अग्निनिचयः (Agninichaya) / The Accumulation of Sacred Fire & the Classification of Pitṛs by Time-Order
स्थावराणां च पञ्चानां पुष्पं कालार्त्तवं स्मृतम् / ऋतुत्वमार्तवत्वं च पितृत्वं च प्रकीर्त्तितम्
sthāvarāṇāṃ ca pañcānāṃ puṣpaṃ kālārttavaṃ smṛtam / ṛtutvamārtavatvaṃ ca pitṛtvaṃ ca prakīrttitam
For the five kinds of immobile beings (sthāvara), the flower is remembered as kāla-ārtava—the seasonal sign of time. Here are also proclaimed seasonhood (ṛtutva), ārtava-ness, and fatherhood (pitṛtva).