Jepson eFlora
Key to families | Table of families and genera

Key to Eryngium

View taxon page for Eryngium

1. Plant stout, erect; bracts and sepals blue-tinged; inner bracts lobed at or distal to middle ..... E. articulatum

1' Plant slender to stout, prostrate to erect; bracts and sepals green, styles or anthers occasionally blue; inner bracts not lobed

2. Bract margins thickened, marginal spines 0

3. Leaf generally unlobed, margin sharply serrate to irregularly cut ..... E. armatum

3' Leaf pinnately to bipinnately lobed

4. Plant decumbent, ± green; main stem branched 1–6 cm distal to rosette; South Coast ..... E. pendletonense

4' Plant erect, silvery; main stem branched 7–32 cm distal to rosette; n&c Sierra Nevada Foothills ..... E. pinnatisectum

2' Bract margins not thickened, at least outer generally with spines

5. Leaf blade >> petiole, deeply pinnately or bipinnately lobed, lobes broad to narrow

6. Sepals pinnately lobed or toothed to entire, lanceolate, tapered to tip-spine

7. Bracts spiny on margin and abaxial surface; fruit scales lanceolate, acuminate ..... E. castrense

7' Bracts spiny on margins only, or 0–few abaxially; fruit scales oblong to ovate, acute ..... E. spinosepalum

6' Sepals generally entire, ovate, abruptly narrowed to tip-spine ..... E. vaseyi

8. Main stem branching 1–5 cm distal to rosette; sepal tips erect; n Sierra Nevada Foothills, se Sacramento Valley, ne San Joaquin Valley ..... var. vallicola

8' Main stem 0, plant branched within rosette; sepal tips generally reflexed; Outer South Coast Ranges ..... var. vaseyi

5' Leaf blade < petiole or petiole ± 0, leaf spiny-margined to dentate, serrate or irregularly cut, lobes 0 or shallow, broad

9. Plant prostrate or decumbent, with roots and juvenile leaves at nodes; inflorescence raceme-like ..... E. racemosum

9' Plant decumbent to erect, not rooting nor with juvenile leaves at nodes; inflorescence cyme-like

10. Bracts with many spines on margins and abaxial surface ..... E. mathiasiae

10' Bracts with 0 or few spines on abaxial surface

11. Main stem generally 0, plant branched within rosette; basal leaves generally > branches ..... E. alismifolium

11' Main stem present, branched distal to base; basal leaves < branches

12. Plant densely puberulent throughout; heads 5–7-flowered ..... E. constancei

12' Plant glabrous, or occasionally puberulent only on leaves or bracts; heads > 10-flowered

13. Plant stout, erect; leaf blade tapering to base, petiole obscure; sepal tip-spine generally 1–2 mm; outer bracts > 2 × inner bracts ..... E. jepsonii

13' Plant slender to stout, decumbent to erect; leaf blade abrupt-narrowed at base, < petiole; sepal tip-spine < 1 mm; outer bracts < 2 × inner bracts ..... E. aristulatum

14. Styles in fruit >> calyx; North Coast, North Coast Ranges, Sacramento Valley, San Francisco Bay Area ..... var. aristulatum

14' Styles in fruit ± = calyx; San Francisco Bay Area, South Coast Ranges, Southwestern California

15. Bract margins spiny ..... var. hooveri

15' Outer bract margin spines 0–3 pairs, inner bract spines 0 ..... var. parishii


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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