Blue ginger
This plant can grow 1 to 2 m in height.  It bears a raceme at the tip of the stem, and many dark violet flowers bloom on it.  The flower accompanies the bract which is conspicuous during its bud stage.
The flower blooms upwards and shows trimerous symmetry same as the flower of the Liliaceae family.  It has 3 petals, 3 sepals, 6 stamens, and one pistil.  The stamens characterize this flower, and 2 on the lower side of 6 expand long, their attached places are different, and bend outwards.  The one at the center of the lower side is a little longer and bends downwards a little.  The fact that the stamens have 3 different forms is the same as Commelina communis and Commelina benghalensis.
The stem has the node, and the leaf grows from it and the part of its base forms leaf sheath to wrap the stem.  Some part of stem near the base is dark violet and has light green vertical short lines, which sometimes looks like hairy.
The appearance such as the stem, the leaf, and the way of blooming resemble red ginger however the flowerfs color is characteristic dark violet, so the English name became Blue ginger.
The flower of Commelina communis and Commelina benghalensis is self-pollinating but is about 10 % cross pollinating as well.  It has 6 stamens but 3 of them are a staminodium and their filaments are one third shorter than central opposit filament.  The anther has an X-shape, and releases a small amount of pollen despite being sterile.  It has a role which attracts insects with the yellow color which is good contrast with the dark violet of the petals.  The stamen located at the center of the lower side has a Y-shaped anther, and its filament is twice as long as the filament on each side of it, and releases some pollen and contributes to pollination.  The 2 stamens along both sides of the lower part have O-shaped anthers and conduct pollination.
Classification: Commelinaceae Dichorisandra
Scientific name: Dichorisandra thyrsiflora
Japanese name: Kodachi-murasakitsuyukusa
English Name: Blue ginger
Native locality: Brazil
Ecological description: Non-hardy perennial
RDB : ---
Planting place: Aquatic Plant Greenhouse and Hawaiian Greenhouse
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