Passage 2.17.2
καὶ ἀπὸ μὲν Ἀκραίας τὸ ὄρος καλοῦσι τὸ ἀπαντικρὺ τοῦ Ἡραίου, ἀπὸ δὲ Εὐβοίας ὅσον περὶ τὸ ἱερόν, Πρόσυμναν δὲ τὴν ὑπὸ τὸ Ἡραῖον χώραν. ὁ δὲ Ἀστερίων οὗτος ῥέων ὑπὲρ τὸ Ἡραῖον ἐς φάραγγα ἐσπίπτων ἀφανίζεται. φύεται δὲ αὐτοῦ πόα πρὸς ταῖς ὄχθαις· ἀστερίωνα ὀνομάζουσι καὶ τὴν πόαν· ταύτην τῇ Ἥρᾳ καὶ αὐτὴν φέρουσι καὶ ἀπὸ τῶν φύλλων αὐτῆς στεφάνους πλέκουσιν.
The mountain opposite the temple of Hera is named after Acraea, and the region around the sanctuary is called Euboea; the land beneath the Heraeum, however, is known as Prosymna. The river Asterion, flowing above the Heraeum, disappears by plunging into a chasm. By its banks grows an herb, called asterion after the river itself; this plant is brought as an offering to Hera, and its leaves are woven into garlands.