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Platanthera chlorantha


Platanthera chlorantha
Photo Information
Copyright: anita and mike allsopp (juanit) Gold Star Critiquer/Gold Note Writer [C: 58 W: 5 N: 270] (1522)
Genre: Plants
Medium: Color
Date Taken: 2010-06-05
Categories: Flowers
Camera: Canon 400D, Tamrom 90mm f2.8 DI
Exposure: f/11, 1/100 seconds
Details: Tripod: Yes
More Photo Info: [view]
Photo Version: Original Version
Theme(s): Orchids of Europe, Orchids of Great Britain [view contributor(s)]
Date Submitted: 2010-06-06 15:07
Viewed: 3939
Points: 2
[Note Guidelines] Photographer's Note
Greater Butterfly-orchid
Platanthera chlorantha
previously: Habenaria chlorantha and Habenaria virescens

IDENTIFICATION:
Plants growing in the open are robust, while those in shaded woodland are taller and more slender. The flower spike, 20-60 cm tall, has two large, elliptical, shiny, bluish-green basal leaves and up to five smaller, pointed stem leaves. There are 10-40 white flowers in an open spike, the flowers borne well away from the stem on S-shaped ovaries. The ovate, wavy-edged lateral sepals spread outwards and downwards, the smaller upper sepal and two petals forming a broad, semicircular hood. The translucent lip is long and strap-shaped with a greenish tip, the spur at the base being up to 25 mm long, lying right across the flower spike and curving slightly downwards. The two pollinia diverge and are set wide apart at the base of the column, giving a clear view down into the spur. The scent is sweet and strong, particularly at night. The white flowers are highly reflective and show up well in dim light.

CONFUSING SPECIES:
Lesser Butterfly-orchid is very similar, but the two pollinia are parallel and lie close together, obscuring the entrance to the spur. Aberrant flowers are not uncommon: some lack both lip and spur, others have no lateral sepals but a sepaloid lip with no spur, yet others have a spur but no lip. Flowers with all three petals resembling a lip, complete with spur, have been recorded in Skye.

HYBRIDS:
Hybrids between the two butterfly-orchids have been confirmed in Scotland. The so-called hybrid with Small-white Orchid in Scotland proved to be a peloric Greater Butterfly-orchid.

HABITAT
Most commonly found on well-drained, calcareous soils, on downland, old pastures, hill hay meadows, woodland such as that on the heavier soils below chalk hills, and occasionally in calcareous sand dunes. Rarely found on slightly acid moorland.

POLLINATION
Although bumblebees visit the flowers, they have too short a proboscis to reach the nectar in the spur. Pollinators include Silver-Y moth and Elephant and Small Elephant Hawk-moths. Seed is set in 70-90% of capsules.

CONSERVATION
Many sites were lost to woodland clearance and the improvement of upland pastures during the last century. The development of a dense woodland canopy suppresses flowering, but subsequent clearance can lead to a dramatic reappearance of hundreds of flower spikes, even after an interval of more than 50 years.

DISTRIBUTION:
Widely distributed in southern England,Wales, north-west England, western Scotland and the northern half of Ireland. It is absent from Orkney, Shetland and the Outer Hebrides.

Height: up to 60cm
No. of flowers: up to 40

FLOWERING PERIOD:
May to July

This is a link to BritainsOrchids


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To blakitan: Thankyoujuanit 1 07-12 14:06
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Critiques [Translate]

Very pretty flowers, with some insects on them.
It seems colors are a bit pale ... may need to adjust saturation slightly.

Regards,
Ben

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