Geranium sect. Unguiculata

Wagensommer, Robert Philipp & Venanzoni, Roberto, 2021, Geranium lucarinii sp. nov. and re-evaluation of G. kikianum (Geraniaceae), Phytotaxa 489 (3), pp. 252-262 : 258

Key to the species of Geranium sect. Unguiculata

1. Petals with deflexed limb and claw less than 1 mm wide at the broadest part. Sepal mucro 2.0– 2.5 mm long .............. G. kikianum

1+ Petals with patent-spreading limb and claw more than 2 mm wide at the broadest part ...................................................................2

2. Lamina of basal leaves 2.0– 3.6 cm long; segments 3- to 5(6)-lobed in distal half; sepal mucro 0.7–1.9 mm long .... G. dalmaticum

2+ Lamina of basal leaves 4.3–10.8 cm long; segments (8)10- to 34-lobed in distal half; sepal mucro (1.4–) 2–4.2 mm long .............3

3. Sepal mucro (1.4–) 2–3.2 mm long; basal leaves persistent or deciduous, with segments rarely overlapping on the margin ............. .................................................................................................................................................................................. G. macrorrhizum

3+ Sepal mucro 3.0– 4.2 mm long; basal leaves always persistent, with segments often overlapping on the margin ........... G. lucarinii