Turpentine Wavewing - Cymopterus terebinthinus
Subacaulescent with a woody, branched caudex. Herbage glabrous, aromatic. Leaves long-petiolate; blades 2–15 cm long, ovate in outline, tripinnate; ultimate segments crowded, linear to lance-ovate. Umbels solitary; peduncles 7–25 cm long, erect to ascending; rays unequal, 3–30 mm long; involucre absent; involucel bracts linear, scarious, 1–3 mm long, united at the base. Flowers yellow; sepals 0.5–1 mm long. Mericarps glabrous, ovate, 5–8 mm long; ribs with plane to wavy wings 0.5–1 mm wide; oil tubes 3 to 12 per interval (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
We have varieties albiflorus
(Torr. & A. Gray) M.E. Jones and foeniculaceus
(Torr. & A. Gray) Cronquist.