(Upload on November 3 2016) [ 日本語 | English ]

Datura stramonium L.

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Datura L. (チョウセンアサガオ)
Youshu-chousen-asagao (ヨウシュチョウセンアサガオ, 洋種朝鮮朝顔), Jimson weed or Devil's snare
Lifeform: erect, annual forb, becoming 1.5 m tall
Distribution: widespread in tropical and temperate regions in the world

exotic to Japan (introduced in ca. 1870)

Habitat: roadsides, waste lands, abandoned pastures, etc.
Body: hairless
Flower: pale violet ↔ D. metel: white
Fruit (capsule): oval ↔ D. metel: spherical
Poisons: tropane alkaloids (sometimes used as medicine)
Seed: black; dispersed by self, animal, wind and rain
Chromosome number: 2n = 24

Datura tatura L.
Datura stramonium L. var. tatura (L.) Torr.
Datura stramonium L. var. chalybea W. D. J. Koch, sometimes used

var. inermis (Juss. ex Jacq.) Schinz et Thell. (トゲナシチョウセンアサガオ), without spines on the fruits
f. stramonium (シロバナチョウセンアサガオ), white flower
f. tatura (L.) Dabert. (ヨウシュチョウセンアサガオ, s.s.)

Datura stramonium in Hokkaido

[1-3] in a waste land near Muroran Marine Station, Muroran City, on September 12 2016.