1A.	Leaflets elliptic, ovate, or lanceolate, slightly asymmetric at base, 1 cm or more broad, leaflets 2–8 pairs per pinna	L. retusa
1B.	Leaflets linear, narrow–oblong, strongly asymmetric at the base, less than 1 cm wide, Leaflets 5-7-abundant pairs per pinna	2
2A.	Young shoots angled with corky ridges, these visible as distinct striations on the stem	L. esculenta
	Young shoots cylindrical	3
2B.	Petiolar gland stipitate, clove-shaped or sessile and concave, crateriform or patelliform, orifice is wide	3
3A.	Petiolar gland sessile, convex, shallowly conical, truncate–conical, verruciform, the orifice is a narrow or invisible pore	L. pulverulenta
3B.	Petiolar gland stipitate, clove-shaped or sessile and concave, crateriform or patelliform, orifice is wide	4
4A.	Petiolar gland cylindrical, subsessile or stipitate, club-shaped or circular	L. greggii
4B.	Petiolar gland concave, broad domed, crateriform, elliptical or circular	5
5A.	Leaves 20 × 12 cm or less in length or width; rachis of pinnae 8 cm long or shorter, leaflets 9–13 mm long; capitula 1.2–1.7 cm diameter at anthesis; fruit 9–13 × 1.3–1.8 cm	L. leucocephala ssp. leucocephala
5B.	Leaves 19 × 12 cm or more in length or width; rachis of pinnae 8 cm long or longer; leaflets (11-) 16–21 mm long; capitula greater than 1.8 cm in diameter in anthesis; fruit 12–19 × 1.8–2.1 cm	L. leucocephala ssp. glabrata