juncus
From LSJ
εἰ δὲ τύχῃ τις ἔρδων, μελίφρον' αἰτίαν ῥοαῖσι Μοισᾶν ἐνέβαλε → if someone is successful in his deeds, he casts a cause for sweet thoughts into the streams of the Muses
juncus,¹³ ī, m., jonc : Ov. M. 8, 336, etc. || tige semblable à un jonc : Plin. 26, 72.