2.1 Plant material
Primulina heterotricha is an endemic perennial shrub with thick
rhizome that inhabits limestone or granite streamsides in forested
valleys, widely distributed in south-central mountain systems of Hainan
Island (Li & Wang, 2005; Wei, 2010; Yang, 2013). Its populations
display a limited range of morphological diversity including irregular
pale yellow or purple corollas. The plant has zygomorphic tubular
flowers which are pollinated by several insects, especiallyGlossamegilla malaccensis (Anthophoridae) Friese and G.
yunnanensis Wu (Anthophoridae)(Ling, 2017). The capsule is erect with
small brown and fusiform shaped seeds, indicating a weak dispersal
capability with no wind- or animal-mediated dispersal features.