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Flowers with 1 petal (very rare) White Calla Lily Lilies have 6 petals; Fusing of petals.

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Presentation on theme: "Flowers with 1 petal (very rare) White Calla Lily Lilies have 6 petals; Fusing of petals."— Presentation transcript:

1 Flowers with 1 petal (very rare) White Calla Lily Lilies have 6 petals; Fusing of petals

2 Flowers with 2 petals (very rare) Euphobia

3 Flowers with 2 petals (very rare) Can still be found in Singapore: photo taken outside a HDB flat

4 Flowers with 3 petals (quite rare) WaterplantainTrillium

5 Flowers with 5 petals (very common) Taken in Singapore Hibiscus

6 Bougainvillea: which one is the flower? Pink flower: 3 bracts or modified leaves; light-yellowish flower in centre has 5 petals; actually there are 3 flowers in centre

7 Columbine: How many petals? 5 petals & 5 sepals (modified petals) Most of the times, sepals look exactly like petals

8 Daffodil: How many petals? 3 petals & 3 sepals (modified petals)

9 Flowers with 8 petals (quite rare) Bloodroot Yellow Moonbeam Coreopsis

10 Daisies with 13 petals (quite rare) Black-eyed Susan Orange Zinnia

11 Daisies with 21 petals (quite rare) Shasta Daisy Petals are bracts or modified leaves; flowers in centre; Composite Flower

12 Daisies with 34 petals (quite rare) Field DaisyWhite Daisy

13 Flowers with 34 petals (quite rare) Sunflower Petals are bracts or modified leaves; flowers in centre; Composite Flower

14 Exceptions Ixora Daylily

15 Exceptions Starflower Passion Flower

16 Exception Type 1 Some flowers follow Lucas Sequence: 2, 1, 3, 4, 7, 11, 18, 29, … Like Fibonacci sequence except first 2 terms are 2 and 1, instead of 1 and 1 Fibonacci: 1, 1, 2, 3, 5, 8, 13, 21, 34, … E.g. 4 petals and 7 petals

17 Flowers with 4 petals Ixora: Taken in Singapore

18 Flowers with 7 petals Starflower

19 Exception Type 2 Doubling of the petals: e.g. from 3 to 6 petals; from 5 to 10 petals

20 Flowers with 6 petals Daylily 3 petals & 3 sepals We just use laymans term: 6 petals. Why? Or else problem with daisies and sunflower

21 Flowers with 6 petals Iris 3 petals & 3 sepals

22 Orchid: 6 petals Vanda Miss Joaquim Singapore National Flower 2 petals, 3 sepals, 1 lip (modified petal)

23 plants/van/pla-van- van.shtml Orchid: 6 petals Learn more about Singapore National Flower:

24 Orchid: 6 petals NTUs own flower: Dendrobium Nanyang

25 Orchid: How many petals? 2 petals & 3 sepals? Lip not obvious or no lip (hybrid)

26 Flowers with 10 petals Passion Flower Probably 5 petals & 5 sepals

27 Exception Type 3 Mutations and hybrids that have been created artificially also account for exceptions

28 Marsh Marigold: 5 or 6 petals? The 6-petal flower is a mutant

29 4 or 5 petals? Taken in Singapore The 4-petal flower is a mutant

30 Roses: How many petals? Hybrids: many petals

31 Wild Roses: How many petals? 5 petals

32 Are you sure there is a pattern? Fibonacci: 1, 2, 3, 5, 8, 13, … Lucas: 4, 7, 11 (we havent seen 11 petals) Doubling (even nos.): 6, 10, 12, 14, 16, … (we havent seen 12, 14, 16, … petals) Petals: 1-8, (cover most numbers!) If can find 9 or 15 petals, this is rubbish!

33 So where is the Fibonacci pattern? The Fibonacci pattern comes mainly from daisies: 13, 21, 34, 55 or 89 Botanists may disagree because some petals are actually sepals or bracts But we go by what we laymen see. Why?

34 So where is the Fibonacci pattern? E.g. if nature has fused the 3 petals and the 3 sepals of the White Calla Lily into 1 petal, why call it 3 petals?

35 The Internet Search for 9 Petals… Marsh Marigold: 5-9 deep yellow petals But mostly 5 petals 6-petal is a mutant 5-9 sepals; no petals Website can be wrong

36 The Internet Search for 9 Petals… Lesser Celandine: 5-9 yellow petals But mostly 8 petals Website can be wrong or the rest are mutants

37 The Internet Search for 9 Petals… Mayapple: 6-9 petals But mostly 6 petals Website can be wrong or the rest are mutants

38 The Internet Search for 9 Petals… Royal Ramparts: 9 deep red-purple petals Japanese Iris Nursery Probably a hybrid

39 The Internet Search for 9 Petals… Áashild Kalleberg: 8-9 petals & 3 sepals Website says it is a hybrid Some sites on dried flower arrangements Conclusion: Flowers with 9 petals are either mutants or hybrids Websites are not always reliable

40 Websites on Fibonacci Numbers ccins.camosun.bc.ca/~jbritton/fibslide/jbfibslide. htm (contains other patterns as well) ccins.camosun.bc.ca/~jbritton/fibslide/jbfibslide. htm library.thinkquest.org/27890/applications5.html

41 How many ridges in a banana? Hint: It is a Fibonacci number ridge


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