Reference for Eruvin 199:4

דדמו כמשוניתא דסלקין לעילא אסורין דנחתין לתתאי שרו לצדדין פלוגתא דרבה ורב ששת

are permitted,<span class="x" onmousemove="('comment',' Even by R. Shesheth, since roots as well as source are below three handbreadths from the ground.');">¹⁰</span> while as to those that grow sideways<span class="x" onmousemove="('comment',' Sc. they branch out from a root section that was above the three handbreadths level and bend downwards within that level.');">¹¹</span> a difference of opinion exists between Rabbah and R'Shesheth;<span class="x" onmousemove="('comment',' According to the former, their use is permitted since they are bent downwards and reached the low level which is regarded as the ground itself; while according to the latter they are forbidden on account of their source which is within the forbidden level.');">¹²</span> and the same<span class="x" onmousemove="('comment',' Divergence of view.');">¹³</span>

Jastrow