Key to the Hesperis species closely related to H. burdurensis

1. Siliqua hairy

2. Biennial, glands densely distributed along stem and siliqua, fruiting pedicel ca. 1 mm in diameter ............................... H. ozcelikii

2. Perennial, stem mostly canescent, trichomes 2–4–rayed, glands rarely present, fruiting pedicel 0.6–1 mm in diameter, siliqua asperous, trichomes 2–4–rayed, or simple mixed with glands..................................................................................... H. bicuspidata

1. Siliqua glabrous

3. Stem trichomes simple at base, pedicel glabrous or rarely with 2–4–rayed trichomes, fruiting pedicel 0.4–0.5 mm in diameter.. H. tosyaensis

3. Stem trichomes simple and 2–rayed or only 2–4–rayed at base, glands present, pedicel pubescent, fruiting pedicel 0.5–1 in mm diameter

4. Stem mostly canescent, trichomes densely 2–4–rayed, glands rarely present, pedicel and sepals with 2–3–rayed trichomes ........... ...................................................................................................................................................................................... H. bicuspidata

4. Stem trichomes simple and furcate, glands present, glands sometimes mixed with simple and 2–3–rayed trichomes on pedicel, glands mixed with simple and furcate trichomes on sepal

5. Stem with 2–4–rayed with sparsely simple trichomes, glands present in lower part, basal leaves entire, pedicel with 2–4–rayed with simple trichomes, glands present, petal 23–28 × 5–11 mm ................................................................................................ H. pisidica

5. Stem with simple and rarely bifurcate trichomes in lower part, glands present, basal leaves sinuate or remotely dentate, pedicel densely stalked glands, with simple, and rarely furcate trichomes, petal 18–22 × (2–) 3–4 mm ................................ H. burdurensis