Mātikāvibhaṅga

Vinayapiṭaka · Bhikkhu Vibhaṅga (2) · Vol. 2 · Section 27

[27] The root of a tree belonging to a single family: that area which the shade pervades all around at midday — having deposited the robe within the shade, one should stay within the shade. The root of a tree belonging to different families: one should not go beyond hand's reach (hatthapāsa).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.