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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 Croptilon

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1 Stem leaves relatively even in size; stem leaves entire (to sometimes serrate near the apex); peduncles eglandular, also hirtellous to hispid; [TX Coastal Plain]
1 Stem leaves strongly reduced upwards on the stem, bracteal near the heads; stem leaves usually serrate near the apex (rarely entire); peduncles with stipitate glands, sometimes also hispid; [collectively widespread in our region, Coastal Plain from NC westwards to TX, inland to nw. SC, n. GA, n. AL, c. AR, and se. OK].
..2 Involucres turbinate, (2-) 2.5-5 mm wide; rays 5-11; ray blades 4-6 mm long; [widespread in our region, Coastal Plain from NC westwards to TX, inland to nw. SC, n. GA, n. AL, c. AR, and se. OK]
..2 Involucres campanulate, (3.5-) 5-8 (-10) mm wide; rays (10-) 13-21 (29); ray blades 6-12 mm long; [AR, OK, and TX].
....3 Stipitate hairs of peduncles as long as 0.2-0.3 mm long (including the gland); [c., se. and s. TX]
....3 Stipitate hairs of peduncles as long as 0.4-0.5 mm long (including the gland); [AR, OK, and nc. TX]
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