Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera
    Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
   
   

Key to Fabaceae

View taxon page for Fabaceae

 

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

Key to Groups

1. Flower calyxcorolla generally inconspicuous; petals free or fused not overlapped in stamens 10 or generally many, often long-exserted;  2-pinnate (simple in alien Acacia) ..... Group 1: Mimosoideae

1' Flower generally , less often ± calyxcorolla generally conspicuous; petals overlapped in free or 2 lowermost ± fusedstamens 10 (or 5, 6, 7, 9), generally ±  1- or 2-pinnate (less often  or palmately compound)

2. Flower ±  to ± sepals fused only at very base;  1- or 2-pinnate ..... Group 2: Caesalpinioideae (except Cercis)

2' Flower sepals free to ± entirely fused , 1-pinnate, or 

3. Upper petal (banner) inside lateral ones (wings) in stamens free  or bi-lobed ..... Group 2: Caesalpinioideae (Cercis only)

3' Upper petal (banner) outside lateral ones (wings) in  (only banner present in Amorpha, petal position not evident in some Dalea); stamens generally with all or 9 filaments fused (free in Thermopsis, Pickeringia, Calia);  1-pinnate (leaflets often 3), some palmately compound (especially Lupinus) or  ..... Group 3: Papilionoideae

Group 1: Mimosoideae

1. Stamens 10; 1° leaflets generally 2–4 ..... PROSOPIS

1' Stamens > 10; 1° leaflets generally > 4, or  

2. Filaments fused below, free above;  2-pinnate

3. Inflorescence  spike-like racemes or ± terminal  of head-like racemes;  with a glandfruit not or slowly valves not recurving; ScV, CCo, SnFrB, SCoRO, SW ..... ALBIZIA

3' Inflorescence  heads without a glandfruit valves recurving; DSon ..... CALLIANDRA

2' Filaments free 2-pinnate or 

4. Plant unarmed ..... ACACIA (2)

4' Plant armed with prickles or stipular spines

5. Plant armed with prickles ..... SENEGALIA

5' Plant armed with stipular spines

6. Leaf  ..... ACACIA (2)

6' Leaf 2-pinnate ..... VACHELLIA

Group 2: Caesalpinioideae

1. Leaf corolla pink-purple ..... CERCIS

1' Leaf compoundcorolla generally ± yellow

2. Leaf 1-pinnate, plant unarmed or main  axis generally > 2 cm, a weak spine at tip; corolla generally yellow ..... SENNA

2' Leaf generally 2-pinnate (both 1- and 2-pinnate in some), plant armed, main  axis generally < 2 cm (except Gleditsia), a strong spine at tip, or (if leaf interpreted as 1-pinnate; see Parkinsonia), leaf subtended by a strong spine generally < 2 cm and main leaf axis not a spine at tip; corolla ± yellow to orange, less often ± red or with orange to ± red marks

3. Flower ± 3–5 mm; sepalspetals ± alike in color, texture; plant tree, generally armed ..... GLEDITSIA

3' Flower > 5 mm; sepalspetals not alike in color, texture; plant  herbshrub, small treearmed or not

4. Plant unarmed

5. Shrub, small tree, < 4 m; 2° leaflets 14–22 ..... CAESALPINIA (2)

5' Perennial herbshrub, < 30 cm or < 2.5 m; 2° leaflets 3–13 ..... HOFFMANNSEGGIA

4' Plant armed

6. Plant with scattered pricklessepals not alike; fruit  ..... CAESALPINIA (2)

6' Plant with stipular spines at  or thorns in  axils (see leaf scars) or main leaf axis a strong spinesepals alike; fruit  to partly  late ..... PARKINSONIA

Group 3: Papilionoideae

1. Shrub to tree

2. Plant generally armed with pricklesspines, or thorns

3. Leaves , sometimes small or falling early

4. Plant gland-dotted; corolla indigo blue to pink-purple; seed 1 ..... PSOROTHAMNUS (4)

4' Plant not gland-dotted; corolla yellow to ± red; seeds (1)2–several

5. Corolla red-purple; fruit narrowed between seedsglabrous ..... ALHAGI

5' Corolla yellow; fruit not narrowed between seeds, densely hairy ..... ULEX

3' Leaves all or mostly compound, generally persistent

6. Leaf  or palmately compound; all filaments free ..... PICKERINGIA

6' Leaf pinnately compound; all or 9 filaments fused

7. Plant gland-dotted; fruit seed 1 ..... PSOROTHAMNUS (4)

7' Plant not gland-dotted; fruit  (sometimes slowly so); seeds generally several

8. Leaf even-pinnate; corolla wings purple-pink suffused with white, bannerkeel yellow-white to pink or purple; fruit not flat, generally narrowed between seeds ..... OLNEYA

8' Leaf odd-pinnate; corolla white or pink; fruit flat, not narrowed between seeds ..... ROBINIA (2)

2' Plant unarmed

9. Petal 1 (the banner) – inflorescence spike-like; fruit seed 1 ..... AMORPHA

9' Petals 5

10. Filaments all fusedleaves  or ternately or palmately compound

11. Leaves , < 2.5 cm; stems generally ± leafless ..... SPARTIUM

11' Leaves  or generally compound, generally > 2.5 cm; stems leafy

12. Leaf of 3–17 leafletspalmately compoundcorolla blue, purple, white, or yellow, banner glabrous to densely hairy, keel generally beaked ..... LUPINUS (2)

12' Leaf of 1–3 leaflets, appearing  or not; corolla yellow or white, banner generally glabrouskeel 

13. Style generally abruptly curved at ± middle or gently curved ± throughout; upper lip of calyx ± 2-lobed ..... CYTISUS

13' Style ± abruptly bent at tip; upper lip of calyx 2-lobed ..... GENISTA

10' Filaments all free or 9 fused, 1 (uppermost) free or 0; leaves generally odd-pinnately compound (or  number, arrangement generally irregular, as sometimes in Acmispon)

14. Inflorescence generally an  or flowers 1–2; corolla generally yellow ..... ACMISPON (3)

14' Inflorescencecorolla yellow or not

15. Corolla yellow with dark marks; fruit papery, inflated ..... COLUTEA

15' Corolla white or pink to purple; fruit not papery, not inflated

16. Flower 6–10 mm; plant gland-dotted; fruit seed 1 (see also Marina) ..... PSOROTHAMNUS (4)

16' Flower 14–25 mm; plant not gland-dotted; fruit  or not; seeds several

17. Fruit , flat, not narrowed between seedsfilamentsfused, 1 freecorolla ± white to pink ..... ROBINIA (2)

17' Fruit , not flat, ± narrowed between seedsfilaments all freecorolla ± blue-purple ..... [Calia secundiflora]

1' Annualbiennial herbvinesubshrub

18. Leaflets 0, but stipules leaflet-like –  axis ending as a tendril ..... [Lathyrus aphaca]

18' Leaflets 2–many

19. Leaf palmately compoundleaflets generally 3–9

20. All filaments freecorolla yellow, 15–25 mm ..... THERMOPSIS

20' All or 9 filaments fusedcorolla not yellow or, if so, generally < 15 mm

21. Leaflets gland-dotted; fruit  or transversely seed 1

22. Leaves ±  or clustered near stem tips; leaflets  to oblanceolate or widely obovate; fruit  in calyx except for beak ..... PEDIOMELUM

22' Leaves caulineleaflets obovate to fruit  from calyx ..... LADEANIA

21' Leaflets not gland-dotted; fruit  or  through longitudinal suturesseeds generally several

23. Filaments of all stamens fusedleaflets generally 5–9,  ..... LUPINUS (2)

23' Filaments of 9 stamens fused, the 10th (uppermost) freeleaflets 3–5, , toothed, or wavy

24. Leaflets 3–9, lower 2 in stipular position or not, others ± palmately arranged, stipules gland-like, reduced to bumps, or inconspicuous, inflorescence an  or 1–3-flowered, corolla generally yellow (see also Acmispon) ..... LOTUS

24' Leaflets generally 3, lower 2 not in stipular position, stipules generally papery or membranous, not reduced to bumps, not inconspicuous, rarely leaflet-like, if so then inflorescence not an  and corolla not yellow

25. Leaflet fruit not enclosed in corolla ..... ASTRAGALUS (3)

25' Leaflet ± toothed or wavy; fruit generally enclosed in corolla ..... TRIFOLIUM (2)

19' Leaf pinnately to subpalmately compound (axis apparent beyond lowermost leaflets), leaflets 2–many

26. Leaflets 2; main  axis ending as tendril or bristle ..... LATHYRUS (2)

26' Leaflets >= 3; main  axis ending as tendril, or bristle

27. Leaflets 3; fruit generally  (generally  in Phaseolus)

28. Keel petals spirally coiled;  generally lobed – trailing or twining vine ..... PHASEOLUS

28' Keel petals not spirally coiled;  , toothed, or wavy

29. Leaflet toothed or wavy – fruit  or , generally 1-seeded, or ± coiled, several-seeded

30. Corolla persistent, enclosing fruit, yellow, 3.5–5 mm ..... TRIFOLIUM (2)

30' Corolla deciduous, yellow or not, 3.5–5 mm or not

31. Fruit spirally coiled (or sickle-shaped or straight), generally prickly; seeds 1–several ..... MEDICAGO (2)

31' Fruit not spirally coiled, not prickly; seeds 1–2

32. Fruit , ridges generally net-like; corolla 2–3 mm ..... MEDICAGO (2)

32' Fruit , ridges transverse to finely net-like; corolla 2.5–7 mm ..... MELILOTUS

29' Leaflet not toothed, not wavy

33. Plant not gland-dotted; seeds generally 2–several; fruit  from calyx or  except for beak

34. Inflorescence an fruit  from calyx or  except for beak ..... ACMISPON (3)

34' Inflorescencefruit  from calyx ..... ASTRAGALUS (3)

33' Plant ± gland-dotted; seed 1; fruit generally  in calyx except for beak

35. Corolla cream to yellow; calyx conspicuously swollen in fruit ..... RUPERTIA

35' Corolla at least partly blue to purple; calyx swollen or not in fruit

36. Calyx swollen in fruitbracts at each , especially lower, of inflorescence united into fan-shaped, 3–5 toothed  ..... BITUMINARIA

36' Calyx not (or only ±) swollen in fruitbracts at  of inflorescence not united ..... HOITA

27' Leaflets > 3 on all or most leavesfruit  or not

37. Leaf even-pinnate, main axis ending as a bristle or tendril or not

38. Leaflets ± 20–60; fruit 4–8 cm or 15–20 cm; plant annualshrub, small tree ..... SESBANIA

38' Leaflets < 30; fruit generally < 8 cm; plant annual herb

39. Stipules leaflet-like, often > leafletsstyle longitudinally folded; leaflets 4–6, glabrous ..... PISUM

39' Stipules generally not leaflet-like but sometimes ± = leafletsstyle not longitudinally folded; leaflets 4–many, hairy or glabrous

40. Style ± flat,  near ± middle for ± 1/3–1/2 length adaxially; leaflets ± rolled in  ..... LATHYRUS (2)

40' Style generally not ± flat,  at tip, all around or especially abaxially; leaflets folded in  ..... VICIA

37' Leaf odd-pinnate, main axis ending as a 

41. Corolla wings << keelleaflets adaxially finely red-dotted; fruit 1-seeded, leathery, strongly net-ridged ..... ONOBRYCHIS

41' Corolla wings ± = keelleaflets adaxially dark gland-dotted or not, not red-dotted; fruit not simultaneously 1-seeded, leathery, and strongly net-ridged

42. Plant gland-dotted on stemsleaflets, or both; fruit 

43. Fruit several-seeded, long-exserted from calyxglabrous or with bristles or pricklesleaflets 6–10 mm wide ..... GLYCYRRHIZA

43' Fruit 1-seeded,  in calyxglandularleaflets generally < 6 mm wide

44. Petals from receptaclestamens 10; inflorescence head-like or not ..... PSOROTHAMNUS (4)

44' Petals, except banner, from side or top of  of fused filamentsstamens 5 or 9–10; inflorescence not head-like

45. Plant  to 

46. Stem gland-dotted ..... DALEA (2)

46' Stem not gland-dotted ..... MARINA (3)

45' Plant  to 

47. Inflorescencedense stamens 5 ..... DALEA (2)

47' Inflorescence an open stamens 9–10 ..... MARINA (3)

42' Plant not obviously gland-dotted; fruit  or not

48. Flowers 1–2 or several to many in 

49. Stipules gland-like, often not apparent; fruit  or not,  to  ..... ACMISPON (3)

49' Stipules conspicuous, scarious or leaflet-like; fruit , generally  to 

50. Inflorescence generally 10–20-flowered fruit segments 1–12 ..... CORONILLA

50' Inflorescence several-flowered  or 1–2-flowered; fruit segments 0 ..... HOSACKIA

48' Flowers (1–2 or) many in  to  that is head-like or not

51. Seed 1;  tip with glandinflorescencedense, ± 1 cm ..... MARINA (3)

51' Seeds several;  tip without glandinflorescence or dense or not, generally > 1 cm

52. Fruit , breaking into 1-seeded segmentscorolla 6–9 mm;  generally < 6 mm ..... ORNITHOPUS

52' Fruit generally  (sometimes slowly so), not breaking into 1-seeded segmentscorolla often > 9 mm;  often > 6 mm

53. Style tip or stigma finely hairy; stipules spiny, free ..... PETERIA

53' Style tip and stigma glabrousstipules not spiny, free or fused

54. Keel tip rounded to  (or short-beaked); fruit 1-chambered, if ± 2-chambered then septum from lower suture, rarely fusing with narrow flange from upper suture ..... ASTRAGALUS (3)

54' Keel tip beaked; fruit ± 2-chambered, septum from upper suture, partial to complete ..... OXYTROPIS

 

Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, http://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 .

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.