OregonFlora species comparison

slender, elongate taproots or irregularly thickened, elongate taproots with an elongate and slender upper portion 1–6 cm.

stout, irregularly thickened taproots.

simple, 2–3-branched or multicipital;

basal leaf sheaths from previous years weathering into a sparse thatch of a few; loose fibers or chaffy scales at base of stem or pseudoscape, previous year’s peduncles sometimes persistent in thatch as gray stalks.

simple or multicipital;

basal leaf sheaths from previous years weathering into a dense thatch of fibers and chaffy scales at base of stem, previous year’s peduncles long-persistent in thatch as gray stalks.

absent or 10–20 cm; pseudoscapes absent or < 1 cm, obscured by leaf sheaths and thatch.

4–15 dm.

biternate or 1–3-pinnate, glabrous, glabrate or sparsely puberulent or scaberulose along midnerves and margins, sparsely scabrous or pubescent below and glabrate or pubescent on midnerves above;

primary leaflets ternate or pinnate, 0–6 secondary leaflet pairs along each rachis;

laterals half to subequal to central primary in length;

secondaries pinnate; pinnatifid, ternate or entire;

tertiaries absent; entire; pinnatifid (2–3-lobed), ultimate apical lobes linear, narrowly elliptic, or narrowly oblong, 10–120 × 0.4–12 mm;

tips acute or acuminate, mucronulate or not.

glabrous;

primary leaflets pinnate, 5–8 secondary leaflet pairs along each rachis;

laterals at least half to subequal to central primary in length;

secondaries pinnate;

tertiaries pinnate; quaternaries entire or pinnatifid (3–20-lobed), ultimate leaflet pinnules not leafy to base, with a naked intercostal region between rachilla and basal-most pinnule (appearing like a petiolule); (4.5)5–8 mm, ultimate apical lobes linear; in cross section subterete; (6.5)7–15 × 0.1–0.4 mm;

tips acuminate.

0–2, similar to basal.

1–3 (more in robust plants), glabrous, similar to basal.

peduncles 1–6, 10–35 cm, glabrate or sparsely to moderately scaberulose or puberulent;

involucral bracts 0;

rays 3–25, 1.5–12 cm, glabrate, sparsely scaberulose, or puberulent;

involucel bractlets 0–12, linear or lanceolate, 1–6 × 0.1–0.4 mm, glabrous; entire;

margins narrowly scarious or not;

umbellets 10–70-flowered;

pedicels 2–8 mm, glabrous, glabrate, scaberulose on ridges.

peduncles 1–10+; stout, not inflated, 30–60 cm, 6–8 mm wide (1 cm below tip), glabrous;

involucral bracts 0;

rays 16–30, 4–12 cm, glabrous;

involucel bractlets 0–10, linear or lanceolate, 2–10 × 0.1–0.6 mm;

margins narrowly scarious;

umbellets 10–40-flowered;

pedicels 9–15 mm.

petals ochroleucous or yellow;

anthers ochroleucous or yellow.

petals yellow;

anthers yellow or ochroleucous.

oblong, narrowly oblong, elliptic or obovate, 7–16 mm, glabrous, glabrate, or sparsely scaberulose or puberulent;

body 1.3–4 mm wide;

wings 0.7–3 mm; thin;

vittae 1 in intervals, 2 on commissure.

oblong or elliptic, 9–16 mm, glabrous;

body 3–6 mm;

wings 1–2 mm; thin;

vittae 1–2 in intervals, 2–6 on commissure.