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2 Flowers opening in morning; floral tubes 5-25 (-33) mm long, the upper half or more funnelform; plants glandular-puberulent. | |
2 Flowers opening in late afternoon or evening; floral tubes 15-60 (-70) mm long, the upper half or less funnelform; plants glabrous, strigillose, hirtellous, or pilose, sometimes also with glandular pubescence in inflorescence; [Oenothera hartwegii complex] | |
3 Leaf base clasping, truncate or subcordate; plants densely pubescent with a mixture of hairs, short-pilose and often hirtellous, sometimes also strigillose and glandular-puberulent in the inflorescence | |
3 Leaf base attenuate to obtuse; plants glabrous or sparsely strigillose, sometimes glandular-puberulent in inflorescence. | |
4 Plants glabrous throughout, or sometimes glandular-puberulent in inflorescence; blades linear to oblanceolate or lanceolate, margins entire to subentire, rarely undulate | |
4 Plants sparsely strigillose, sometimes also glandular-puberulent in inflorescence; blades mostly oblanceolate or lanceolate, margins serrulate to subentire, undulate | |
1 Buds 4-angled, sepals with conspicuously keeled midribs; stamens of 2 lengths, antisepalous filaments about 2× as long as antipetalous filaments; petals truncate to emarginate; [more widespread]; [subsection Calylophus]. | |
5 Stigmas surrounded by anthers; petals 5-12 (-20) mm long; pollen 30-60 (-80)% fertile. | |
6 Pubescence densely and finely strigillose; leaves linear to narrowly lanceolate or oblanceolate, 1-9 cm long, margins subentire to spinulose-serrate (if coarsely spinulose-serrate, longer than 3.5 cm); [widespread in the Great Plains] | |
6 Pubescence rather sparse, hairs stout; leaves mostly oblanceolate, 1.5-3.5cm long, margins coarsely spinulose-serrate; [dunes, sandy soil; endemic to se. TX, mostly along the coast] | |
7 Plants annuals or short-lived perennials, stems one to several, erect, 3-8 dm tall; leaves 2.5-9 cm long; [disjunct eastward as far as AL in calcareous substrates]. |