| Title | Argostemma wardii (Rubiaceae), a new species from Ayeyarwady Region, Myanmar |
| Author | Quan, Dong-Li |
| Publication | PHYTOTAXA |
| Year | 2025 |
| Volume | 718 |
| Issue | 3 |
| Corresponding Author | Tan, YH |
| Abstract | Argostemma wardii Y.H.Tan & D.L.Quan, a new species of Rubiaceae is described and illustrated from Ayeyarwady Region, southern Myanmar. This species is closely similar to A. kurzii but can be distinguished by its typically having 2-paired leaves that are thinly papery and spatulate, lanceolate, or elliptic in shape, with bases that are attenuate, cuneate, or asymmetrical. Additionally, A. wardii has larger stipules (5-15 x 10-30 mm vs. 1 x 2-5 mm), fewer inflorescences (1 or rarely 2 vs. 1-4), shorter peduncles (1.5-6.5 cm vs. 4-12 cm), a fleshy calyx (vs. chartaceous), subtle corolla venation (vs. conspicuous), and larger bracts (2-7 x 5-12.5 mm vs. 2-3.5 x 3-5 mm) and corollas (2 x 4-4.5 mm vs. 1.5 x 2-2.5 mm), along with longer corolla tubes (0.5-1 mm vs. 0.4-0.6 mm) and anthers (2-2.5 mm vs. 1 mm). |
