's segregate genera thus, in large part, supported, although these groups placed here at subgeneric rank. Among subgenera, Anthodendron possibly cladistically basal. This subgenus phe- netically similar subgenera Tsutsusi, Choniastrum, Mumeazalea have been recognized traditionally "azalea complex" or chorus subgenerum Nomazalea, but this group paraphyletic should not given formal taxonomic recognition. circumscription phylogenetic some e.g., Azaleastrum broadly defined, i.e., in- cluding Canadidastrum) need further study. Menziesia Tsusiophyllum recognizable generic level, due shared possession slit-like anther dehiscence. Thus, pattern character variation expressed bv four genera: Therorhodioni, Menziesia, Tsusiophyllurn, Rhododendronq fol- lowing new combinations made: Ledum, R. palustre, groenlandi cum.