FIGURE 9 in A preliminary study of the morphological variation of rhizomes in Zingiber Mill. and its role in taxonomy

FIGURE 9. Rhizomes of representative Zingiber species, showing rhizome units with different directions of growth. A. Zingiber sp. 1, rhizome units appear nearly vertical; note that this collection was from plants growing near a watercourse, the rhizome on the left is distorted probably by the action of water, while the rhizome units on the right are aligned in a vertical plane. B. Two species with rhizome units curve upwards gradually. Upper: Z. sp. 2. Lower: Z. atrorubens Gagnep. C–D. Z. atroporphyreum Škorničk. & Q.B.Nguyễn, showing rhizome units initially growing downwards for some distance before turning upwards. E–F. Z. leptorrhizum D.Fang, showing horizontal rhizome units. Scale bars = 5 cm. Photos: Lin Bai.