Duckweed

Duckweed
Duckweed
Classification
界 : Plant kingdom Plantae There is no rank : Angiosperm angiosperms There is no rank : Single cotyledon monocots Eyes : Sagittaria trifolia eyes Alismatales Course : Taro department Araceae Subfamily : Duckweed subfamily Lemnoideae The genus : Duckweed genus Lemna Kind : Duckweed L. aoukikusa
Scientific name
Lemna aoukikusa T.Beppu et Murata[1]
Synonym
Lemna paucicostata

The waterweed that the duckweeds (Lemna aoukikusa) are classified in the duckweed genus. With a floating plant, I grow in colonies on the surface of the water of a lake and the rice field.

Table of contents

Distribution

I am distributed over wetlands or the rice field of the all over Japan and form stock with duckweed [²].

Form, habits

The plant body does the form that several fronds affected and stretches out one root from the second frond underwater. 2-6mm, the leaf vein have the size more than three of them. Is white at bottom; 1-4cm [²]. The coleorhiza in the base of the root has a wing.

I often increase for idleness in a vegetation propagation, but produce the flowers. I form the flower which is not outstanding having two stamens and pistil one for from August to October in flowering season [²]. The seed is ecru; the size 0.3-0.5mm [²]. For the winter season, I winter with an elliptic frond (1-2mm) produced for a seed or dormancy [²]. The seed germinates in about April.

The chromosome number 2n=40, 50, 70 [²].

Classification

The duckweed distributed over Japan had been ever treated as one kind Lemna paucicostata, but the opinion that you should subdivide was shown in two kinds of 1 subspecies in this for the cause in studies such as the RFLP [³]. When a form, the habits, a duckweed (Lemna aoukikusa) distributed over Japan from the differences of the enzyme widely, ホクリクアオウキクサ (L. aoukikusa ssp. hokurikuensis) distributed only over the Hokuriku district, two kinds of 1 subspecies of ナンゴクアオウキクサ (L. aequinoctialis) to be distributed over south were distributed over Japan, in the study, I did it.

However, an opinion to be synonym of ナンゴクアオウキクサ in duckweed and ホクリクアオウキクサ in the first place admit as a kind only with one kind of little duckweed (L. perpusilla) without subdividing a kind, and there is the claim doing for two kinds of 1 subspecies all synonym such as duckweeds.

Close species

A form is similar to a lot of of the duckweed genus including young bird duckweed, the co-duckweed very much. Because the leaf vein of the frond is one of them, I can distinguish the young bird duckweed from a duckweed, and a coleorhiza of the co-duckweed can distinguish it because there is not a wing [⁴].

Footnote

1. ^ Koji Yonekura, Tadashi Kajita (2003-). "Lemna aoukikusa". BG Plants Japanese name - scientific name index (YList). October 30, 2014 reading.
2. ^ ^{a b c d e f} Sueo Otaki, Tadashi Ishido "Japanese aquatic pictorial book of flora" 北隆館, 1980. p.133
3. ^ Toshio Beppu, Daisuke Yanase, field edge plus, Gen Murata (1985) "reexamination plant classification of duckweeds from Japan", geography 36 (1-3), 45-58
4. ^ Yasuro Sumino "Japan waterweed illustrated book" Bunichi general publication, 1994. p.167

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