Jepson eFlora: Key page
Vascular Plants of California
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Key to Polygonaceae

View taxon page for Polygonaceae

 

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

1. Ocreae present, persistent or not;  generally swollen; flower cluster not subtended by  all subtended by 2+ fusedmembranous, wide bractlets (Polygonoideae)

2. Perianth parts (5)6 (Rumiceae)

3. Flowers unisexual, outer perianth parts of pistillate flower spine-tipped in fruit ..... EMEX

3' Flowers generally , outer perianth parts not spine-tipped in fruit ..... RUMEX

2' Perianth parts 4–5

4. Perianth parts 4; fruit , 2-winged; leaves ±  ..... OXYRIA

4' Perianth parts 4–5; fruit generally ovoidleaves generally cauline

5. Vine-like shrubperianth in fruit fleshy (Coccolobeae) ..... MUEHLENBECKIA

5' Herb, or if shrub then not vine-like; perianth in fruit generally not fleshy (Polygoneae)

6. Outer perianth parts winged or keeled, or ± so

7. Flower base stalk-like; outer perianth parts winged (keeled in Fallopia convolvulus);   base , or ocrea papery, not 2-lobed distally ..... FALLOPIA

7' Flower base not stalk-like; outer perianth parts keeled  base  (ovate); ocrea generally translucent, 2-lobed distally ..... POLYGONUM (2)

6' Outer perianth parts not winged or keeled

8. Leaves generally inflorescence terminal, spike-like; stems not branched ..... BISTORTA

8' Leaves caulineinflorescence terminal, spike-like or not; stems generally branched

9. Ocreae generally translucent, glabrous, 2-lobed,  in age ..... POLYGONUM (2)

9' Ocreae opaque, glabrous to scabrous, not 2-lobed

10. Inflorescence raceme- or panicle-like; perianth parts fused ± 1/4; stamens 8 ..... ACONOGONON

10' Inflorescence ± head-, spike-, or panicle-like; perianth parts fused 1/4–2/3; stamens 5–8 ..... PERSICARIA

1' Ocreae 0;  not swollen; flower clusters subtended by  of 1+ free or fused bracts (or not, in Gilmania);  each often subtended by 2 free, transparent,  bractlets (Eriogoneae-Eriogonoideae)

11. Involucre  1, inflated,  0; leaves generally lobed; stamens 6 (Pterostegiinae) ..... PTEROSTEGIA

11' Involucre 0 or tubular or of 2–5 ± free bracts, not inflated, awned or not; leaves stamens 3–9 (Eriogoninae)

12. Annual to shrub, if annual then  tubular, awnless

13. Involucres of 2–5 awnless bracts ..... DEDECKERA

13' Involucres tubular ..... ERIOGONUM

12' Annualinvolucres tubular and awned or of free or basally fused bracts, awned or not, 0 in Gilmania

14. Leaves  and cauline ..... GOODMANIA

14' Leaves  or if cauline then  or 

15' Involucre present

16. Involucres of free or basally fused bracts

17. Stamens 3

18. Perianth  leathery;  bracts 3, awned ..... LASTARRIAEA

18' Perianth  petal-like;  bracts many, awnless ..... NEMACAULIS

17' Stamens 6 or 9

19. Involucre bracts 3(4), awned; plant  ..... HOLLISTERIA

19' Involucre bracts 4–7, awnless; plant silky-puberulent ..... JOHANNESHOWELLIA

16' Involucres tubular

20. Involucre funnel- to bell-shaped, not angled, not ridged

21. Involucre  5(6); perianth  3-lobed to  ..... SIDOTHECA

21' Involucre  (3)4(5) or 7–36; perianth  generally 

22. Involucre  4(5) or generally 7–30(36) ..... ACANTHOSCYPHUS

22' Involucre  (3)4 ..... OXYTHECA

20' Involucre generally ± , angled or not, ridged or not

23. Bracts generally 2, , or many, ; flowers 1(2) ..... CHORIZANTHE

23' Bracts 3, , on 1 side of branch or not; flowers (1)2–6

24. Involucre teeth 5,  at tips; flowers 4(6) ..... ARISTOCAPSA

24' Involucre teeth 2–4 or 6, if 5 then  both at base of  and at tips of teeth; flowers (1)2–3

25. Involucre not awned basally

26. Flower hairy; bracts below  obvious; involucre teeth unequal ..... MUCRONEA

26' Flower glabrous, bumpy; bracts below  obscure; involucre teeth equal ..... SYSTENOTHECA

25' Involucre awned basally

27. Involucre 3-angled,   3, terminal (on teeth) 5; flowers 2 ..... CENTROSTEGIA

27' Involucre 6-angled,   6, terminal (on teeth) 6; flowers 3 ..... DODECAHEMA

 

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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 .

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