1. The author experimentally ascertained a heterogenous habitat segregation due to the soil moisture between
Aster subulatus and three species of
Erigeron,
E. sumatrensis,
E. canadensis and
E. bonariensis, both of which belong to the same life form and growing period.
2. The main growing range of
A. subulatus is usually connected with higher
soil moisture, but there is found a few individuals of
A. subulatus accompaning in the community of
Erigeron spp. which grows in drier habitat. The root form of
A. subulatus in the
Erigeron community shows a straight root form (
S) as well as in the three species of Erigeron. On the other hand, the root form of
A. subulatusin its pure community shows a reticulate form (
Re) or branched root form (
Br).
3. As to the anatomical features of root of
A. subulatus from both communities, the pure communities of
Aster and
Erigeron, differences are clearly found in
Ct-Q., presence of intercellular space, largest vessel diamter, etc., and the author recognized a homogenous habitat segregation between individuals of
A. subulatus. Among the plants of
Erigeron spp. were not found so notable differences as in
Aster subulatus.
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