Acting on a tip-off, a joint checkpoint of police and Army was established at Chinal Dandu, a police officer said.
Two persons -- Farooq Ahmed Gujjar and Hussain Ahmed -- were questioned after their vehicle was stopped for checking yesterday and 20 kg Nag Chattri, botanically known as 'Trillidium Govanianum', was recovered from their possession, he said.
Both the accused have been arrested and an investigation is on, he said.