Taxonomic notes on Euphorbia himalayensis (Klotzsch) Boiss. and allied species (Euphorbiaceae)

Abstract

Euphorbia himalayensis (Klotzch) Boiss. E. luteo-viridis Long and E. Wallichii Hook. f. are closely related species and are often confused. Critical studies of the collections in the various herbaria of the Botanical Survey of India reveal that the identifications are muddled and that Indian specimens labelled as E. himalayensis are either E. luteoviridis or E. wallichii. Our studies reveal that E. himalayensis does not occur within the present political boundaries of India. In an effort to clear the confusion, a key to the species involved, their detailed descriptions and illustrations are provided here.