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| Jepson Herbarium | |||||
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| Jepson eFlora
Key to families | Table of families and genera
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(For a list of species in Centaurea, use the above link.)
Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.
1. Corolla yellow
2. Heads sessile or subsessile, subtended by leaf-like bracts ..... C. benedicta
2' Heads generally peduncled (if not, then subtending bracts reduced)
3. Corolla 25–30 mm ..... C. sulphurea
3' Corolla generally 10–20 mm
4. Central spine of main phyllaries 5–10 mm, ± purple ..... C. melitensis
4' Central spine of main phyllaries 10–25 mm, straw-colored ..... C. solstitialis
1' Corolla white to pink, blue, or purple
5. Main phyllaries ± spine-tipped
6. Main phyllary tip-spine 6–25 mm
7. Pappus 0 ..... C. calcitrapa
7' Pappus present, 0.3–2.5 mm
8. Involucre body 8–14 mm diam, widely ovoid ..... C. iberica
8' Involucre body 5–10 mm diam, narrowly ovoid ..... C. pouzinii
6' Main phyllary tip-spine 1–5 mm
9. Outer flower corollas expanded, ± ray-like, >> disk flower corollas, 25–35 mm, pink-purple ..... C. diluta (2)
9' Outer flower corollas not or barely expanded, = or slightly > disk flower corollas, 7–13 mm, white to pink or pale purple
10. Involucre 10–13 mm; disk flower corolla 12–13 mm ..... C. diffusa
10' Involucre 7–8 mm; disk flower corolla 7–9 mm ..... C. virgata subsp. squarrosa
5' Main phyllaries not spine-tipped
11. Annual
12. Herbage ± tomentose; disk flower corolla 10–15 mm ..... C. cyanus
12' Herbage puberulent or ± glabrous, sometimes thinly cobwebby; disk flower corolla ± 20 mm ..... C. diluta (2)
11' Biennial or perennial herb
13. Outer and inner flowers bisexual; corollas all ± equal ..... C. jacea subsp. nigra
13' Outer flowers sterile, inner flowers bisexual; sterile flower corollas > bisexual flower corollas
14. Herbage densely gray-tomentose ..... C. cineraria
14' Herbage ± green, sometimes thinly cobwebby
15. Involucre 10–13 mm ..... C. stoebe subsp. micranthos
15' Involucre 15–18 mm
16. Phyllary appendages scarious, light brown, concave, entire to coarsely dentate ..... C. jacea subsp. jacea
16' Phyllary appendages light to dark brown, flat to ± concave, coarsely dentate to dissected into fine, wire-like lobes ..... C. jacea nothosubsp. pratensis
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [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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