1.

+  

Capitula arranged in corymbose panicle.

2

–

Capitula arranged in simple raceme or cylindrical or pyramidal panicle or paniculate spike or raceme.

3

2.

+

Cauline leaves with winged petiole. Pappus bristles pale brown.

9. L. amplexicaulis

–

Cauline leaves with unwinged petiole. Pappus bristles white.

1. L. thomsonii

3.

+

Capitula arranged in cylindrical or pyramidal panicle or paniculate spike or raceme.

4

–

Capitula arranged in simple, elongated or conical raceme.

5

4.

+

Phyllaries uniseriate, oblong-ovate.

4. L. afghanica

–

Phyllaries biseriate, outer ones oblanceo-late; inner ones obovate.

7. L. macrophylla

5.

+

Plant 20-40 cm tall. Leaves entire.

2. L. alpigena

–

Plant 50-150 cm tall. Leaves sinuate-dentate.

6

6.

+

Pappus white.

8. L. persica

–

Pappus reddish brown

7

7.

+

Pappus basally connate forming a crown of minute bristles, 1-3 mm long.

3. L. jacquemontiana

–

Pappus not forming a crown, 5-12 mm long.

8

8.

+

Pappus bristles as long as tubular floret or slightly shorter.

6. L. sibirica

–

Pappus bristles much shorter than tubular florets, as long as corolla tube.

5. L. fischeri