Leucanthemum ligusticum, Melai & Marchetti & Bernardello & Peruzzi, 2012

Melai, Martina, Marchetti, Dino, Bernardello, Remo & Peruzzi, Lorenzo, 2012, A new diploid species of Leucanthemum (Asteraceae, Anthemideae) from Liguria (northwestern Italy), Phytotaxa 66 (1), pp. 27-37 : 31-33

Key to Leucanthemum ligusticum and related diploid taxa

1. Basal leaves entire (at most with conspicuous lobes and teeth) .................................................................................. 2.

- Basal leaves dissected.................................................................................................................................................. 3.

2. Cypselae less than 2 mm long, those of ray florets with scarious pappus at most half of the fruit length (widespread range) ................................................................................................................................... Leucanthemum vulgare s.l.

- Cypselae more than 2 mm long, those of ray florets with scarious pappus more or less equalling the fruit length (southern Italy) ..................................................................................................................... Leucanthemum laciniatum

3. Phyllaries with pale or light brown margins, basal leaves rarely pinnatifid (northeastern Spain) ................................. ......................................................................................................................... Leucanthemum vulgare subsp. pujiulae

3. Phyllaries with brown margins, basal leaves pinnatifid .............................................................................................. 4.

4. Teeth of basal leaves ≤ 2 mm long, plants at most 40(50) cm tall, growing above 1000 m a.s.l. (northern Spain) ....... ................................................................................................................. Leucanthemum gaudinii subsp. cantabricum

4. Teeth of basal leaves generally ≥ (1.8) 2 mm, plants up to 100 cm tall, growing under 1000 m a.s.l. ....................... 5.

5. Basal leaves (9) 10–17.5 mm wide, with (12)13–16(17) teeth (northeastern Spain and central and southern France) .. ......................................................................................................................................... Leucanthemum monspeliense

- Basal leaves (18)22–41(58) mm wide, with (14)22–72(78) teeth ............................................................................... 6.

6. Lower cauline leaves with petioles (13)16–21(22) mm and teeth (2.7) 2.8–4.3 mm long, disk florets (3.1)3.8–4.6(5.0) mm long (northwestern Spain, Galicia and Asturias) ............................. Leucanthemum pluriflorum

- Lower cauline leaves with petioles (15)20–41(49) mm and teeth (1)1.5–2.7(3) mm long, disk florets less than 3 mm long (northwestern Italy) ....................................................................................................... Leucanthemum ligusticum