Allium shinasii (Amaryllidaceae) is described here as a new species. Diagnostic morphological characters, a full description, and detailed illustrations are given herein. Allium shinasii is known from Tunceli province in eastern Anatolia, Turkey. According to its morphological features, it belongs to Allium sect. Codonoprasum. It is related to A. kurtzianum that belongs to the same section, A. sieheanum and A. sivasicum that belong to A. sect. Scorodon. However, it is easily distinguished from these species mainly by tepals, leaves and spathe characters.

Karyological studies were done on root tips were pretreated with 0.05% 1-bromonaphthalene in water solution (Elçi 1982) at +4°C for 17 h and fixed in Carnoy solution (1 part glacial acetic acid: 3 parts 95% or absolute ethanol) 24 h. Root tips were hydrolyzed for 20–25 min in 1 N HCl at room temperature, then stained 30 min in 4% Hematoxilin (Guerra 1999). Stained meristems were squashed in a drop of 45% acetic acid.