This question certainly requires specification. The answers depend heavily on what you are actually want to now.
(1) Morphological evidence considered in total evidence studies; A wide range and the selection depends mostly on the morphological disparity of the lineage inferred. Thus, the answer depends on the lineage of taxa inferred.
(2) Morphological evidence considered in the discussion of studies employing molecular phylogenetic: Again, the answer depends on the organisms studied.
(3) Material used to extract DNA for molecular phylogenetic studies: Again, the answer depends on the organisms studied and the question asked.
The hypothetical answers has one thing in common: it depends very much on the organisms studied.
if I understand your question well: I guess it should be leaf and root i.e. for the 18S molecular identification and/or barcode.
if you mean, which part of a plant can be use regarding extracting DNA, i will answer you many parts, but the best one is leaf (fresh in silica-gel or herbarium ones), but if you mean for discussion part which morphological characters you must pay attention, i will say nothing since morphometric characters are under influence of geographical and environmental features, and are not trustable very much, but still you can compare the taxonomic re traditional studies with the phylogenetic results and compare them with each other.
If you want to know, which morpholopical characters can be used additionally to improve less well resolved trees from molecular studies, this is certainly dependent from the studied plant group. An example from the cactus family is described in the paper of Sanchez & al. 2017: Phylogeny in Echinocereus (Cactaceae) based on combined morphological and molecular evidence: taxonomic implications. In: Systematics and Biodiversity, July 2017
The parts of the plant which is better for the molecular analysis are the growing points (the apical meristem, new leaf, and the growing point of the roots).
Dear Binoy
We need to look into leaf, flagellum, sheath, fruit-shape and size, scales structures in Calamus species.
We are studying molecular characters in relation with morphological traits as Taxonomic implications.
This question certainly requires specification. The answers depend heavily on what you are actually want to now.
(1) Morphological evidence considered in total evidence studies; A wide range and the selection depends mostly on the morphological disparity of the lineage inferred. Thus, the answer depends on the lineage of taxa inferred.
(2) Morphological evidence considered in the discussion of studies employing molecular phylogenetic: Again, the answer depends on the organisms studied.
(3) Material used to extract DNA for molecular phylogenetic studies: Again, the answer depends on the organisms studied and the question asked.
The hypothetical answers has one thing in common: it depends very much on the organisms studied.
I find it very unfortunate that you do not indicate eitherthe taxon or the object of you morphological study.
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