Genus Homaliodendron Fleisch.

KEY TO HOMALIODENDRON SPECIES IN CHINA

1. Capsules immersed ........................................................................................................ H. neckeroide s Broth.

— Capsules exserted ........................................................................................................................................ 2

2. Stipe leaf apices rounded-obtuse .................................................... H. montagneanum (Müll. Hal.) M.Fleisch.

— Stipe leaf apices acute or narrowly obtuse .................................................................................................... 3

3. Upper cells of stem leaves long rhomboid .................................................................................................... 4

— Upper cells of stem leaves rounded, quadrate to hexagonal .......................................................................... 5

4. Branch leaves nearly similar in width throughout, acute or narrowly obtuse at the apex ................................. ................................................................................................................... H. ligulifolium (Mitt.) M.Fleisch.

— Branch leaves usually wider at the base, acute at the apex ....................... H. scalpellifolium (Mitt.) M.Fleisch.

5. Branch leaf cells more or less distinctly mammillose ...................................................... H. papillosum Broth.

— Branch leaf cells smooth .............................................................................................................................. 6

6. Costae single, strong or slender ................................................................................................................... 7

— Costae absent or short and double ............................................................................................................... 9

7. Branch leaves with the same width from base to upper, costae slender ......................................................... 8

— Branch leaves with the base broader than the apex, costa strong .................................. H. crassinervium Thér.

8. Stipe leaves appressed, seta 2.5-4 mm ............................................................ H. flabellatum (Sm.) M.Fleisch.

— Stipe leaves spreading, seta longer than 1.5 cm ............. H. fruticosum (Mitt.) S.Olsson, Enroth & D.Quandt

9. Branch leaf margins irregularly dentate at the apex, and costae double, short, sometimes indistinct or absent ........................................................................................................................... H. pulchrum L.Y.Pei & Y.Jia

— Branch leaf margins strongly, irregularly biserrate teeth at the apex and costae distinctly double ..................... ................................. H. maolanense J.Yang, F.M.Lei, R.L.Huang, Y.C.Zhang, L.He, J.Yu & D.D.Li, sp. nov.