Viola nuttallii

Nuttall's Yellow Violet

Dunnet Regional Park
25-April-1998

Plants with leaf blades mostly truncate to subcordate at base and obtuse at apex are sometimes known as Viola vallicola, although this is probably just a variety of nuttallii.

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Nuttallii Characteristics
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native perennials

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plants appearing stemless, but actually caulescent

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leaves not deeply divided

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leaf blades cuneate at base, tapering into the petiole

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basal leaves lanceolate, nearly entire

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stipules bract-like (not leaf-like)

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first peduncles from base of the stem

 
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Viola Characteristics
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leaves simple, basal or alternate, bearing stipules

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two kinds of flowers:

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Spring Flowers
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showy 

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cross-fertilizing

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perfect

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irregular in shape

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5 persistent sepals, auricled at the base

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5 petals

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lowest petal prolonged into a spur, sometimes bearded at the throat

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the 2 lateral petals frequently bearded at the base

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5 stamens, filaments extending beyond the anthers

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1 pistil, style extending beyond the stamens

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Summer Flowers
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remaining closed

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self-fertilizing (cleistogamous)

 
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Violaceae Characteristics
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terrestrial herbs

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plants not with coloured milky juice

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plants with more than one leaf, some or all of which are alternate

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leaves with stipules

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calyx regular

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corolla irregular, 5 separate petals, with one petal spurred or sac-like

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5 stamens alternating with petals

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stamens usually separate or at least partly so, not united in a column

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one compound ovary, superior and 1-loculed

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fruit a 3-valved capsule