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

Key to Eriastrum

View taxon page for Eriastrum

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

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

1. Longest stamens  >= 2 mm beyond corolla sinuses, anthers >= 1 mm

2. At least some plants in population , with some woody growth ..... E. densifolium

3. Plants of coastal dunes; corolla broadly 

4. Stems and leaves glabrous to subglabrous; inflorescence woolly ..... subsp. densifolium

4' Stems and leaves lightly to moderately woolly; inflorescence woolly ..... subsp. patens

3' Plants of chaparralalluvial scrubmontane forest, or desert scrub; corolla narrowly funnel-shaped to 

5. Stems and leaves glabrous to subglabrous, generally appearing green; inflorescence lightly to moderately woolly ..... subsp. austromontanum

5' Stems and leaves woolly, white-canescent to gray-green; inflorescence woolly

6. Leaf primary axis > 2 mm wide just above distal-most , lobe length generally < 2 × width of primary axis..... subsp. mohavense

6' Leaf primary axis < 2 mm wide just above distal-most lobe or if wider, then lobe length generally > 2 × width of primary axis

7. Corolla < 22 mm; widespread ..... subsp. elongatum

7' Corolla > 22 mm; floodplains of lower Santa Ana River (e SCo, sw SnBr) ..... subsp. sanctorum

2' Annual, sometimes stout or resprouting after summer rain, but no true woodiness

8. Corolla, filaments, and style bright golden yellow ..... E. luteum

8' Corolla, filaments, and style white to blue or purple, sometimes pale yellow but not bright golden yellow

9. Anthers <= 1 mm; corolla  generally < 4.4 mm

10. Ovule 1 per ovary chamber; SCoR, w SnJV ..... E. calocyanum (2)

10' Ovules > 1 per ovary chamber; s DMoj, DSon ..... E. diffusum (2)

11. Plants of western Coachella Valley vicinity in w DSon, e edge SnBr, e edge SnJt; corollas white or cream with bright yellow throat ..... subsp. coachellae

11' Plants outside Coachella Valley vicinity of e edge PR, SNE, DMoj, DSon; corollas white to sky-blue, throat yellow or yellow-spotted ..... subsp. diffusum

9' Anthers mostly > 1 mm; corolla lobe length >= 3.2 mm

12. Corolla , sinuses generally unequal; stamens generally exserted >= 3.5 mm beyond corolla sinuses, unequal; upper stems and leaves not to slightly glandular; D, n edge SnGb, n and e edges SnBr, e edge PR ..... E. eremicum subsp. eremicum (2)

12' Corolla  or slightly bilateral (mostly in color pattern), sinuses mostly equal to slightly unequal; stamens exserted 0.7–10 mm beyond sinuses, equal or unequal; upper stems and leaves not to densely glandular; c&s SN, n SNH, SnJV, CW, SW (exc ChI), GB, DMoj

13. Filaments > 4.5 mm

14. Tube + throat > 9 mm; plants of CCo, n SCoR; corollas mostly >= 15 mm; upper stems and leaves non-glandular, subglabrous to moderately woolly ..... E. virgatum

14' Tube + throat < 9 mm; plants from s SN, SW (exc ChI), SNE, w DMoj; corollas 7–15 mm; upper stems and leaves often densely glandular-hairy, sparsely to densely woolly ..... E. sapphirinum (2)

15. Heads slender, subglabrous to sparsely woolly, with 1–4 flowers and 1–4 bracts; calyces generally not hidden by bracts or woolly hairs ..... subsp. sapphirinum

15' Heads spherical to conical, woolly, with 3–10 flowers and generally > 2 bracts; calyces generally hidden by bracts and/or woolly hairs

16. Anthers < 2 mm; each ovary chamber with <= 4 ovules at flowering ..... subsp. ambiguum

16' Anthers > (1.5)2 mm; each ovary chamber with >= 4 ovules at flowering ..... subsp. dasyanthum

13' Filaments < 4.5 mm

17. Plants of SNH, GB, n DMoj, n DMtns; stamens generally exserted ± 0.7–2.3 mm beyond sinuses; throat  or funnel-shaped ..... E. wilcoxii (2)

17' Plants of c&s SN, SnJV, SnFrB, SCoR, SW (exc ChI), SNE, DMoj; stamens generally exserted >= 2 mm; throat , tapered, funnel-shaped, or bell-shaped

18. Mature leaves generally >= 5-lobed; upper stems and leaves not densely glandular-hairy; bracts sometimes glandular-hairy ..... E. pluriflorum

19. Corolla tube + throat length < 2 × lobe length; throat white; ovules 2–6 per ovary chamber ..... subsp. albifaux

19' Corolla tube + throat length >= 2 × lobe length; throat white to yellow or orange-yellow; ovules 1–3 per ovary chamber

20. Throat white, purplish, or pale yellow; lobes royal blue to violet ..... subsp. pluriflorum

20' Throat bright orange-yellow; lobes sky-blue, lavender, or nearly white ..... subsp. sherman-hoytae

18' Mature leaves generally <= 3-lobed (occasionally 5-lobed, rarely 7-lobed); upper stems and leaves often densely glandular-hairy; bracts often glandular-hairy ..... E. sapphirinum (2)

21. Heads slender, subglabrous to sparsely woolly, with 1–4 flowers and 1–4 bracts; calyces generally not hidden by bracts or woolly hairs ..... subsp. sapphirinum

21' Heads spherical to conical, woolly, with 3–10 flowers and generally > 2 bracts; calyces generally hidden by bracts and/or woolly hairs

22. Anthers < 2 mm; each ovary chamber with <= 4 ovules at flowering ..... subsp. ambiguum

22' Anthers > (1.5)2 mm; each ovary chamber with >= 4 ovules at flowering ..... subsp. dasyanthum

1' Longest stamens exserted <= 2 mm beyond corolla sinuses (if to 2.3 mm, anthers <= 1 mm), anthers mostly <= 1 mm (E. filifolium anthers to 1.1 mm)

23. Ovule 1 per ovary chamber (occasionally 1 chamber with 2 ovules, others with 1)

24. Leaves mostly with >= 3 thread-like lobes; inflorescence densely white-woolly – large in proportion to plant height; generally > 6 flowers open at same time ..... E. abramsii

24' Leaves with mostly <= 3, occasionally 4,  lobes; inflorescence moderately woolly; generally < 5 flowers open at same time

25. Plants of SCoR, w SnJV; stamens exserted <= 2.3 mm beyond corolla sinuses ..... E. calocyanum (2)

25' Plants of KR, NCoRH, NCoRI, e CaRH, c&s SN, Teh, SnFrB, MP (ne Shasta Co.); stamens , 0.6 mm below corolla sinuses, to exserted, 1.3 mm beyond sinuses ..... E. tracyi

23' Ovule > 1 per ovary chamber (occasionally 1 chamber with 1 ovule, others with > 1)

26. Corollas <= 7 mm; stamens included to exserted <= 1 mm beyond corolla sinuses; upper stems, leaves, and bracts not markedly glandular; plants of alkali areas or dry washes, not on dunes; s SNF, SnJV, ne SnFrB, s SCoRI, w DMoj

27. Stamens exserted 0.4–1 mm beyond corolla sinuses;  primary axis ± 1 mm wide; w DMoj (Rosamond Dry Lake area, Antelope Valley) ..... E. rosamondense

27' Stamens generally exserted <= 0.5 mm beyond corolla sinuses, sometimes included; leaf primary axis ± 0.5–0.75 mm wide; s SNF, SnJV, ne SnFrB, s SCoRI

28. Corolla tube + throat >= (3)3.7 mm; filaments >= 1.3 mm; ne SnFrB (Lime Ridge, Contra Costa Co.) ..... E. ertterae

28' Corolla tube + throat <= 3.6 mm; filaments <= 1.3 mm; s SNF (ne Kern Co.), SnJV, s SCoRI ..... E. hooveri

26' Corollas mostly >= 7 mm or if shorter, stamens exserted >= 1 mm beyond corolla sinuses, or upper stems, leaves, and bracts markedly glandular, or plants on semi-stabilized dunes, or plants from DSon; stamens exserted >= 0.5 mm beyond corolla sinuses; SNH, SW, GB, D

29. Anthers mostly >= 1 mm

30. Stamens generally equal (<= 0.3 mm length difference); corolla lobes <= 1.5 mm wide; leaf lobes thread-like; SW ..... E. filifolium

30' Stamens generally unequal (>= 0.2 mm length difference, generally > 0.5 mm difference); corolla lobes >= 1.3 mm wide; leaf lobes linear; SNH, n edge SnGb, n&e edges SnBr, e edge PR, GB, D

31. Plants of n edge SnGb, n&e edges SnBr, e edge PR, D; corollas bilateral, sinuses unequal ..... E. eremicum subsp. eremicum (2)

31' Plants of SNH, GB, n DMoj, n DMtns; corollas mostly radial, sinuses mostly equal ..... E. wilcoxii (2)

29' Anthers mostly <= 1 mm

32. Heads generally <= 3-flowered in total; upper stems, leaves, and bracts densely short-glandular-hairy, sparsely woolly ..... E. sparsiflorum

32' Heads generally >= 3-flowered, although only 1 flower may be open at a time with additional  or fruits in ; upper stems, leaves, and bracts may be slightly glandular but not densely short-glandular-hairy, moderately woolly

33. Ovules generally 2, sometimes 1 or 3, per ovary chamber; generally in pinyon-juniper woodland or chaparral ..... E. signatum

33' Ovules generally 2–7 per ovary chamber; generally in Mojave or Sonoran desert scrub

34. Plants almost exclusively on semi-stabilized desert dunes; filaments generally 0.75–1 mm; upper stems markedly woolly ..... E. harwoodii

34' Plants often in washes, flats, or gentle slopes, not generally on semi-stabilized dunes; filaments generally 1–3 mm; upper stems sparsely woolly ..... E. diffusum (2)

35. Plants of western Coachella Valley vicinity in w DSon, e edge SnBr, e edge SnJt; corollas white or cream with bright yellow throat ..... subsp. coachellae

35' Plants outside Coachella Valley vicinity of e edge PR, SNE, DMoj, DSon; corollas white to sky-blue, throat yellow or yellow-spotted ..... subsp. diffusum

 

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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]

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

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