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1 Stamens (8-) 10-27; petals notched or irregularly lacerate at the apex; gynophore (stipe of the pistil, above the calyx) 2-6 mm long; leaflets (1-) 3
..2 Plants with nodal spines (and sometimes with prickles on petioles and leaf veins).
......4 Leaflets 3 throughout; petals usually purple; plants 30-80 cm tall; petiole 1.5-3.5 cm long; capsules glabrous, striate
......4 Leaflets 3 or 5 (at least some leaves with 5 leaflets present within a plant); petals white, sometimes purple; plants (50-) 90-150 cm tall; petiole 3.5-4.5 cm long (or longer); capsules glandular-pubescent
........5 Bracts subtending the pedicels minute
..........6 Style 0.2-0.8 mm long; gynophore 3-12 mm; stamens 6; sepals fused ¼-½ their length
..........6 Style 1-1.2 mm long; gynophore obsolete; stamens 14-25; sepals free