The paper deals with the discovery of a new population of threatened taxa Catamixis baccharoides Thomson. The species is first time recorded from the state of Himachal Pradesh.

The present paper deals with some ethno-medicinally and socio-economically important plants used by the tribal inhabiting in and around the Singalila National Park. Systematic enumeration of 46 species, their uses and local name(s) has been provided.

Ipomoea laxiflora H.J.Chowdhery & M.R.Debta, a new species of the genus Ipomoea L., (Convolvulaceae) is described from Uttarakhand, India along with a photo plate.

Observations on the morphological variations in Androcorys josephi (Rchb.f.) Agrawala & H. J. Chowdhery (Orchidaceae) along with notes on its rare status are discussed.

The present paper is an attempt to document the data on invasive alien species occurring in Col. Sher Jung National Park, Sirmaur district, Himachal Pradesh along with their implications in conservation perspective. A total of 39 species belonging to 19 angiospermic families are enlisted as invasive alien species from the national park. The purpose of introduction of alien species also discussed along with their nativity.