1	"Involucre bracts generally fused, generally > 1 mm, generally forming cup or bowl about base of inflorescence; inflorescence not sessile above 1–2 leaves"	"Trifolium Group 1"
1	"Involucre bracts 0 or occasionally < 1 mm or forming a vestigial ring; inflorescence occasionally &plusmn; sessile above 1&ndash;2 &plusmn; reduced leaves (stipules of which occasionally involucre-like)"	"Trifolium Group 2"