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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

ERIASTRUM

Sarah De Groot, David Gowen & Robert Patterson


Glabrous to woolly, glandular or not. Stem: generally erect. Leaf: cauline, alternate, generally pinnate-lobed or simple; lobes generally linear or lanceolate. Inflorescence: head-like, bracted, generally densely woolly; bracts leaf-like; flowers sessile. Flower: calyx lobes unequal, generally woolly; corolla radial or bilateral, funnel-shaped to salverform; stamens equal or not, anthers generally sagittate, pollen white or blue; style included or exserted. Seed: 1–several per chamber.
16 species: western North America. (Greek: woolly star) [Harrison 1972 Brigham Young Univ Sci Bull, Biol Ser 16:1–26] Apparently much undescribed variation; genus being revised. Key to species by David Gowen, Sarah De Groot.

Key to Eriastrum

1. Perennial herb ..... E. densifolium

2. Corolla 20–37 mm

3. Corolla 20–25 mm, lobes 1/3–1/2 corolla; leaves glabrous to subglabrous; coastal dunes, San Luis Obispo, Santa Barbara cos. ..... subsp. densifolium

3' Corolla 25–37 mm, lobes ± 1/3 corolla; leaves woolly; Santa Ana River drainage, sw San Bernardino Co. ..... subsp. sanctorum

2' Corolla < 20 mm

4. Leaves strongly recurved, blade wider at base than tip, lobes spine-tipped — East of Sierra Nevada, Mojave Desert ..... subsp. mohavense

4' Leaves not recurved, blade generally equally wide at base, tip, generally not spine-tipped

5. Bracts generally 5–9 lobed; inflorescence generally terminal, 10–20 flowered; leaves subglabrous to ± canescent ..... subsp. austromontanum

5' Bracts generally (0)3–5(7)-lobed; inflorescences generally terminal and axillary, 1–10(15)-flowered; leaves ± canescent to woolly ..... subsp. elongatum

1' Annual (occasionally short-lived perennial herb)

6. Stamens attached at or just below corolla sinus, corolla 11–24 mm ..... E. pluriflorum

7. Plant ± open; leaves thread-like; corolla generally salverform, tube + throat generally > 2 × lobes; chaparral, grassland, savanna, woodland, pine forest ..... subsp. pluriflorum

7' Plant generally dense, occasionally cespitose; leaves linear; corolla narrowly funnel-shaped, tube + throat generally <= 2 × lobes; open sandy flats, deserts ..... subsp. sherman-hoytiae

6' Stamens attached well below corolla sinus, if higher, corolla < 15 mm

8. Stamens exserted > 1/2 length of corolla lobes

9. Corolla lobes bright yellow ..... E. luteum

9' Corolla lobes white, lavender, or variously blue

10. Corolla generally bilateral; stamens generally unequal ..... E. eremicum subsp. eremicum

10' Corolla ± radial (or bilateral from unequal sinuses in Eriastrum sapphirinum), stamens generally equal

11. Stamens exceeded by tips of corolla lobes; corolla lobes < 4 mm ..... E. filifolium

11' Stamens equaling to exceeding tips of corolla lobes (almost equaling to exceeding in Eriastrum sapphirinum subsp. dasyanthum); corolla lobes >= 4 mm

12. Corolla tube > 3 × throat, tube + throat generally >= 1.5 × lobes; plants ± not glandular; Central Coast, n South Coast Ranges (Monterey, San Benito cos.) ..... E. virgatum

12' Corolla tube < 3 × throat, tube + throat generally <= 1.5 × lobes; plants often glandular; s Sierra Nevada Foothills, Southwestern California (except Channel Islands), w Desert ..... E. sapphirinum

13. Flowers 3+ per cluster; corolla lobes dark to royal blue, pale blue, or white; calyx, bracts occasionally ± glandular, woolly ..... subsp. dasyanthum

13' Flowers 1–3 per cluster; corolla lobes bright blue to lavender; calyx, bracts glandular, ± woolly to subglabrous ..... subsp. sapphirinum

8' Stamens included or exserted < 1/2 length of corolla lobes

14. Anthers including

15. Upper leaves, bracts generally pinnate-3–7-lobed; inflorescence many-flowered, densely bracted, densely woolly ..... E. abramsii

15' Upper leaves, bracts pinnate-1–4-lobed or palmate-5-lobed; inflorescence few-flowered, few-bracted, ± woolly

16. Corolla 5–7 mm, white; seeds (1)2–4 per chamber ..... E. hooveri

16' Corolla >= 7 mm, white, pink, lavender, or light blue; seeds 1(2) per chamber

17. Stamens 1.5–2 mm, filaments ± 2 × anther; corolla lobes narrowly elliptic, ± 3 × longer than wide ..... E. brandegeeae

17' Stamens 0.5–1.5 mm, filaments ± = anther; corolla lobes widely elliptic, ± 2 × longer than wide ..... E. tracyi

14' Anthers exserted

18. Stamens unequal; corolla lobes generally > 1.25 mm wide

19. Corolla generally 6–9 mm; stem wiry; plants erect or spreading, generally subglabrous; leaves generally 1–3-lobed near base; East of Sierra Nevada, Desert ..... E. diffusum

19' Corolla 9–14 mm; stem generally not wiry; plants erect, woolly-hairy to occasionally subglabrous; leaves entire or 1–7-lobed near base; High Sierra Nevada, Great Basin Floristic Province, n Desert Mountains ..... E. wilcoxii

18' Stamens equal; corolla lobes generally <= 1.25 mm wide

20. Plant minutely glandular-hairy ..... E. sparsiflorum

20' Plant woolly-hairy to woolly, generally ± not glandular

21. Corolla lobes pale yellow to white, without spots; sand dunes in creosote-bush scrub ..... E. harwoodii

21' Corolla lobes pale blue to pink, base generally with maroon spot that is occasionally faint; pinyon/juniper woodland, sagebrush scrub, pine/oak woodland ..... E. signatum

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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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