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{{stub}}[[File:Biennial henbane 2nd year.JPG|right|thumb|Henbane]]'''Pārasīkayavānī''' consists of the seed of Hyoscyamus niger Linn. (Fam. Solanaceae), It is an annual or biennial herb, . It is native to the Mediterranean region and temperate Asia, occurring in Western Himalayas from Kashmir to Kumaon at an altitude of 1600 to 4000 m, imported into India.

The chief constituent of Henbane leaves is the alkaloid Hyoscyamine, together with smaller quantities of Atropine and Hyoscine, also known as Scopolamine. The proportion of alkaloid in the British Pharmacopoeia dried drug varies from 0.045 to 0.14 per cent. Higher yields are exceptional. The amount of Hyoscyamine is many times greater than that of Hyoscine.<ref name="chemical composition"/>

{{Common names|kn=|ml=ಖುರಾಸಾನಿ ಓಮ Khuraasaani oma, ವಿಲಾಯತಿ ತುಳಸಿ Vilaayati tulasi|sa=|ta=|te=Parseek yawani|hi=Khurasani ajwain|en=Henbane, Stinking nightshade}}<ref name="Common names"/>

{{Flower|Unisexual|2-4cm long|pinkPink||Flowering throughout the year and In terminal and/or axillary pseudoracemes}}

{{Fruit|oblong Oblong pod|Thinly septate, pilose, wrinkled|||seeds Seeds upto 5|Fruiting throughout the year}}

By the walls of fields, waste ground, near buildings and in stony places from low-lying ground near the sea to lower mountain slopes.Best propagated from seeds <ref name="How to plant/cultivate"/>

{{Commonly seen|Cultivated beds}}, {{Commonly seen|Walls of fields}}, {{Commonly seen|Waste ground}}, {{Commonly seen|Stony places}}, {{Commonly seen|Lower mountain slopes}}.

<ref name="chemical composition">[https://botanical.com/~botanid5/botanical/mgmh/h/henban23.html "Chemical composition"]</ref><ref name="Leaf">[ "Morphology"]</ref><ref name="How to plant/cultivate">[https://pfaf.org/User/Plant.aspx?LatinName=Hyoscyamus+niger"Cultivation detail]</ref> <ref name="Common names">[http://www.flowersofindia.net/catalog/slides/Henbane.html Local names]</ref>