Three four hairy species are quite confusing and we have to follow the following keys from Flora of Peninsular India as below:
36 Leaves elliptic lanceolate or oblong, more than twice as long as broad
38 Stipules prominent ovate lanceolate or lanceolate
39 Stem with spreading hairs
41 Pods slightly exserted, 15-20 seeded .... C.hirta
41 Pods much exserted , 20-35 seeds
42 Leaves villous beneath; bracts often 3 lobed; pods subsessile ..... C.mysorensis
42 Leaves appressed pubescent beneath; bracts simple; pods shortly stalked .... C.ferruginea
38 Stipules minute or 0.
43 Pods as long as or shorter than calyx
44 Calyx to 0.8 cm long; upper two lobes connate except at tip; pods globose ... C.linifolia
44 Calyx to 2.5 cm long; lobes connate at base only; pods oblong .... C. calycina
We have to re-examine all our observations, based on these keys.
In view of these keys, I think Dinesh ji's posted plant may be C.calycina