The milky juice exuding from Asclepias, Leontodon, Lactuca, and the Euphorbiaceoe yield caoutchouc.    From Wordnik.com.  [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference

Lactuca (Ixeris) 235.    From Wordnik.com.  [Southern Arabia] Reference

Lactuca cretica, Desf.?.    From Wordnik.com.  [Southern Arabia] Reference

Lactuca elongata, Muhl.    From Wordnik.com.  [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference

Lactuca orientalis, Boiss.    From Wordnik.com.  [Southern Arabia] Reference

Lactuca dislocata occurs throughout.    From Wordnik.com.  [Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries] Reference

Lactuca.    From Wordnik.com.  [Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants] Reference

Lactuca?.    From Wordnik.com.  [Southern Arabia] Reference

Lactuca perennis.    From Wordnik.com.  [The Field and Garden Vegetables of America Containing Full Descriptions of Nearly Eleven Hundred Species and Varietes; With Directions for Propagation, Culture and Use.] Reference

Lactuca quercina.    From Wordnik.com.  [The Field and Garden Vegetables of America Containing Full Descriptions of Nearly Eleven Hundred Species and Varietes; With Directions for Propagation, Culture and Use.] Reference

Lactuca purpurea.    From Wordnik.com.  [Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries] Reference

Lactuca intybacea.    From Wordnik.com.  [The Field and Garden Vegetables of America Containing Full Descriptions of Nearly Eleven Hundred Species and Varietes; With Directions for Propagation, Culture and Use.] Reference

Lactuca intybacea, 382.    From Wordnik.com.  [The Field and Garden Vegetables of America Containing Full Descriptions of Nearly Eleven Hundred Species and Varietes; With Directions for Propagation, Culture and Use.] Reference

Lactuca elongata, 435.    From Wordnik.com.  [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference

Hufvudfatat - Lactuca capitata.    From Wordnik.com.  [Allgemeines Polyglotten-Lexicon der Naturgeschichte mit erklaerenden Anmerkungen] Reference

Lactuca, 180.    From Wordnik.com.  [Prodromus stirpium in horto ad Chapel Allerton vigentium] Reference

Lactuca, Bromus.    From Wordnik.com.  [Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries] Reference