190
3.34 Ligularia tongolensis (Franchet) Handel-Mazzetti
Ligularia tongolensis is close taxonomically to L. cymbulifera and is distributed
from northwestern Yunnan to southwestern Sichuan (Plate 28). Initially, we collected 19 samples in these areas, but no intraspecific diversity was observed among
them by TLC analysis. Five of these (samples 1–5) were investigated further, and
the furanoeremophilan-15,6-olides 215, 220, and 224 and the furanoeremophilan15-oic acids 206 and 210 were isolated [48] (Table 42). Subsequently, the related
compounds 204, 207, 208, and 219 were also generated from samples 6–14 [128,
137]. Tetradymol (225), a bisabolane 647, and eudesmane 789 were also obtained
[137]. The ability to produce tetradymol may be acquired from L. cymbulifera by
hybridization [137]. In addition, Han et al. isolated the eremophilane-(12,8)
(15,6)-bisolides 498, 503, and 504, and the other sesquiterpenoids 794 and 810
(sample 15) [206, 207]. The triterpenoids 849 and 850 [207, 251] and a monoterpenoid 866 [207] were also isolated. The intraspecific diversity found among L. tongolensis samples proved to be quite small, and their chemical constituents are
similar to those of L. cymbulifera.
Plate 28 Photograph of
L. tongolensis
M. Tori and C. Kuroda
3.34 Ligularia tongolensis (Franchet) Handel-Mazzetti
Ligularia tongolensis is close taxonomically to L. cymbulifera and is distributed
from northwestern Yunnan to southwestern Sichuan (Plate 28). Initially, we collected 19 samples in these areas, but no intraspecific diversity was observed among
them by TLC analysis. Five of these (samples 1–5) were investigated further, and
the furanoeremophilan-15,6-olides 215, 220, and 224 and the furanoeremophilan15-oic acids 206 and 210 were isolated [48] (Table 42). Subsequently, the related
compounds 204, 207, 208, and 219 were also generated from samples 6–14 [128,
137]. Tetradymol (225), a bisabolane 647, and eudesmane 789 were also obtained
[137]. The ability to produce tetradymol may be acquired from L. cymbulifera by
hybridization [137]. In addition, Han et al. isolated the eremophilane-(12,8)
(15,6)-bisolides 498, 503, and 504, and the other sesquiterpenoids 794 and 810
(sample 15) [206, 207]. The triterpenoids 849 and 850 [207, 251] and a monoterpenoid 866 [207] were also isolated. The intraspecific diversity found among L. tongolensis samples proved to be quite small, and their chemical constituents are
similar to those of L. cymbulifera.
Plate 28 Photograph of
L. tongolensis
M. Tori and C. Kuroda