Lysimachia brevianthera (Primulaceae), a New Species from the Daba Mountains in Hubei and Shaanxi, China

Here, we describe an unusual new species, Lysimachia brevianthera X.W. Li, in Lysimachia subgen. Idiophyton from China. It has the filaments longer than the basifixed anthers, at the base fused into a narrow ring connate with the corolla; leaves congested at the upper part of the stem; and grayish black capsules. Lysimachia brevianthera is similar to L. laxa in having a winged stem and the free part of filaments longer than 2 mm, but differs from it by the unbranched stems (vs. many branched stems), larger flowers and grayish black capsules (vs. light brown capsules). A phylogenetic analysis supports the placement of L. brevianthera in subgen. Idiophyton.