Abstract
Ottelia fengshanensis, a new species (Hydrocharitaceae) from southwest China is here described and illustrated. Comparing its morphological features to putative close relatives O. guanyangensis, it has 3–4 flowers (vs. 2–5) each spathe, hexagonal-cylindric fruit, white styles (vs. yellow), green leaves (vs. dark green) and fruit tiny winged (vs. winged obviously). Molecular phylogenetic investigation of four DNA sequences (ITS, rbcL, trnK5’ intron and trnS-trnG) and the Poisson Tree Processes model for species delimitation (PTP) analysis, further resolves O. fengshanensis as a new species that is close to O. guanyangensis with distinct support.
Highlights
Ottelia Persoon (1805:1) has about 22 species and is widely distributed in the tropical, subtropical and temperate regions
From the Fengshan County, we found once again a species with bisexual flowers which generally appeared to be like O. balansae
For O. alismoides, there is only one flower in each spathe and it is easy to distinguish from the new species
Summary
Ottelia Persoon (1805:1) has about 22 species and is widely distributed in the tropical, subtropical and temperate regions. In 2017–2018, we found and reported a new bisexual species O. guanyangensis in Guilin City, China (Li et al 2018). From the Fengshan County, we found once again a species with bisexual flowers which generally appeared to be like O. balansae.
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