Zingiber species

Leong-Škorničková, Jana, Bình, Nguy ễn Qu ốc, Đăng, Tr ần H ữu, Šída, Otakar, Rybková, Romana & Vương, Trương Bá, 2015, Nine new Zingiber species (Zingiberaceae) from Vietnam, Phytotaxa 219 (3), pp. 201-220 : 219

Key to terminally flowering Zingiber species (sect. Dymczewiczia) in Vietnam

1. Inflorescence hanging down...............................................................................................................................................................2

1. Inflorescence erect..............................................................................................................................................................................5

2. Leaf sheaths glabrous.........................................................................................................................................................................3

2. Leaf sheaths pilose or pubescent........................................................................................................................................................4

3. Inflorescence ovoid, bracteoles c. 18 × 7 mm, labellum emarginate, dark purple, almost black, calyx c. 16 mm long...................... ................................................................................................................................................................................. Z. atroporphyreus

3. Inflorescence narrowly fusiform, bracteoles 4–10 × 2–4, labellum entire, bright to dark red, calyx c. 12 mm long .......................... .................................................................................................................................................................................. Z. cardiocheilum

4. Laminae elliptic, bracts densely pubescent throughout, lateral staminodes well-developed petaloid, elliptic .................. Z. pellitum

4. Laminae narrowly elliptic, bracts glabrous or with pilose margin, lateral staminodes small, linear ........................... Z. rufopilosum

5. Bracts not recurved at apex................................................................................................................................................................6

5. Bracts recurved at apex .................................................................................................................................................. Z. castaneum

6. Lamina somewhat leathery with no prominent plication, ligules thick, dark maroon, labellum dark maroon-brown, with minute yellow streaks broadly trullate, flat ........................................................................................................................................ Z. mellis

6. Lamina thin, prominently plicate, ligules thin, green, labellum peach-purple to purple, with cream white or pale yellow lines radiating from the base, margins reflexed .................................................................................................................................. Z. plicatum