Lactuca watsoniana Trel.

The Plant List Lactuca watsoniana Trel.
GRIN Taxonomy Lactuca watsoniana Trel.
Cichorieae Portal Lactuca watsoniana Trel.
Tropicos Lactuca watsoniana Trel.
Euro+Med Plantbase Lactuca watsoniana Trel.

Native distribution
Europe Portugal (Azores)

Key features
Lettuce gene pool Tertiary relative
Habitat Volcanic soils
Life history Perennial
Flower colour Blue
EURISCO (Dec. 2017) 0 accessions

Morphological description
Plant Height up to 180 cm
Rosette leaves Large, the lowest 30 x 15 cm, ovate with entire or roughly toothed margins. Apex acute, base narrowed into an alate petiole
Stem Erect
Stem leaves Ovate-lanceolate, sessile, sagittate at the base, scarcely dentate, glaucous, densely arachnoid-lanate beneath
Inflorescence Corymbose panicle
Heads ± 8 florets. Involucre 12-14 mm long, bracts lanceolate. Ligules blue
Achenes Ovate, 4-6 mm long, 2.0-2.5 mm broad, brownish green with yellowish spots, 5-8 ribs. Beak equalling about 1/3-1/2 of the achene. Pappus white
Reference Cichorieae Portal - based on Feráková V. (1977) The Genus Lactuca in Europe. Bratislava