Cleome tenella

Flora of Eastern Ghats: Hill Ranges of South East India, Volume 1 By T. Pullaiah, D. Muralidhara Rao, K. Sri Ramamurthy (2002- Description & Keys- Cleome monophylla, Cleome gynandra, Cleome viscosa, Cleome angustifolia (syn. of Cleome tenella L.f.), Cleome aspera, Cleome chelidonii & Cleome felina) 

Flora of Eastern Karnataka, Volume 1 By N. P. Singh (1988- Keys- Cleome monophylla, Cleome gynandra, Cleome viscosa, Cleome angustifolia (syn. of Cleome tenella L.f.), Cleome aspera, Cleome simplicifolia & Cleome felina) 

As per efi thread:

The confusion seems to be historical.
As per FBI and The Plant List, Cleome angustifolia A.Rich is synonym to C. tenella L.f.
Whereas, C. angustifolia Forssk. is a different species.
Both the species occur in Africa, but only C. tenella L.f. is found in India and C. angustifolia Forssk. is not reported here.
Hooker says “Indian specimens (of C. tenella L.f.) are rather smaller than African”.
It may be interesting to study our C. tenella carefully. 

Annual, slender, much branched, glabrous herbs, 10-50 cm high; young stems filiform. Leaves alternate, 3-foliolate; petioles 6-10 mm long; leaflets sessile, mostly filiform, narrowly linear or oblanceolate, acute at apex, 1.2-2 cm x 1-2 mm; lowest leaf with oblanceolate lobes. Flowers 3-3.5 mm across, in lax 2-5 flowered terminal and not clearly demarcated racemes, often solitary, axillary, pedicels to 6 mm long. Petals 3-4 mm long, yellow with purple nerves. Stamens 6. Capsules sessile or subsessile, linear-subterete, 1.5-5 cm x 1.5-2 mm, glabrous; seeds suborbicular, curved, 0.5-0.7 mm across, minutely rugulose with an open cleft, brown.