1	Fruit cylindrical		(2)
+	Fruit not cylindrical (c. 2 cm long)		(9)
2 (1)	Fruit less than 2 cm long (slightly curved)		(3)
+	Fruit more than 2 cm long		(6)
3 (2)	Fruit wavy		Trigonella anguina
+	Fruit not wavy		(4)
4 (3)	Inflorescence subsessile		Trigonella monspelica
+	Inflorescence pedunculate		(5)
5 (4)	Fruit slightly arcuate, c.1 cm or less long		Trigonella hamosa
+	Fruit arcuate, more than 1 cm long		Trigonella uncata
6 (2)	Fruit with a long bead, veins not transversely oriented		Trigonella foenum-graecum
+	Fruit not beaded, veins transverse and oblique		(7)
7 (6)	Inflorescence pedunculate		Trigonella monantha ssp. incisa
+	Inflorescence sessile		(8)
8 (7)	Fruit more than 3 cm long		Trigonella monantha ssp. monantha
+	Fruit 3 cm or less long		Trigonella orthoceras
9 (1)	Fruit sickle-shaped		Trigonella corniculata
+	Fruit not sickle-shaped		(10)
10 (9)	Fruit c. 3.5-4.0 mm long		Trigonella occulta
+	Fruit more than 4 mm long		(11)
11 (10)	Fruit pilose		Trigonella pubescens
+	Mature fruit glabrous		(12)
12 (11)	Stipules linear (slightly serrate sometimes), not foliaceous		Trigonella gracilis
+	Stipules serrate, foliaceous		(13)
13 (12)	Calyx length more than half the corolla (vexillum and wing longer than keel)		Trigonella emodi
+	Calyx length less than half the corolla		(14)
14 (13)	Vexillum longer than the keel		(15)
+	Vexillum equal to or shorter than the keel		(16)
15 (14)	Wing longer than the keel		Trigonella fimbriata
+	Wing shorter than the keel		Trigonella gharuensis
16 (14)	Fruit stalk c. 1-2 mm long, shorter than the calyx cup; fruit 11-16 mm long, c. 4-5 mm broad		Trigonella cachemiriana
+	Fruit stalk c. 4.5-5 mm long, longer than the calyx cup; fruit 11-12 mm long, c. 6-6.5 mm broad		Trigonella podperae