KEY to the WISCONSIN ASTERACEAE

Tribe 9. HELENIEAE - sneezeweed tribe

(Source: Mickelson and Iltis, 1966; FNA, 2006.)

1. Receptacle naked; style branches truncate, without an appendage

................  HELENIUM - sneezeweed.

1. Receptacle bristly; style branches with a subulate appendage

................  GAILLARDIA - blanket-flower.

HELENIUM - sneezeweed

1.   Leaves filiform, less than 2 mm wide; stems not winged; disk yellow; very rare introduced weed (s = 2x; x = 15)

....  H. amarum var. amarum - bitter-weed, narrow-leaved sneezeweed.

1.   Leaves lanceolate; stems winged by the decurrent leaf bases.

2.    Disk florets yellow, 5‑lobed; ray florets pistillate; cauline leaves 1‑3.5 cm wide; widespread throughout (s = 2x; x = 16, 17, 18) .

....  H. autumnale - common sneezeweed.

2.    Disk florets dark brown, 4‑lobed; ray florets neuter; cauline leaves to 1 cm wide; very rare, in central Wisconsin (s = 2x; x = 14) .

....  H. flexuosum - purple-head or southern sneezeweed.

GAILLARDIA - blanket-flower

(s = 2x, 4x; x = 17)

........  G. aristata - common blanket-flower.