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Cal-tube chartaceous, of nearly uniform texture throughout, not ruptured by the developing fr, the lobes greenish and commonly more herbaceous; cor tubular-funnelform to nearly salverform; stamens included, often unequal or unequally inserted; seeds 1–3 per locule, those of the annual spp. becoming mucilaginous when wet; annual (seldom perennial) herbs with alternate, entire (ours) to variously dissected lvs, but without well defined lfls; fls mostly in terminal, head-like cymes. 13, temp. New World, mostly w. U.S.
