Protologue Description: LACTUCA HIRSUTA Muhl., forma calvifolia, n.f., foliis subtus glabris.
Leaves glabrous beneath.- MAINE: slightly open places in dry sandy pine woods, frequent, Norway, August 1 1919, Eames & Godfrey, no. 9657 (TYPE in Gray Herb.). MASSACHUSETTS: Falmouth, July 13, 1911, Williams. CONNECTICUTT: Waterbury, August 27, 1912, Blewitt, no. 1428; Canton, August 14 19012, Driggs.