Devibhagavatapurana 11.17.34

11.17.34

evaṃ vidhānaṃ sandhyāyāḥ prātaḥkāle prakīrtitam |
sandhyākarma samāpyānte'pyagnihotraṃ svayaṃ hunet ||

O Nârada! Thus the rules of the morning Sandhyâ are prescribed. Doing works so far, bid farewell to the above-mentioned Gâyatrî. Next finishing the Agnihotra Homa sacrifice, worship the five Devatâs, S’ivâ, S’iva, Ganes’a, Sûrya and Visnu. Worship by the Purusa Sûkta mantra, or by Hrîm mantra, or by Vyahriti mantra or by S’rischate Laksmîs’cha, etc., place Bhavanî in the centre; Visnu in the north east corner, S’iva in the south-east corner; Ganes’a in the south-west corner, and the Sun in the north-west corner; and then worship them. While offering worship with the sixteen offerings, worship by repeating sixteen mantras. As there is no other act more merit-giving than the worship of the Devî, so the Devî should first of all be worshipped. Then worship in due order the five Devatâs placed in five positions. As the worship of the Devî is the chief object, so in the three Sandhyâs, the worship of the Sandhyâ Devî is approved of by the S’rutis. Never worship Visnu with rice; Ganes’a with Tulasî leaves; the Devî Durgâ with Durba grass and S’iva with Ketakî flower. The under-mentioned flowers are pleasing to the Devî:-- Mallikâ, Jâti, Kutaja, Panasa, Palâsa, Vakula, Lodha, Karavîra, S’ins’apa, Aparâjitâ, Bandhûka, Vaka, Madanta, Sindhuvâra, Palâs’a, Durbhâ, S’allakî, Mâdhavî, Arka, Mandâra, Ketakî, Karnikâra, Kadamba, Lotus, Champaka, Yûthikâ, Tagara, etc.