Oral Paper

         Floristics & Taxonomy

Systematics and biogeography of Larix (Pinaceae) using target capture sequencing

Presenting Author
Lydia Paradiso
Description
The genus Larix Mill. (Pinaceae), commonly known as larch, consists of 10–15 species of conifers which form an integral part of circumboreal forests throughout Eurasia and North America. Larches succeed across a wide ecological gradient from lowlands to treeline due to their cold tolerance, deciduousness, and role as pioneer species. Larch species have been widely cultivated for products including timber, turpentine and dietary supplements. Despite the economic and ecological significance of larch, phylogenetic relationships remain unresolved. Historically, species of larch were placed in two groups based on cone bract length. However, results from early molecular studies refuted this classification, instead presenting geography-based clades with variable bract morphology. To date, there have been no multi-locus studies which include all species of Larix.  Representatives of all putative species were sampled from herbarium specimens up to 75 years old. Target capture sequencing, including selected Angiosperm353 and GoFlag408 probes, paired with morphological characters, were used to reconstruct the phylogeny and biogeography of the genus.