1	Plants densely villous or strigose	2
	Plants nearly smooth	4
2	Rays of umbel almost draw from the base, extremely elongated	L. hispida
	Plants compound umbels with long pedicels, umbrella not elongated	3
3	Bracts well developed, 2-pinnately divided	L. involucratum
	Bracts caducous, 1-pinnately divided	L. capillaceum
4	Umbels predominantly simple, rays drawn from base very unequal	L. litangensis
	Compound umbels, rays subequal	5
5	Basal leaves and lower stem leaves are 1-pinnately compound	L. integrifolia
	Basal leaves and lower stem leaves are 2–4-pinnately compound	6
6	Calyx teeth inconspicuous	7
	Calyx teeth prominent	8
7	Bracteoles margin not membranous	L. modesta
	Bracteoles with white membranous margin	L. oliverianum
8	Stems unbranched, scapiform, cauline leaves usually absent	L. scapiforme
	Stems simple or branched, cauline leaves present	9
9	Calyx teeth linear	10
	Calyx teeth subulate	11
10	Bracteoles with broad white membranous margins	L. wallichiana
	Bracteoles without white membranous margins	L. brachyloba
11	Leaf blade 1-2-pinnate, ultimate segments ovate to oblong-ovate	L. rechingeriana
	Leaf blade 3-4-pinnate, ultimate segments linear	L. dielsiana