Persicaria (Linnaeus) Miller

Li, Bo, 2014, Persicaria wugongshanensis (Polygonaceae: Persicarieae), an odoriferous and distylous new species from Jiangxi, eastern China, Phytotaxa 156 (3), pp. 133-144 : 142

Diagnostic key of the taxa studied

1. Leaves with peppery taste; flowers monomorphic...................................................................................... P. hydropiper

- Leaves without peppery taste; flowers dimorphic ........................................................................................................ 2

2. Inflorescences uninterrupted; flowers small; tepals without glandular dots ...................................................................... P.jucunda

- Inflorescences usually interrupted at base; flowers large; tepals densely or sparsely golden punctuate ......................................... 3

3. Plants without special odor; stems, leaves and ocreae densely or sparsely appressed ...................................................... P. japonica

- Plants intensely odoriferous (just like Houttuynia Thumb. ); stems, leaves and ocreae glabrous or pubescent................................ 4

4. Perennial herbs with developed rhizomes; leaf blades lanceolate or narrowly lanceolate, both surfaces glabrous or nearly glabrous; ocreae glabrous; achenes shiny, smooth .................................................................................................................. P. odorata

- Annual herbs; leaf blades ovate or ovate-lanceolate, rarely broadly lanceolate, both surfaces sparsely pubescent; ocreae densely pubescent; achenes opaque, densely pitted .......................................................................................................... P. wugongshanensis