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- Title
Pollen morphology of Hosta Tratt. in China and its taxonomic significance.
- Authors
Liu, Jia-Xi; Zhao, Chun-Hai; Liu, Xiao-Rui; Xi, Yi-Zhen; Zhang, Yu-Long
- Abstract
In this study, pollen morphology of 11 taxa of Hosta in China , three Chinese species, five introduced species, and three cultivars, was observed by scanning electron microscopy (SEM) and compared with that of related genera ( Hemerocallis, Agave, and Yucca). Pollen grains of Hosta were long-ellipsoidal or ellipsoidal, 20-65 × 52.5-142.5 μm in size, bilaterally symmetrical, and monosulcate on the distal face. Reticulate and rugulate exine ornamentation was observed in different taxa, and the rugulate type can be further divided into rugulate, rugulate-baculate, and rugulate-granulate subtypes. The exine ornamentation may have evolved in the order: reticulate → rugulate → rugulate-baculate → rugulate-granulate. Furthermore, the rugulate exine ornamentation was the predominant ornamental type in Hosta except for one species with the reticulate type; this is markedly different from that of Hemerocallis, Agave and Yucca. Thus, our data support the proposal by Dahlgren and Clifford (The Monocotyledons: a comparative study. Academic Press, London, ) that these Hosta species constitute an independent family-Hostaceae.
- Subjects
CHINA; PLANT morphology; HOSTA; POLLEN; PLANT anatomy; EXINE; PLANT classification; SCANNING electron microscopy
- Publication
Plant Systematics & Evolution, 2011, Vol 294, Issue 1/2, p99
- ISSN
0378-2697
- Publication type
Article
- DOI
10.1007/s00606-011-0448-9