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Key to Streptanthus

Brassicaceae

Streptanthus

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1 Cauline leaves petiolate or sessile (not clasping or amplexicaul); petals 4-11 mm long, the blade 1.5-4 mm wide; ovules either 28-50 or 90-120 per ovary (flower).
  2 Midstem leaves with entire margins; siliques 1.5-2 mm wide; ovules 90-120 per ovary (flower)
  2 Midstem leaves with lyrate-pinnatifid or runcinate margins; siliques 3.5-5 mm wide; ovules 28-50 per ovary (flower)
1 Cauline leaves clasping or amplexicaul; petals 11-21 mm long, the blade 5-11 mm wide; ovules 48-92 per ovary (flower).
    3 Racemes bracteate throughout, those lower in the raceme leaflike
      4 Sepals glabrous; lateral sepals lacking a subapical callus (rarely with a subapical callus 0.1-0.3 mm long).
        5 Cauline leaves acute, 3-6× as long as wide; [e. OK and e. TX]
        5 Cauline leaves obtuse, 1-2× as long as wide; [Ouachita and s. Ozark Mountains, w. AR]