Elatostema section Weddellia series Xingyiensia L.D.Duan & D.H.Yin, ser. nov.

Yin, Dan-Hong, Huang, Teng-Fei, Lu, Zhen & Duan, Lin-Dong, 2021, A new species and a new series of Elatostema (Urticaceae) from south-western China, PhytoKeys 180, pp. 65-71 : 65

Elatostema section Weddellia series Xingyiensia L.D.Duan & D.H.Yin, ser. nov.

Diagnosis.

Mid-vein impressed, margin revolute, pistillate inflorescence peduncle dichotomously branched. Typus seriei: Elatostema xingyiense L.D. Duan & D.H. Yin.

Relationship.

The staminate capitula of the species is long peduncelate, as such this new series is closely related to ser. Elatostema Sublinearia W.T. Wang ( Wang 1980). It also has similarity to ser. Elatostema Melanocarpa W.T. Wang with its achene fawn, ovoid, longitudinally 4(-5)-ribbed and tuberculate ( Wang 2013). However, the new series differs from these two series with regards to the following features: leaf mid-vein impressed, the margin revolute (compared to the mid-vein flat and margin flat in ser. Elatostema Melanocarpa and ser. Elatostema Sublinearia ); pistillate inflorescence peduncle dichotomously branched (compared to the peduncle not dichotomously branched in ser. Elatostema Melanocarpa and ser. Elatostema Sublinearia ) (Table 1 ).