Botanical Name – Parthenium hysterophorus L.

Family – Asteraceae

Common Name – Congress Grass, Carrot Grass

A native of American tropics, responsible for reduced crop production due to its allelopathic effects. It causes itching, puffy eyes, respiratory problem in humans.

Botanical Name – Lantana camara L.

Family – Verbenaceae

Common Name – Lantana

A native of American tropics reduces agricultural productivity by produces allelopathic substances that impact adversely the growth of crop plants. Unripe fruit of this plant poisonous to livestock and human beings. It can out compete native species leading to a reduction in biodiversity.

Botanical Name – Cuscuta reflexa Roxb.

Family – Amar Bail, Akash Bel

Common Name – Convolvulaceae

A native of Indian subcontinent and parasitic plant can spread plant disease from one host to another. It can also decrease the ability of host plants to resist diseases. Agriculturalist considers Cuscuta a destructive weed.

Botanical Name – Datura innoxia Mill.

Family – Solanaceae

Common Name – Datura, Thorn apple

A native of American continent contains dangerous levels of terpene alkaloids. Flowers and seeds can cause respiratory depressions, hallucinations, psychosis and sometimes death if taken internally.

Botanical Name – Argemone mexicana L.

Family – Papaveraceae

Common Name – Mexican prickly poppy

A native of Mexico naturalized elsewhere poisonous, to grazing animals. Seeds of this plant contain harmful oils. In India adulteration of Argemone seed oil with mustard oils caused epidemic ‘Dropsy’ with symptoms like swelling of body and kidney problems.

Botanical Name – Calotropis procera (Aiton) W. T. Aiton

Family – Apocynaceae

Common Name – Madar, Crown Flower

A native of North Africa, Tropical Africa and Asia. The milky Juice of this plant causes vision loss and irritation to skin. When this plant taken orally it causes pain in stomach, vomiting, diarrhea and dilated pupils.

Botanical Name – Nerium oleander L.

Family – Apocynaceae

Common Name – Kaner, Nerium

A native of Northwest Africa, Arabian peninsula and Southern Asia. Ingestion of this plant may cause vomiting, abdominal pain, bloody diarrhea, dizziness, weakness and visual disturbances.

Botanical Name – Riccinus communis L.

Family – Euphorbiaceae

Common Name – Castor Oil Plant, Arandi

A native of Tropical Africa. The seeds of this plant contains poisonous compound Ricin. Ingestion of the castor seed causes abdominal pain, vomiting, diarrhea. The sap of castor plant causes skin rashes.

Botanical Name – Cannabis sativa L.

Family – Cannabaceae

Common Name – Bhang

A native of Eastern Asia. The Plant is narcotic and intake of this plant causes nausea, vomiting, hallucination and drowsiness.