Biennials, (15–)40–200(–450+) cm. Leaves on proximal 1/2–3/4 of each stem; blades of undivided cauline leaves oblong, obovate, or lanceolate to spatulate or lance-linear, margins entire or denticulate, midribs sometimes sparsely pilose. Heads in ± corymbiform to paniculiform arrays. Involucres 10–12+ mm. Phyllaries usually reflexed in fruit. Florets 15–20+; corollas bluish or yellowish, usually deliquescent. Cypselae: bodies brown (often mottled), ± flattened, elliptic, 2.5–3.5 mm, beaks ± filiform, 1–3 mm, faces 1(–3)-nerved; pappi white, 5–6 mm. 2n = 34.
Leafy-stemmed annual or usually biennial 3–25 dm, glabrous or occasionally coarsely hirsute, often ± glaucous; lvs highly variable, entire or toothed to pinnately lobed or cleft, sagittate or sometimes narrowed to the base, 10–35 × 1.5–12 cm; heads numerous, small, with 13–22 yellow fls; invol 10–15 mm in fr; achenes blackish, very flat, with a median nerve on each face, transversely rugulose, 4.5–6.5 mm overall, the slender beak from a little more than half to about as long as the body; mature pappus 5–7 mm; 2n=34. Fields, waste places, and woods; Que. and P.E.I. to Sask., s. to Fla. and Tex. July–Sept. (L. sagittifolia; L. steelei)
Caule: cor do látex laranja/amarelado. Folha: lâmina(s) lobada(s); projeção espinescente(s) ausente(s). Flor: cor da antera(s) amarela; cor da corola amarelo escuro. Fruto: ala(s) presente(s); cor do fruto(s) castanha; rostro presente(s).
Tallo: color del latex naranja/amarillento. Hoja: lámina(s) lobada(s); proyeccion espinescente(s) ausente(s). Flor: color de la antera(s) amarilla; color de la corola amarillo escuro. Fruto: ala(s) presente(s); color del fruto(s) marron; rostro presente(s).
Stem: colour of the latex orange/yellowish. Leaf: blade lobate; projection spinescent absent. Flower: colour of the anther yellow; colour of the corolla yellow dark. Fruit: wing present; colour of the fruit brown; rostrum present.
