Directory       News       Site Map       Home
         
    Jepson eFlora
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.

 

IVESIA

Barbara Ertter


Perennial herb, glandular; odor resinous. Leaf: generally basal, odd-1-pinnately compound, generally ± cylindric; cauline generally alternate, reduced; leaflets 4–80 per side, generally overlapped, generally divided ± to base. Inflorescence: cyme; pedicel bractlets 0. Flower: receptacle generally not stalked; hypanthium shallow or deep, bractlets (0)5, generally < sepals; petals generally 5, 1–5(7) mm, linear to obovate or round, acute to rounded; stamens 5–20(40), filaments generally thread-like; pistils 1–8(20), ovary superior, style attached below fruit tip, base ± rough-thickened. Fruit: achene.
30 species: western North America. (Eli Ives, Yale University, Connecticut pharmacologist, 1779–1861) [Ertter & Reveal 2007 Novon 17:315–325] Leaf, leaflet data for basal leaves.
Unabridged etymology: (Eli Ives, Yale University, Connecticut pharmacologist, participant in Pacific Railroad Survey, 1779–1861)
Unabridged references: [Ertter 1989 Syst Bot 14:231–244]

Key to Ivesia

1. Leaf ± flat, leaflets toothed or lobed generally < 3/4 to base, generally ± separate — plants rosettes or hanging clumps

2. Stamens 15–40 — s High Sierra Nevada, San Bernardino Mountains, Peninsular Ranges, East of Sierra Nevada, Desert Mountains ..... I. saxosa

2' Stamens 5–10

3. Hypanthium bractlets 5; Modoc Plateau, adjacent High Sierra Nevada ..... I. baileyi

4. Petals pale yellow; hypanthium bractlets ± = sepals ..... var. baileyi

4' Petals white; hypanthium bractlets ± < 1/2 sepals ..... var. beneolens

3' Hypanthium bractlets generally 0; Desert Mountains

5. Hypanthium width <= length, receptacle stalked in pistil-bearing portion; n Desert Mountains ..... I. arizonica var. arizonica

5' Hypanthium width > 2 × length; receptacle not stalked; e Desert Mountains ..... I. patellifera

1' Leaf ± cylindric, leaflets generally lobed ± to base, overlapped

6. Stamens 10–20 (if 10, cauline leaves >= 3)

7. Leaflets < 8 per side; stems hanging to ± matted; caudex few- to many-branched; rock outcrops

8. Leaflet lobes < 4; petals white; San Jacinto Mountains ..... I. callida

8' Leaflet lobes 3–6; petals yellow; e Desert Mountains ..... I. jaegeri

7' Leaflets > 10 per side; stems decumbent to erect; caudex 0–few-branched; meadows, sandy flats

9. Leaflets generally 15–20 per side; sheathing leaf bases glabrous; stamens 10–16, filament ± < 1 mm; style < 1.5 mm

10. Petals 4(5), pale yellow; inflorescence not red-tinged; s High Sierra Nevada ..... I. campestris

10' Petals 5, white or pink-tinged; inflorescence often red-tinged; c&s High Sierra Nevada ..... I. unguiculata

9' Leaflets >= 20 per side; sheathing leaf bases generally ± strigose; stamens 15–20; filament 1–4 mm; style ± > 2 mm

11. Inflorescence of separate flowers or generally < 5-flowered clusters; pedicels generally > 5 mm; leaflets generally 30–80 per side

12. Leaf mousetail-like, leaflets indistinct, obscured by dense, silvery hairs, lobes < 1.5 mm; stamens 15; pistil 1; granitic sand — High Sierra Nevada, Transverse Ranges, San Jacinto Mountains ..... I. santolinoides

12' Leaf not mousetail-like, leaflets overlapped but distinct, not obscured by hairs, lobes >= 2 mm; stamens 20; pistils >= 2; meadows

13. Herbage hairs ± 0 or appressed, < 1 mm; petals ± obovate; alkali meadows; n East of Sierra Nevada ..... I. kingii var. kingii

13' Herbage hairs spreading, < 4 mm; petals ± oblanceolate; generally on serpentine clays; c Klamath Ranges ..... I. pickeringii

11' Inflorescence of generally > 5-flowered clusters; pedicels generally < 3 mm (except lowest); leaflets 20–35 per side

14. Stem 10–20 cm, ± decumbent; leaves generally 4–8 cm, cauline ± 2; filament ± flat; San Bernardino Mountains ..... I. argyrocoma var. argyrocoma

14' Stem generally > 20 cm, decumbent to erect; leaves > 8 cm, cauline >= 3; filament thread-like, not flat; n High Sierra Nevada, Modoc Plateau

15. Petals white; hypanthium length >= width; hairs of stem base ± spreading, 2–4 mm ..... I. sericoleuca

15' Petals yellow; hypanthium length <= width; hairs of stem base ascending, < 2 mm ..... I. aperta

16. Petals 2–3 mm, oblanceolate; filament 1–1.5 mm; n High Sierra Nevada (except Dog Valley), s Modoc Plateau ..... var. aperta

16' Petals generally 4–7 mm, ± obovate; filament 2–4 mm; n High Sierra Nevada (Dog Valley, e Sierra Co.) ..... var. canina

6' Stamens 5 or 10; cauline leaves 1–3

17. Hypanthium bractlets > sepals — Klamath Ranges (Castle Crags) ..... I. longibracteata

17' Hypanthium bractlets ± 1/2 sepals

18. Inflorescence generally ± open between separate flowers or of ± loose clusters; plant ± matted from much-branched caudex; pedicels generally ± S-shaped in fruit; sheathing leaf bases strigose

19. Stamens 10; pistils 10–30 — c&s High Sierra Nevada ..... I. pygmaea (2)

19' Stamens 5; pistils generally < 5

20. Petals white to pale ± yellow, linear, ± 1 mm; plant densely hairy, glands not obvious; 1400–1800 m; Modoc Plateau ..... I. paniculata

20' Petals yellow, oblanceolate, ± 2 mm; plant moderately hairy, glands many; 2700–4000 m; n&c High Sierra Nevada, White and Inyo Mountains ..... I. shockleyi var. shockleyi

18' Inflorescence of 1–few generally head-like, 3–20-flowered clusters (becoming more open in Ivesia webberi); plant generally rosetted from 0–few-branched caudex; pedicels straight in fruit; sheathing leaf-bases hairy or not

21. Cauline leaves 2, ± opposite; leaflets 4–8 per side, lobes linear to lanceolate; 1500–1900 m — s-most Modoc Plateau, adjacent n High Sierra Nevada ..... I. webberi

21' Cauline leaves generally 1 or alternate; leaflets > 8 per side, lobes oblanceolate to ± round; > 1800 m

22. Leaf mousetail-like, leaflets indistinct, < 1 mm, hidden by dense, silvery hairs; petals 1–2 mm — c&s High Sierra Nevada ..... I. muirii

22' Leaf not mousetail-like, leaflets overlapped but distinct, generally > 1 mm, ± glabrous to ± hairy; petals >= 2 mm

23. Stamens 10; sheathing leaf-bases generally ± strigose; hypanthium length ± < l/2 width — c&s High Sierra Nevada ..... I. pygmaea (2)

23' Stamens 5; sheathing leaf-bases not strigose (± glabrous or glandular); hypanthium length > 1/2 width

24. Hypanthium length >= width; petals narrow-oblanceolate; pistils generally 2–4; fruit ± 2 mm, mottled brown ..... I. gordonii

25. Stems ascending to erect, generally not ± red ..... var. alpicola

25' Stems prostrate to ascending, dark ± red ..... var. ursinorum

24' Hypanthium length ± < width; petals ± obovate; pistils generally 5–15; fruit 1–1.5 mm, not mottled ..... I. lycopodioides

26. Leaflet lobes ± 1 mm, ± round, ± glabrous; petals 2–3 mm — rocky areas; n&c High Sierra Nevada, East of Sierra Nevada (Sweetwater Mtns) ..... var. lycopodioides

26' Leaflet lobes >= 1 mm, narrow-oblanceolate to obovate, often ± hairy; petals generally > 3 mm

27. Leaflet lobes 2–8 mm, ± glabrous to sparsely hairy, bristle-tip 0–0.5 mm; wet meadows; c&s High Sierra Nevada ..... var. megalopetala

27' Leaflet lobes 1–3 mm, moderately to densely hairy, bristle-tip generally 0.5–1 mm; vernally moist, rocky areas; c&s High Sierra Nevada, White and Inyo Mountains ..... var. scandularis

Contact/Feedback

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].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.