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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  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 CA

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

5' Plant < 5 dm; fruit wide-oblong; NCoR ..... L. repostum

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

6. Leaf fruit 15–18 mm – s ChI ..... L. insulare

6' Leaf  < to ± = fruit 6–14 mm

7. Leaflet spines weak; fruit wings >= body in width; CCo, SCoR ..... L. parvifolium

7' Leaflet spines strong; fruit wings < body in width; SNH, SNE

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

8' Mature rays 1–11 mm; fertile  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  to hairy

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

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

10' Plant glabrous to ± scabrous but not hairy

12. Plant short-stemmed, from an elongate, generally  tuberrays ± fruit linear-oblong ..... L. bicolor var. leptocarpum (3)

12' Plant stem 0, from a ± spheric to ovoid tuberrays ± fruit  to 

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 SNH ..... L. stebbinsii

14' Corolla white; leaves 2–3-ternate; rays 10–50 mm; KR, n SNH, MP

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

15' Rays 3–20, 1–6 cm;  0.5–2.5 mm; fruit 5–9 mm, 3–4 mm wide; KR, n SNH, MP ..... L. piperi

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

16. Leaf dissected or compoundsegments 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 calyx 0 ..... L. martindalei (2)

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

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

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

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

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

21' Ovaryfruit glabrous ..... var. triternatum

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

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

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

24. Petals  ..... L. dasycarpum

25. Leaf segments  generally > fruit ..... subsp. dasycarpum

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

24' Petals ± glabrous, not 

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  sheaths inconspicuous ..... L. nevadense (5)

27' Corolla yellow; cauline  sheaths swollen

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

28' Herbageovaries generally scabrousbractlets generally  to oblanceolate, not overlapping ..... L. vaginatum (2)

23' Stem 0

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

30. Bractlets ± glabrous segments  to  ..... 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;  segments  to oblanceolate ..... L. ravenii

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

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

29' Corolla yellow or purple; anthers generally yellow

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

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

34. Petal margin minutely  ..... 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' Ovaryfruit glabrous, occasionally scabrous

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

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

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

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

39. Corolla white, cream or ± purple

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

40' Plant densely  to bractlets generally conspicuous, occasionally fused into a 

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

41' Involucel generally 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  to glabrousovaries 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;  segments , 10–30 mm, not crowded ..... L. bicolor var. leptocarpum (3)

44' Fruit  to  segments  to oblong, 2–7 mm, crowded

45. Leaf ± gray, dull,  ± sheathing throughout; bractlets fused at base into 1-sided scarious cup; CaRH, n SNH, GB ..... L. austiniae

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

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

46. Fruit linear-oblong to 

47. Plant base bractlets 0; fruit wings narrow, < 1/2 body; SNH ..... L. torreyi

47' Plant base not bractlets several, fruit wings narrow to broad, < or > 1/2 body; CaRH, MP

48. Fruit narrowly , 10–12 mm, 2–5 mm wide, wings narrow, < 1/2 body; CaRH, MP ..... L. bicolor var. leptocarpum (3)

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

46' Fruit  or  to ± round

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

50. Bractlets generally > 5,  to obovate, scarious, occasionally 0;  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;  slender ..... L. marginatum

52. Corolla yellow; KR, CaRF, NCoRI, n&c SNF, n SNH, ScV ..... var. marginatum

52' Corolla ± red-purple; NCoR ..... var. purpureum

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

53. Herbage clearly  to 

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

54' Leaf ternate-pinnately dissected 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  sections overlapping, broad, fruit ± wings thick; serpentine substrates, NCoRH, NCoRI ..... L. ciliolatum

56' Ultimate  sections less crowded, narrow, generally fruit ovoidwings thin; volcanic substrate, SnFrB ..... L. observatorium

53' Herbage glabrous to minutely scabrous or sparsely 

57. Pedicels generally > fruitbractlets 0

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

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

57' Pedicelsfruitbractlets present

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

59' Leaf   to  sheaths ± purple; serpentine substrates ..... L. tracyi

 

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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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