A Taxonomic Revision of Canscora, Cracosna, Duplipetala, Hoppea, Microrphium, Phyllocyclus and Schinziella (Gentianaceae–Canscorinae)

Abstract

SUMMarya taxonomic revision of all genera belonging to Gentianaceae-Canscorinae, i.e., Canscora, Cracosna, Duplipetala, Hoppea, Microrphium, Phyllocyclus and Schinziella is presented, including keys to the taxa, distribution maps and seed coat descriptions. One new genus, one new species and seven new combinations are described. in total seven genera and 23 species are recognized. all taxa are of palaeotropical distribution with centres in india and Se asia.

The genus Phyllocyclus (Gentianaceae) in Thailand

“…Capsule oblong, ca 5 × 3 mm. Note.-Phyllocyclus petelotii is similar to P. parishii in having 5-merous flowers and a corolla > 10 mm long, but differs in having a cylindrical or tubular calyx (vs urceolate), the flowers in dichasia (vs monochasia) and with minute perfoliate prophylls at the base and along the lateral branches (vs none) (Thiv, 2003)…”

“…The genus Phyllocyclus Kurz (Gentianaceae) comprises five species distributed in Southern China, Laos, Myanmar, Thailand and Vietnam (Thiv, 2003). The genus was first described by Kurz (1873) but was later reduced to Canscora Lam.…”

“…A morphological cladistic analysis by and a molecular phylogenetic study by Struwe et al (2002) both led to the conclusion that Canscora is not monophyletic and suggested that Phyllocyclus be treated at generic rank. Thiv (2003), therefore, treated Phyllocyclus as a distinct genus with the five species P. helferianus Kurz, P. lucidissimus (H.Lév. & Vaniot) Thiv, P. petelotii (Merr.)…”