Paul, it doesn't appear to be a valid name, absent from IPNI.ORG, The Plant List, and Tropicos. Only 3 scoots starting with "z" seem to have been named:
Scutellaria zaprjagaevii Kochk. & Zhogoleva -- Izv. Akad. Nauk Tadzh. SSR, Biol. Nauk 1(102): 15 (1986). (IK)
Scutellaria zivari Akhmed-Zade -- Dokl. Akad. Nauk Azerb. SSR 36(
: 83 (1980). (IK)
Scutellaria zollingeriana Briq. -- Annuaire Conserv. Jard. Bot. Genève 1898, 104. (IK)
Then searching IPNI using wildcard for genus, and zhongdianensis for species (thus getting any plant with that species name), gives these 16 results, but no Lamiaceae
Apiaceae Pimpinella zhongdianensis C.Y.Wu -- Fl. Xizang. 3: 475 (1986). (IK)
Apiaceae Tongoloa zhongdianensis S.L.Liu -- Acta Phytotax. Sin. 27(1): 68 (1989). (IK)
Aristolochiaceae Aristolochia zhongdianensis J.S.Ma -- Acta Phytotax. Sin. 27(5): 339 (1989). (IK)
Asteraceae Artemisia zhongdianensis Y.R.Ling -- Bull. Bot. Res., Harbin 8(3): 1. 1988 (IK)
Bignoniaceae Incarvillea zhongdianensis Grey-Wilson -- New Plantsman 5(2): 96 (1998). (IK)
Brassicaceae Solms-laubachia zhongdianensis J.P.Yue, Al-Shehbaz & H.Sun -- Ann. Bot. Fenn. 42(2): 156 (-157; fig. 1). 2005
Caryophyllaceae Arenaria zhongdianensis C.Y.Wu -- Vasc. Pl. Hengduan Mount. 1: 404 (1993), without latin descr. or type;.
Caryophyllaceae Arenaria zhongdianensis C.Y.Wu -- et in Fl. Yunnan. 6: 835 (1995). 1993 (IK)
Convallariaceae Smilacina zhongdianensis H.Li & Yu Chen -- Acta Bot. Yunnan. 5(1): 77. 1983 (IK)
Hydrangeaceae Deutzia zhongdianensis S.M.Hwang -- Acta Bot. Austro Sin. 8: 18 (1992). (IK)
Papaveraceae Corydalis zhongdianensis C.Y.Wu -- Acta Bot. Yunnan. 18(4): 403, homonym. 1996 (IK)
Papaveraceae Corydalis zhongdianensis Z.Y.Su & Lidén -- Rheedea 5(1): 16 (1995). (IK)
Papaveraceae Corydalis zhongdianensis C.Y.Wu -- see Z.Y. Su & Lidén in Rheedea 5(1): 16 (1995). 1996 (IK)
Poaceae Poa zhongdianensis L.Liu -- Fl. Reipubl. Popularis Sin. 9(2): 405 (2002).
Rosaceae Rosa zhongdianensis T.C.Ku -- Bull. Bot. Res., Harbin 10(1): 1. 1990 (IK)
Scrophulariaceae Pedicularis zhongdianensis H.P.Yang -- Acta Bot. Yunnan. 6(3): 277. 1984 (IK)
