まぎらわしい生活型

植物の生活型に関する二三の問題点 II

抄録

1. Among several important problems concerning the field survey and statistics of biological types of plants, some cases difficult to judge a life-form to which a plant belongs are discussed in this report. Heretofore the identification of life-forms seems to have been done without much consideration as compared with that of species. To avoid such misjudgements, it will be most important that many individuals are compared and especially the underground parts of plants are examined.
2. In this report, ambiguous types of life-forms particularly concerning hemicryptophytes, chamaephytes, and geophytes as shown in Fig. A-G are discussed.
A) This is one of evergreen lianas, not climbing, and a creeping chamaephyte. The highest perennating buds are lateral buds (b in the left figure) on the creeping stem from which some adventitious roots grow (Fig. A).
B) An evergreen herb as a rosette-like hemicryptophyte. No terminal perennating bud is formed (Fig. B).
C) The highest perennating buds (b') wither in a short time. This seems to be a protohemicryptophyte as a rule (Fig. C).
D) A geophyte with an obliquely ascending rhizome. When a tuberous enlargement is near to the soil surface, it is apt to be misjudged as a hemicryptophyte (Fig. D).
E) A rhizome geophyte which is apt to be misjudged as a hemicryptophyte for their large scaly buds often appearing on the soil surface (Fig. E).
F) A tussock-like rhizome hemicryptophyte which is apt to be misjudged as a geophyte or chamaephyte (Fig. F).
G) A geophytic perennial herb. As the perennating bud on the basal portion of an aerial stem grows already in November to a rosette-like plant, it is apt to be mis judged as a hemicryptophyte or chamaephyte (Fig. G).