琅琊榆 lang ya yu

Trees, to 20 m tall, d.b.h. to 50 cm, deciduous. Bark grayish brown, exfoliating in irregular oblong flakes. Branchlets densely pubescent when young, glabrescent, unwinged and without a corky layer. Winter buds ovoid; bud scales partly pubescent. Petiole 1-1.5 cm, densely villous; leaf blade broadly obovate, oblong-obovate, oblong, or oblong-elliptic, 6-18 × 3-10 cm, scabrous, abaxially densely pubescent, adaxially densely hirsute and pubescent along midvein, base oblique, margin doubly serrate, apex shortly caudate to caudate-acuminate; secondary veins 15-21 on each side of midvein. Inflorescences fascicled cymes on second year branchlets. Perianth glabrous, apically 4-lobed. Samara narrowly obovate, oblong-obovate, or broadly obovate, 1.5-2.5 × 1-1.7 cm, pubescent; stalk 1-2 mm; perianth persistent. Seed at center or toward apex of samara. Fl. and fr. Mar-Apr.

* 100-200 m. Anhui (Chuxian), Jiangsu (Jurong).

Species 13 through 19 share many characters in common, and differ in relatively minor characters. There has been much disagreement in the past about species delimitation in this group.