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Published In: Species Plantarum 2: 751. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus with more than 300 species, widely distributed in tropics and subtropics of both New and Old Worlds, with centre of distribution in Tropical Africa. In Pakistan it is represented by 24 species.


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Shrubs or herbs, generally pubescent, hairs medifixed appressed, sometimes mixed with basifixed hairs. Leaves pinnate or imparipinnate or palmately trifoliolate or unifoliolate or simple; leaflets entire; stipules present. Inflorescence an axillary raceme or spike or solitary axillary. Bract generally caducous, bracteoles absent. Calyx lobes or teeth subequal or lowermost longer. Vexillum sessile or clawed. Wing slightly cohering with the keel. Keel gibbous on each side and often spurred. Stamens 9+1, diadelphous, anthers uniform, apiculate. Ovary with numerous or 1 to 2 ovules, style glabrous, stigma capitate, often penicillate. Fruit linear or globose, terete, 4-3-seeded or compressed; septate between the seeds. Seeds globose to cylindric, truncate, compressed or quadrate.

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1 Leaves simple or unifoliolate (2)
+ Leaves not simple or unifoliolate (4)
2 (1) Leaves broadly ovate-cordate (fruit generally 2, rarely 1-seeded) Indigofera cordifolia
+ Leaves not cordate (3)
3 (2) Fruit 1-seeded Indigofera linifolia
+ Fruit 6-8-seeded Indigofera oblongifolia
4 (1) Gland tipped hairs present (5)
+ Gland tipped hairs not present (6)
5 (4) Fruit 4-6 rarely 8-seeded, seeds more or less discoid with irregular depressions Indigofera argentea
+ Fruit 10-12 or more seeded; seeds barrel-shaped, slightly quadrangular with plane ends Indigofera colutea
6 (4) Inflorescence axis spinescent Indigofera intricata
+ Inflorescence axis not spinescent (7)
7 (6) Leaflets alternate (8)
+ Leaflets opposite (11)
8 (7) Flowers in elongated racemes Indigofera tinctoria
+ Flowers in axillary heads, sessile or short peduncled (9)
9 (8) Fruit 3-6-seeded Indigofera sessiliflora
+ Fruit 1-3-seeded (10)
10 (9) Entire plant whitish hoary, fruit 1-seeded, almost circular Indigofera nephrocarpa
+ Plant not whitish hoary, fruit 1-3-seeded, cylindrical Indigofera linnaei
11 (7) Fruit flattened (12)
+ Fruit not flattened (13)
12 (11) Perennial; fruit 2-5-seeded Indigofera arabica
+ Annual; fruit 5-9-seeded Indigofera hochstetteri
13 (11) Leaflets 3 per leaf (14)
+ Leaflets more than 3 per leaf, leaf pinnate (16)
14 (13) Leaflets beset with brown glands on the abaxial side; fruit narrowly winged on both sides of the sutures Indigofera trifoliata
+ Leaflets without glands, fruit not winged on either side of the sutures (15)
15 (14) Inflorescence axis more than 4.5 cm long Indigofera trita var. maffei
+ Inflorescence axis less than 4.5 cm long Indigofera trita L. f. var. trita
16 (13) Fruit hairy (17)
+ Fruit glabrous (25)
17 (16) Fruit tetragonal with stiff spreading hairs Indigofera astragalina
+ Fruit not tetragonal (18)
18 (17) Inflorescence 3-6-flowered Indigofera tenuifolia
+ Inflorescence more than 6-flowered (19)
19 (18) Fruit torulose, 1-6-seeded (20)
+ Fruit not torulose, 10-12-seeded (23)
20 (19) Fruit c. 1-1.5 mm broad, leaf c, 2-3.5 cm long; Inflorescence c. 5 mm long Indigofera sessiliflora
+ Fruit c. 3-3.5 mm broad, leaf 6-8 cm long; inflorescence c. 4 cm long (21)
21 (20) One seeded part of the fruit definitely globose, sutures less broad (fig. 13); the number of leaflets pre leaf up to 7, the length of the longest rachis up to 6 cm long Indigofera articulata
+ One seeded part of the fruit not globose, sutures more broad than those of I. articulata (Fig. 13); the number of leaflets per leaf up to 11, the length of the longest rachis up to cm long (22)
22 (21) Leaflets glabrous adaxially Indigofera caerulea Roxb. var. caerulea
+ Leaflets pilose on both sides Indigofera caerulea var. occidentalis
23 (19) Length of the vexillum 5 mm or less Indigofera tinctoria
+ Length of the vexillum more than 5 mm (24)
24 (23) Plant large, shrubby, leaflets 9-17, c. 1.0-1.3 cm long; fruit c. 2.5-5.0 cm long Indigofera heterantha var. gerardiana
+ Plant smaller, leaflets 13-31 per leaf, c. 5-8 mm long; fruit c. 1.1-1.5 cm long
25 (16) Inflorescence with sterile bracts at the base Indigofera cassioides
+ Inflorescence without sterile bracts at the base (26)
26 (25) Bracts cymbiform at the base, erect, enclosing the flower before anthesis (27)
+ Bracts not cymbiform, erect, but not enclosing the flower (28)
27 (26) Leaflets glabrous adaxially Indigofera hebepetala var. glabra
+ Leaflets pubescent on both surfaces Indigofera hebepetala Benth. ex Baker var. hebepetala
28 (26) Flower shorter than the subtending bract Indigofera atropurpurea
+ Flower longer than the subtending bract (29)
29 (28) Calyx teeth lanceolate, exceeding the cup Indigofera himalayensis
+ Calyx teeth deltoid, not exceeding the cup Indigofera hamiltonii
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