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    Vascular Plants of California
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Key to Lomatium

View taxon page for Lomatium

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

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

1. Marginal fruit wings very corky, incurved; fruit axis a corky ridge along middle of each fruit ..... L. fusiformis

1' Marginal fruit wings thin or corky, not incurved; fruit axis divided to base

2. At base and tip fruit evidently notched and wings narrower; leaflets or segments generally large

3. Leaflets coarsely dentate or some 3-lobed but not pinnately so

4. Leaf 1–2-ternate; fruit wings thickened, >> body in width; s California ..... L. lucidum

4' Leaf ternate-pinnate or 1–2-pinnate; fruit wings thin, ± >= body in width; n California

5. Plant < 8 dm; fruit wide-elliptic to round; Klamath Ranges ..... L. howellii

5' Plant < 5 dm; fruit wide-oblong; North Coast Ranges ..... L. repostum

3' Leaflets pinnately lobed, generally also toothed or irregularly cut

6. Leaf blade > petiole; fruit 15–18 mm – s Channel Islands ..... L. insulare

6' Leaf blade < to ± = petiole; fruit 6–14 mm

7. Leaflet spines weak; fruit wings >= body in width; Central Coast, South Coast Ranges ..... L. parvifolium

7' Leaflet spines strong; fruit wings < body in width; High Sierra Nevada, East of Sierra Nevada

8. Mature rays 25–50 mm; fertile pedicels 5–10 mm ..... L. rigidum

8' Mature rays 1–11 mm; fertile pedicels 0.1–1 mm ..... L. shevockii

2' At base and tip fruit not evidently notched and wings not narrower; leaflets or segments small to large

9. Plant from a definite, spheric to elongate or irregularly thickened, generally ± shallow tuber

10. Plant puberulent to hairy

11. Bractlets not scarious, ± fused, reflexing ..... L. macrocarpum (3)

11' Bractlets ± scarious, free to fused, not reflexing ..... L. nevadense (5)

10' Plant glabrous to ± scabrous but not hairy

12. Plant short-stemmed, from an elongate, generally tapered tuber; rays ± erect; fruit linear-oblong ..... L. bicolor var. leptocarpum (3)

12' Plant stem 0, from a ± spheric to ovoid tuber; rays ± spreading; fruit oblong to ovate

13. Pedicel 5–16 mm; bractlet ± = flower; tuber < 4 cm wide ..... L. canbyi

13' Pedicel 0–4 mm; bractlet 0 or < flower; tuber <= 2.5 cm wide

14. Corolla yellow; leaves ternate-1–2-pinnate; rays 1–12 mm, n&c High Sierra Nevada ..... L. stebbinsii

14' Corolla white; leaves 2–3-ternate; rays 10–50 mm; Klamath Ranges, n High Sierra Nevada, Modoc Plateau

15. Rays 2–5, 1–2 cm; pedicels 3–4 mm; fruit ± 5 mm, ± 4 mm wide; Modoc Plateau ..... L. hendersonii

15' Rays 3–20, 1–6 cm; pedicels 0.5–2.5 mm; fruit 5–9 mm, 3–4 mm wide; Klamath Ranges, n High Sierra Nevada, Modoc Plateau ..... L. piperi

9' Plant from a generally elongated, deep taproot (rarely with a deep-seated tuber at tip)

16. Leaf dissected or compound, segments or leaflets generally few, generally large, generally wide

17. Peduncle distally swollen, inflated ..... L. nudicaule

17' Peduncle distally not swollen, not inflated – rays occasionally webbed at base into prominent disk

18. Stem 0 or short; leaves 0–few. 1–3-pinnate

19. Plant base not fibrous; calyx 0 ..... L. martindalei (2)

19' Plant base fibrous; calyx prominent ..... L. parryi

18' Stem prominently leafy; leaf 1–2-ternate-pinnate

20. Herbage glaucous; leaflets wedge-shaped to obovate, 10–50 mm wide ..... L. californicum

20' Herbage green to ± gray, not conspicuously glaucous; leaflets linear to lance-ovate, 0.5–10 mm wide ..... L. triternatum

21. Ovary, generally fruit densely puberulent ..... var. macrocarpum

21' Ovary, fruit glabrous ..... var. triternatum

16' Leaf dissected, segments generally many, small, occasionally long but then narrow (see also Lomatium parryi)

22. Ovary puberulent to scabrous or hairy, fruit hairy (glabrous in age)

23. Plants generally with definite stem – stem leaves >= 1

24. Petals tomentose ..... L. dasycarpum

25. Leaf segments linear; pedicels generally > fruit ..... subsp. dasycarpum

25' Leaf segments thread-like; pedicels generally < fruit ..... subsp. tomentosum

24' Petals ± glabrous, not tomentose

26. Involucel 1-sided, reflexing, not scarious ..... L. macrocarpum (3)

26' Involucel not 1-sided, not reflexing, generally ± scarious

27. Corolla white to cream; cauline leaf sheaths inconspicuous ..... L. nevadense (5)

27' Corolla yellow; cauline leaf sheaths swollen

28. Herbage densely puberulent to glabrous; ovaries puberulent; bractlets generally obovate to oblanceolate, generally overlapping ..... L. utriculatum (2)

28' Herbage, ovaries generally scabrous; bractlets generally lanceolate to oblanceolate, not overlapping ..... L. vaginatum (2)

23' Stem 0

29. Corolla white to cream, occasionally purple-tinged; anthers generally purple

30. Bractlets ± glabrous; leaf segments linear to oblong ..... L. nevadense (5)

31. Ovary and generally fruit densely fine-hairy ..... var. nevadense

31' Ovary and fruit glabrous to ± scabrous ..... var. parishii

30' Bractlets glabrous to hairy; leaf segments linear to oblanceolate ..... L. ravenii

32. Ultimate leaf segments elliptic to obovate; bractlets minutely hairy; leaf bases rarely persistent ..... var. paiutense

32' Ultimate leaf segments linear to linear-oblong; bractlets glabrous or nearly so; leaf bases generally persistent ..... var. ravenii

29' Corolla yellow or purple; anthers generally yellow

33. Petiole > leaf blade; corolla generally purple (yellow); fruit wings >= body in width ..... L. mohavense

33' Petiole < leaf blade; corolla yellow (± purple); fruit wings generally 1/2 body in width ..... L. foeniculaceum

34. Petal margin minutely ciliate ..... subsp. fimbriatum

34' Petal margin glabrous

35. Rays generally 1, < 1.5 cm; subalpine scrub ..... subsp. inyoense

35' Rays generally 2–17, < 6 cm; sagebrush scrub, pine woodland ..... subsp. macdougalii

22' Ovary, fruit glabrous, occasionally scabrous

36. Plant generally with a definite stem, stem leaves generally >= 2

37. Stem base with 1 or more scarious, bladeless sheaths; fruit oblong-ovate to elliptic, wings thick, << body in width38. Fruit ± sessile; fertile pedicels generally 1–3 mm, < sterile ..... L. dissectum

38' Fruit distinctly pedicelled; fertile pedicels generally 5–15 mm, > sterile ..... L. multifidum

37' Stem base without conspicuous bladeless sheaths; fruit wings thin, < to > body in width

39. Corolla white, cream or ± purple

40. Plant glabrous to ± scabrous; bractlets 0–few, inconspicuous ..... L. martindalei (2)

40' Plant densely puberulent to tomentose; bractlets generally conspicuous, occasionally fused into a sheath

41. Involucel 1-sided, reflexing, not scarious ..... L. macrocarpum (3)

41' Involucel generally radial, spreading, scarious ..... L. nevadense (5)

39' Corolla yellow, occasionally white in age

42. Leaves generally not crowded at stem base; fruit wings >= body in width

43. Herbage puberulent to glabrous; ovaries generally puberulent – fruit generally glabrous ..... L. utriculatum (2)

43' Herbage, generally ovaries minutely scabrous ..... L. vaginatum (2)

42' Leaves crowded at stem base; fruit wings < body in width

44. Fruit linear-oblong; leaf segments linear, 10–30 mm, not crowded ..... L. bicolor var. leptocarpum (3)

44' Fruit oblong to ovate; leaf segments linear to oblong, 2–7 mm, crowded

45. Leaf ± gray, dull, petiole ± sheathing throughout; bractlets fused at base into 1-sided scarious cup; High Cascade Range, n High Sierra Nevada, Great Basin Floristic Province ..... L. austiniae

45' Leaf green, shiny, petiole sheathing to ± middle; bractlets free, inconspicuous; Klamath Ranges ..... L. hallii

36' Plant stem ± 0, cauline leaves 0, occasionally 1 or more at base of short stem

46. Fruit linear-oblong to oblong

47. Plant base fibrous; bractlets 0; fruit wings narrow, < 1/2 body; High Sierra Nevada ..... L. torreyi

47' Plant base not fibrous; bractlets several, linear; fruit wings narrow to broad, < or > 1/2 body; High Cascade Range, Modoc Plateau

48. Fruit narrowly oblong, 10–12 mm, 2–5 mm wide, wings narrow, < 1/2 body; High Cascade Range, Modoc Plateau ..... L. bicolor var. leptocarpum (3)

48' Fruit oblong, 8–16 mm, 5–9 mm wide, wings broad, > 1/2 body; Modoc Plateau ..... L. grayi

46' Fruit elliptic or ovate to ± round

49. Leaf segments thread-like to linear, long, not crowded; herbage green, generally shiny

50. Bractlets generally > 5, lanceolate to obovate, scarious, occasionally 0; pedicels stout – generally < fruit ..... L. caruifolium

51. Bractlets wide; fruit wings ± thin, wide ..... var. caruifolium

51' Bractlets narrow, occasionally 0; fruit wings thick, narrow ..... var. denticulatum

50' Bractlets 0–5, thread-like to lance-linear, ± scarious-margined; pedicels slender ..... L. marginatum

52. Corolla yellow; Klamath Ranges, Cascade Range Foothills, Inner North Coast Ranges, n&c Sierra Nevada Foothills, n High Sierra Nevada, Sacramento Valley ..... var. marginatum

52' Corolla ± red-purple; North Coast Ranges ..... var. purpureum

49' Leaf segments lanceolate or oblong to ovate (linear to thread-like), short, generally crowded; herbage generally glaucous or ± gray

53. Herbage clearly puberulent to tomentose

54. Leaf 2–3-pinnately dissected or compound; petiole sheathing in proximal 1/2; corolla white; Great Basin Floristic Province ..... L. nevadense (5)

54' Leaf ternate-pinnately dissected; petiole sheathing throughout; corolla yellow or purple; coast ranges

55. Corolla purple; bractlets scarious ± throughout ..... L. hooveri

55' Corolla generally yellow; bractlets narrowly scarious-margined

56. Ultimate leaf sections overlapping, broad, obtuse; fruit ± elliptic, wings thick; serpentine substrates, High North Coast Ranges, Inner North Coast Ranges ..... L. ciliolatum

56' Ultimate leaf sections less crowded, narrow, generally acute; fruit ovoid, wings thin; volcanic substrate, San Francisco Bay Area ..... L. observatorium

53' Herbage glabrous to minutely scabrous or sparsely puberulent

57. Pedicels generally > fruit; bractlets 0

58. Plant base fibrous; corolla pale yellow ..... L. congdonii

58' Plant base not fibrous; corolla ± purple ..... L. engelmannii

57' Pedicels < fruit; bractlets present

59. Leaf blade obovate, basal sheaths straw-colored; volcanic soils ..... L. peckianum

59' Leaf blade oblong to ovate, basal sheaths ± purple; serpentine substrates ..... L. tracyi


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [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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