עַרְבֵי נַחַל הָאָמוּר בַּתּוֹרָה [...] וּפִיו חָלָק
(See also Mishna Berura there, note 1, which seems to support my reading of the Mechaber)
When I went to the daled minim shuk tonight, all the aravos I saw appeared to have serrated edges, unlike the ones I'm used to from America (from my own backyard). The ones pictured below claim to be under the supervision of the Badatz Edah HaChareidis (you can see part of the logo, in reverse, in the picture). I also noticed some sets with the name of Rav Nissim Karelitz on them. (I don't have a picture of American aravos with me, at the moment)
Is this a problem with the aravos? If they are, indeed, kosher for use, how should the above-cited portion of Shulchan Aruch be understood?