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Cicuta bulbifera
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Cicuta bulbifera : ウィキペディア英語版
Cicuta bulbifera

''Cicuta bulbifera'', commonly known as the bulb-bearing water-hemlock, is a plant native to North America and one of four species in the poisonous genus ''Cicuta''. Tiny bulbils form in the leaf joints in the upper part of the plant, giving the plant its scientific and common names. 〔(【引用サイトリンク】title=''Cicuta bulbifera'' (Bulblet-bearing Water Hemlock) )〕 ''Cicuta bulbifera'' can be distinguished from ''Cicuta douglasii'' by its narrow leaflet segments (less than 1/4 of an inch wide) and its bulbil-bearing upper leaf axils.〔(【引用サイトリンク】title=''Cicuta bulbifera'' L. )
==Morphology==
This native perennial plant reaches tall with limited branching. The stems are light green to slightly reddish, glabrous, and glaucous from epicuticular wax. The compound, alternate leaves are green, also glaucous (excluding petioles), and up to , becoming smaller as they ascend the stems. Lower leaves are bipinnate, while the upper leaves are often simple-pinnate. The petioles of the lower leaves are long, but those of the shorter leaves are much shorter or even absent. Leaflets (pinnae) are up to long and across; they are linear to lanceolate-linear, dentate, and sometimes cleft into narrow lobes. The axils of the upper leaves often have sessile clusters of ovoid bulbils, capable of giving rise to new plants. The root system consists of a cluster of elongated fleshy roots.
The stems terminate into compound umbels of small white flowers, each of which spans about across and comprises about 8 umbellets, themselves each composed of some 16 flowers. The entire inflorescence is bractless, although a small sessile leaf may occur near the base of it. Flowers are about across and consist of 5 white petals, 5 stamens, 2 styles, and an ovary. The blooming period occurs during late summer to early fall and lasts about a month. There is no noticeable floral scent. Each seed is contained in a fruit of the same size as the original flower that is somewhat flattened, egg-shaped, and slightly notched at its apex.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Cicuta bulbifera」の詳細全文を読む



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