Compilation
Sonchus integrifolius

perennial, glabrous, not glaucous; stem erect, terete, leafy, subsimple; leaves oblong or oblong-linear, acute, entire or the lower subruncinate, all strongly stem-clasping, and slightly adnate at base, the margin minutely callous-denticled; heads on very long pedicels; inv. quite glabrous, sc. 3-seriate, the inner membr. edged; achenes nearly linear, longitudinally ribstriate, the striæ smooth. This has much broader, less tapering and more entire leaves than any of this section; the cauline leaves especially more thoroughly amplexicaul, and partly adnate. Leaves 4–5 in. long, 1–1 1/2 in. wide.