水田雑草ミズアオイの幼植物の形態および開花,種子生産の特性について : コナギとの比較
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概要
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Recently. Monochoria korsakowii has been recognized as one of the harmful lowland weeds in northern part of Japan. This weed resembles M. vaginalis var. plantaginea, especially in its early growth stage. Then, the seedlings of two species were comparised in order to discriminate them in this stage. Furthermore, habitats of flowering and seed production of Morsakowii were observed. Following results were given. 1. Morphological differences between two species in the stage from emergence to 6 leaf stage were found at the following two points. a : Seed coat on the top of cotyledon of M. korsakowii was larger (about 1.5mm) than that of M vaginalis var. plantaginea (about 1.0 mm). b : The position of maximum leaf width was found at the base in M, korsakowii, while in M, vaginalis var. plantaginea, it was found at 1 /2〜1/3 from the base of leaf. 2. The key to determination of Pontederiaceae weeds in Japan was made for their seedlings till about 4 leaf stage. The key includes the following 4 species, Eichhornia crassipes, Heteranthera limosa, Monochoria vaginalis var. plantaginea, and M. korsakowii. 3. It was suggested that M, vaginalis var. plantaginea had not yet gained ecological adaptability to cool region, because it seemed to be difficult for this species to perform its annual life cycle in the period of frost free at this region. 4. The component of seed production of M. korsakowii was given as following values on the average. 1. 6 inflorescenses per plant, 3. 8 capsules per inflorescens, 54. 7 seeds per capsule. Then, about 330 seeds were produced by averagely growing plant.
- 日本雑草学会の論文
- 1982-05-26
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