Lactuca rosularis, Boissier, 1875

Doostmohammadi, Moslem & Kilian, Norbert, 2017, Lactuca pumila (Asteraceae, Cichorieae) revisited-additional evidence for a phytogeographical link between SE Zagros and Hindu Kush, Phytotaxa 307 (3), pp. 133-140 : 139

Key to the species of the Lactuca rosularis group

1. Rosette leaves lyrately or irregularly pinnatifid to pinnatisect with large terminal lobe; achenes with smooth epidermis and whitish filiform beak at least ½ as long as corpus ....................................................................................................................... L. rosularis

– Rosette leaves undivided; achenes either with wrinkled epidermis or with smooth epidermis but then beak much shorter ........... 2

2. Involucre 10–12 mm long; achene corpus (without beak) 4–5 mm and pappus 5–6 mm long ... .................................. L. denaensis

– Involucre 6–9(–10) mm long; achene corpus (without beak) 2.3–3.2 mm and pappus 2.5–3.5 mm long ....................................... 3

3. Involucre 6–7 mm long; anther tube (fertile part) 1.6–2 mm long; achene with smooth epidermis, corpus distally with transversal constriction, beak 0.3–0.5 mm long .......................................................................................................................... L. hazaranensis

– Involucre 7–9 mm long; anther tube (fertile part) 2.6–2.8 mm long; achenes with distinctly wrinkled epidermis, corpus without transversal constriction, beak 1.2–1.4 mm long ................................................................................................................. L. pumila