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1 Annual herbs from a taproot; epidermis of the lower stem exfoliating; [section Xerolobium]
....3 Pubescence of the main stem densely villous, the hairs spreading; vestiture of the leaf upper surfaces villous
......4 Leaf blades 1-7 mm wide; leaf upper surfaces densely strigillose-puberulent; inflorescence erect to arching in bud (later erect)
......4 Leaf blades 2-19 mm wide; leaf upper surfaces glabrous or nearly so; inflorescence nodding in bud (later erect)
..........6 Petals 9-20 mm long, shallowly notched at the apex; leaves (all) sessile and slightly clasping the stem; plants perennating by long (to 1 m), thick, ropelike stolons
..........6 Petals 4-9 mm long, deeply notched at the apex; leaves either short-petiolate (low on the stem) or sessile to subsessile (higher on the stem), not clasping the stem; plants perennating by short offsets
............ 7 Mature coma (attached to plump seeds) cinnamon brown (paler when immature); seed surfaces papillose (the papillae sometimes forming weak lines); inflorescence axes with eglandular strigillose hairs only; petals 2.5-5.5 mm long, white.
............ ..8 Herbs with basal rosettes; petals 2-6 (-9) mm long, white (sometimes pink)
............ ..8 Herbs with large (5-12 mm long) turions borne 1-10 cm below the ground's surface; petals 4.5-12 (-14) mm long, rose or pink (rarely white)