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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Pectis

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1 Ray florets 8; [TX southwards].
..2 Annual or perennial; phyllaries widest towards tip, with a subterminal oil gland 0.5-1 mm long; pappi usually less than 1 mm long; [c TX (mainly Edwards Plateau)]
..2 Annual; phyllaries widest near middle, with a subterminal oil-gland less than 0.5 mm long; pappi often 1+ mm long; [s TX and southwards]
1 Ray florets 5; [LA and eastwards via coastal regions to NC]
....3 Heads on definite and long peduncles (1-4.5 cm long)
....3 Heads sessile, subsessile, or on short peduncles (to 1.2 cm long).
......4 Leaves mostly 1-2 (-3) mm wide; oil glands in 2 rows on the lower leaf surface near the leaf margin
......4 Leaves mostly 2-5 mm wide; oil glands scattered over the lower leaf surface.
........5 Involucre campanulate (distinctly spreading upwards); phyllaries separate, falling individually
........5 Involucre cylindrical; phyllaries adhering to one another and falling fused
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