Allamanda

Allamanda blanchetii A.DC. (Images by (SIva Siva – identified by Alka Khare),(Siva Siva – identified by Prabhu Kumar) & (Debashish Bhaduri – identified by Nidhan Singh), (inserted by Bhagyashri Ranade))

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As per efi thread:
I think the difference given in another post as below by … may be more appropriate to differentiate them as per POWO (Allamanda schottii Pohl) and POWO (Allamanda cathartica L.):
“A. cathartica, long cylindrical tube and much shorter swollen upper half is distinctive, in A. schottii cylindrical portion is much shorter than moderately swollen upper portion”

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A. cathartica : A tropical twining vine with deeply veined, whorled leavesand large, trumpetshaped bright yellow flowers.
A. nerifolia (Syn. of Allamanda schottii Pohl): A bush typically grows to 4-5 ft tall. It bears clusters of yellow, trumpet-shaped flowers with orange-red throat stripes. Flowers are bell-shaped with a golden yellow corolla, striped orange at the throat.

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Pl. go through ‎Allamanda page (Apocynaceae) with images of species in efloraofindia (done mainly by Bhagyashri ji).

If you find any mis-identification, pl. let us know.
If anybody can send images of other species of this genera (for incorporation in the website), it will be really nice. Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.