FIGURE 7 in A preliminary study of the morphological variation of rhizomes in Zingiber Mill. and its role in taxonomy

FIGURE 7. Rhizomes of representative species of Zingiber, showing different shapes of rhizome units. A. Zingiber tenuifolium L.Bai et al. (vegetative rhizome units broadly cylindrical to broadly obovoid, base and apex slightly narrowed, flowering rhizome units similar in shape and slightly smaller). B. Presumed hybrid between Z. densissimum S.Q.Tong & Y.M.Xia and Z. yunnanense S.Q.Tong & X.Z.Liu, showing vegetative rhizome units comprise a cylindrical pseudo-neck and an obovoid head, flowering rhizome units thinner, cylindrical or narrowly obovoid. C & D. Z. tuanjuum Z.Y.Zhu (two populations, vegetative rhizome units comprise a short- or long-cylindrical pseudoneck and a broadly obconical or broadly obovoid head, flowering rhizome unit thinner, cylindrical); also show that flowering rhizome unit (a) further produce daughter flowering rhizome unit (b) and that the base of aerial shoots (around the abscission zone) are swollen and semi-transparent (blue arrow). E. Z. integrilabrum Hance (vegetative rhizome units comprise a long-cylindrical pseudo-neck and an obovoid head, flowering rhizome units long-cylindrical). Flowering rhizome units that can be identified with certainty in A–E are marked with red arrows. Some root tubers are marked with green arrows. Scale bars = 1 cm. Photos: Lin Bai.