XLVIII. LEGUMINORS-E. 309 



11. INDIGOFERA, Linu. 



Herbs, shrubs or undershrubs often silvery-canescent, more or less 

 densely clothed with appressed lueditixed hairs (sometimes mixed with 

 tomentum and laxer hairs). Leaves imparipiniiate or simple ; stipules 

 usually small, setaceous, very shortly adnate to the petiole ; leaflets 

 quite entire, sometimes stipellate. Flowers in axillary racemes or spikes, 

 each flower pedicelled or sessile in the axil of a caducous bract ; 

 bracteoles 0. Calyx minute ; teeth subequal or the lowest longest. 

 Corolla usually rosy or purple ; standard ovate or orbicular, sessile or 

 clawed, often persistent for a long time ; wings oblong, slightly adherent 

 to the keel, caducous ; keel erect, obtuse or acuminate, spurred on each 

 side near the base, caducous. Stamens diadelphous ; anthers uniform, 

 apiculate. Ovary sessile or subsessile. usually many-ovulate ; style 

 glabrous ; stigma capitate, often penicillate. Pod septate between the 

 seeds, usually liiiear-cylindric (rarely oblong or globose), turgid, rarely 

 flatfish (in /. echinata sickle-shaped). — Distrib. Throughout the warmer 

 regions of both hemispheres, abundant in Southern and Tropical Africa ; 

 species 250-300. 



Leaves siuiple. 

 Pod 1 -seeded. 



Pod sickle-shaped, spiny 1. I. cchinatu. 



Pod globose, not spiny 2. /. Unifolia. 



Pod 2 (or more) -seeded. 



Pod 2-seeded ; leaves ovate, cordate o. /. cordifolia. 



Pod 4-6-seeded ; leaves oblong, not cordate 4. /. BnlzelUi, 



Leaves itnparipintiate. 



Flowers in axillary sessile or sliort-peduncled heads. 



Leaves 3-foliolate ; pod 1 -2-seeded •"•. I. ciJamlulosa. 



Leaves o-11-foliolato. 



Pod 3-4-seedcd C). 1. t riyonelloidcs. 



Pod 2-seeded 7. I./nneaphylla. 



Flowers solitary. 



Herbaceous; stems prostrate 8. I. unifiora. 



Shrubby ; stems erect , rigid 9. /. aspalathoidcu. 



Flowers in axillary racemes. 



Pod quite flat and papery 10. I. anahaptista. 



Pod not flat and not papery. 

 Leaflets alternate. 



Leaves argenteo-canescent ; pod curved \\. I. paimfoUa. 



Leaves not argenteo-canescenl : pod straight 12. I.hendecaphylla. 



Leaflets opposite. 

 Leaflets 3-5. 



Leaflets 3 ; racemes 6-12-flowered. 



Terminal leaflet sessile 13. /. trifoliata. 



Terminal leaflet stalked 14. I.trita. 



Lower leaflets 3, the middle and upper leaflets 5 ; 



racemes 12-20-flowered 15. /. articulata. 



Leaflets 5. 



Pod deflexed 16. /. margmtdata. 



Pod not deflexed 17. I. glabra. 



Leaflets 7, 9 or 11 (sometimes 13 in /. tinctoria). 

 Racemes few-flowered. 



Racemes 3-6-flowered ; seels 8-12 ; pod toru- 



lose; hairs of stem not gland-tipped 18. I, tenuifolia. 



Racemes many-flowered. 

 Racemes 6- 12- flowered. 



Hairs of stem gland-tipped. 



Seeds 10-12 ; pod faintly torulose 19. /. viscosa. 



