Jepson eFlora
Key to families | Table of families and genera

Key to Layia

View taxon page for Layia

1. Disk pappus 0

2. Plant glandless; paleae subtending ± all disk flowers ..... L. chrysanthemoides (2)

2' Plant glandular; paleae in 1 involucre-like series between ray and disk flowers

3. Plants apple- or banana-scented; basal rosette leaves generally minutely dentate to minutely serrate (coarsely toothed); ray corolla white or cream ..... L. heterotricha (2)

3' Plants unscented or not apple- or banana-scented; basal rosette leaves lobed; ray corolla white, yellow, or 2-colored, yellow proximally, distally ± white or pale yellow

4. Stem generally purple-streaked; involucre bell-shaped to hemispheric, ± spheric, or ± urn-shaped

5. Involucre ± spheric to bell-shaped or hemispheric; ray flowers 6–18 in 1 series, ray yellow throughout or distally white or pale-yellow ..... L. gaillardioides (2)

5' Involucre ± widely urn-shaped; ray flowers 13–27 in 2 series, ray 2-colored ..... L. jonesii (2)

4' Stem generally not purple-streaked; involucre ± hemispheric

6. Plant not strongly scented; ray yellow throughout or distally white; anthers generally ± dark purple, sometimes yellow to ± brown in Southwestern California ..... L. platyglossa (2)

6' Plant strongly lemon- or acrid-scented; ray white or yellow; anthers yellow to ± brown ..... L. pentachaeta (2)

7. Ray white ..... subsp. albida

7' Ray yellow ..... subsp. pentachaeta

1' Disk pappus of 1–32 awns, bristles, or scales

8. Heads discoid ..... L. discoidea

8' Heads radiate, ray sometimes inconspicuous

9. Paleae subtending ± all disk flowers; plant glandless

10. Disk pappus of generally very unequal, awl-shaped or bristle-like awns and scales ..... L. chrysanthemoides (2)

10' Disk pappus of ± equal, lanceolate scales ..... L. fremontii

9' Paleae in 1 involucre-like series between ray and disk flowers; plant glandular

11. Disk pappus of elliptic or lance-linear to ovate, non-plumose, non-woolly scales, 0.5–3.5 mm, bases sparsely bristly

12. Ray white; anthers yellow to ± brown; ray fruit sparsely hairy ..... L. leucopappa

12' Ray proximally yellow, distally white; anthers ± dark purple; ray fruit glabrous or sparsely hairy

13. Ray flowers 13–27 in 2 series; stem generally purple-streaked; pappus 0.5–2 mm; ray fruit shiny, glabrous; s Central Coast, c Outer South Coast Ranges ..... L. jonesii (2)

13' Ray flowers 6–15 in 1 series; stem not purple-streaked; pappus 2–3.5 mm; ray fruit ± dull, glabrous or sparsely hairy; s San Joaquin Valley ..... L. munzii

11' Disk pappus generally of bristles or bristle-like scales, 1–7 mm, if scales linear and long-tapering or awl-shaped, then proximally plumose and often proximally woolly adaxially

14. Disk pappus bristles or scales proximally plumose and adaxially woolly, or ± scabrous throughout, if proximally plumose and not woolly, then scales linear and long-tapering or awl-shaped; plant generally not strongly scented if not touched

15. Disk pappus of 10–15 linear and long-tapering or awl-shaped scales; ray generally ± white, sometimes pale or golden yellow ..... L. glandulosa

15' Disk pappus of (11)14–32 bristles or bristle-like scales; ray yellow throughout or distally white

16. Disk pappus generally scabrous throughout, sometimes proximally plumose and adaxially woolly in Southwestern California; ray yellow throughout or distally white; anthers generally ± dark purple, sometimes yellow to ± brown in Southwestern California; involucre ± hemispheric; phyllary tips often > folded bases ..... L. platyglossa (2)

16' Disk pappus densely plumose proximally and adaxially woolly; ray yellow; anthers yellow to ± brown; involucre narrower, bell-shaped to ± ellipsoid; phyllary tips generally < folded bases ..... L. septentrionalis

14' Disk pappus bristles or bristle-like scales proximally plumose, generally not woolly adaxially; plant generally strongly scented, even when not touched (except fleshy plants of coastal dunes)

17. Disk pappus readily falling as a unit; basal rosette leaves generally minutely dentate or minutely serrate (coarsely toothed); ray white or cream ..... L. heterotricha (2)

17' Disk pappus persistent; basal rosette leaves lobed; ray white or yellow throughout, or proximally yellow and distally white or pale yellow

18. Anthers yellow to ± brown ..... L. pentachaeta (2)

19. Ray white ..... subsp. albida

19' Ray yellow ..... subsp. pentachaeta

18' Anthers ± dark purple

20. Stem not purple-streaked; ray white, 1.5–3.5 mm; ray fruit sparsely hairy ..... L. carnosa

20' Stem purple-streaked; ray yellow throughout or distally ± white or pale yellow, 1–18 mm; ray fruit glabrous

21. Ray yellow throughout or distally ± white or pale-yellow, 3.5–18 mm; disk pappus of 15–24 bristles or bristle-like scales, main stem ascending, not strictly erect ..... L. gaillardioides (2)

21' Ray yellow, 1–4 mm; disk pappus of 10–16 bristles or bristle-like scales; main stem strictly erect ..... L. hieracioides

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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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