Can you help identify these flowers form Olavipe?

This is 'thumpa'; there is a spider on it.
See:

Tropical Medicinal Plants: Thumpa, a vanishing beauty

Periwinkle. See:

Health, Gardening: Periwinkle, a wonder plant

?

"Nanthyarvattam'. English name? Botanical name?

Locally this is called 'parijatham'. I don't think that is right.
English name? Botanical name?

Photos: Periwinkle by me, rest by Rejo.
Copyright reserved. Click to enlarge.