Pollen morphology and the systematic position of Triplostegia (Dipsacales)

Nilsson, Siwert (författare): Naturhistoriska Riksmuséet,Palynologiska Laboratoriet

(creator_code:org_t)

INT ASSOC PLANT TAXONOMY, 1997
1997
Engelska.
Ingår i: Taxon. - : INT ASSOC PLANT TAXONOMY. - 0040-0262 .- 1996-8175. ; 46:1, s. 21-31

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Abstract Ämnesord

Stäng

Triplostegia comprises two species of perennial herbs from southeast Asia, T. glandulifera and T. grandiflora. The systematic position of the genus has been debated ever since it was described, and it has been placed in either Dipsacaceae or Valerianaceae, or in a family of its own Triplo-stegiaceae. Pollen of Triplostegia, investigated by light microscopy and scanning electron micro-scopy, is similar to that of both Dipsacaceae and Valerianaceae. Presence of numerous branched and bent columellae as well as an aperturem argins tructurer esemblingt he halo found in Valeria-naceae indicates a closer relationship to the Valerianaceae. A sister-group relationship between Triplostegia and the Valerianaceae is furthermore supported by other studies of molecular and morphological data. In order to maximize information content in the framework of mandatory classificational ranks, Triplostegia is best included in the family Valerianaceae, as the sole mem-ber of a subfamily Triplostegioideae.

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