Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Agoseris

View taxon page for Agoseris

(For a list of species in Agoseris, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Annual from slender taprootstem often leafy above base;  10–25 mm in fruit; outer fruits sometimes wavy-ribbed (or inflated and ribless) ..... A. heterophylla

2. Ligule 10–15 mm, much exceeding involucre; anthers 2–4 mm;   generally 3–5 pairs ..... var. cryptopleura

2' Ligule 2–6 mm, ± equaling involucre; anthers 1–1.5 mm; leaf lobes generally 2–3 pairs ..... var. heterophylla

1' Perennial herb from stout taproot, generally with ; stem generally not or obscurely leafy above base; involucre 10–60 mm in fruit; outer fruits generally straight-ribbed

3. Corolla orange, pink, or ± red, generally drying ± purple

4. Involucre not glandular-hairy;  generally ± purple ..... A. aurantiaca var. aurantiaca (2)

4' Involucre ± glandular-hairy; petiole generally not purple ..... A. ×elata (2)

3' Corolla yellow, outer generally ± purple abaxially, drying ± white but purple still evident

5. Fruit beak stout, << body; inner phyllaries generally not elongating in fruit

6. Peduncle generally 5–20 cm, ± glandular-hairy, base generally ± glandular-woolly; leaf  generally 2–10 cm, generally toothed or lobed (entire), lobes generally 2(+) pairs, ± divergent, proximal lobes angled towards leaf base, distal angled towards leaf tip or ; plant generally  or  ..... A. monticola

6' Peduncle generally 20–60 cm, ± glabrous or sparsely to densely hairy, hairs glandular or not; leaf blade generally 3–30 cm, , toothed, or lobed, lobes (if present) generally > 2 pairs, spreading or all angled in same direction; plant  to spreading or  decumbent

7. Leaves glabrous and glaucous to densely hairy, entire or few-toothed or -lobed;  generally hairy or ± glabrous in age except distally; phyllaries in 3–4 series, outer generally rosy-purple except margin, generally ± glandular-hairy ..... A. ×dasycarpa

7' Leaves ± glabrous, ± glaucous, generally ± entire or weakly few-toothed; peduncle generally glabrous, occasionally sparsely hairy distally; phyllaries in 2–3 series, outer green or ± rosy-purple, generally purple-spotted, generally ± glabrous proximally (weakly ciliate), hairs glandless ..... A. glauca var. glauca

5' Fruit beak ± slender, (< 1)1–4 × body; inner phyllaries ± elongating with fruit

8. Fruit beak 10–25 mm, (< 3)3–4 × body; leaves generally pinnately lobed or toothed (entire)

9. Ligule 6–15 mm, tube 10–20 mm; anthers 2–5 mm; pappus generally 15–20 mm, bristles in 4–6 series; leaf lobes generally angled toward leaf base; fruit body tip ± , not  to beak ..... A. retrorsa

9' Ligule 3–7 mm, tube 4–7 mm; anthers 1–3 mm; pappus 7–15 mm, bristles in 2–3 series; leaf lobes generally angled toward leaf tip or spreading; fruit body tip ± abruptly tapered to beak ..... A. grandiflora

10. Plant ± robust; leaves (± entire) toothed to pinnately lobed, generally >= 10 mm wide except lobes; leaf lobes ±  to oblanceolate; flowers generally 150–500; phyllaries green or generally rosy-purple, rarely purple-spotted, outer often exceeding inner at flower ..... var. grandiflora

10' Plant ± slender; leaves pinnately lobed (toothed), generally 2–4 mm wide except lobes; leaf lobes thread-like to lance-linear; flowers generally < 100; phyllaries generally rosy-purple and often purple-spotted, outer ± = or sometimes exceeding inner at flower ..... var. leptophylla

8' Fruit beak <= 10 mm, (< 1)1–3 × body; leaves entire to pinnately lobed

11. Fruit body 5–10 mm; corolla tube 6–15 mm, rarely shorter; pappus 9–20 mm

12. Leaf lobes generally angled toward leaf base or spreading;  10–20 mm, exceeding involucre; fruit beak (< 1)1–2 × body ..... A. parviflora

12' Leaf lobes generally angled toward leaf tip or spreading; ligule 5–10(+) mm, generally ± equaling (exceeding) involucre; fruit beak generally = body

13. Involucre not glandular-hairy; petiole generally ± purple ..... A. aurantiaca var. aurantiaca (2)

13' Involucre ± glandular-hairy; petiole generally not purple ..... A. ×elata (2)

11' Fruit body 3–5 mm; corolla tube 2–6 mm; pappus 4–10 mm

14. Leaves generally pinnately lobed (toothed); leaf lobes generally 5–7(+) pairs, 2°  occasionally 1; plant generally erect, leaves all ; ± inland in ± fine-textured soils – NCoR, ScV, CW ..... A. hirsuta

14' Leaves entire to pinnately lobed; leaf lobes if present generally 3–5(+) pairs, thread-like to ± spoon-shaped, 2° lobe generally 0; plant generally decumbent to ± erect, leafy stem present and ± buried by drifting sand, or leafy stem 0; coastal dunes and sand hills ..... A. apargioides

15. Ligule 3–6 mm, not or scarcely exceeding phyllaries; anthers 1.5–2.5 mm;  glabrous or hairs generally white-opaque, glandless – n NCo (Humboldt Bay n) ..... var. maritima

15' Ligule 8–16 mm, exceeding phyllaries; anthers 3.5–4.5 mm; head glabrous or hairs generally white- or yellow-translucent, glandular

16. Plant generally glabrous to ± densely hairy, hairs ± white; leaf blade generally 1–15 mm wide except lobes,  to oblanceolate, lobes if present thread-like to ± lanceolate (spoon-shaped) – CCo (San Francisco s to Cambria) ..... var. apargioides

16' Plant generally densely hairy, hairs ± yellow; leaf blade generally 15–30 mm wide except lobes, blade and lobes oblanceolate to ± spoon-shaped – c&s NCo, n CCo (Point Reyes n to Mendocino) ..... var. eastwoodiae


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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, [accessed on ]

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