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1. Every Friday post a photo that includes one or more flowers.
2. Please only post photos you have authority to use.
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Thursday, 24 December 2015

FFF214 - PONTEDERIA

Pontederia cordata, common name pickerelweed (USA) or pickerel weed (UK), is a monocotyledonous aquatic plant native to the American continent. It grows in a variety of wetlands, including pond and lake margins across an extremely large range from eastern Canada south to Argentina. A few examples include northern rivers, the Everglades and Louisiana.

The species grows as an emergent plant, that is, in flooded conditions, so the plant is generally dependent upon aerenchyma in the stem to carry oxygen into the roots. Its metabolism, is, however, also tolerant of low soil oxygen. It is often found in areas where water levels fluctuate naturally, with spring flooding and later summer emergence. Apart from flooding, the species is also influenced by soil fertility, tending to grow in the more fertile bays of large lakes, for example. Like many aquatic plants, it is negatively affected by salinity and grazing. It is also negatively affected by competition from other wetland plants. Like many wetland plants, it can survive unfavourable conditions as buried seeds in the soil.

The plant flowers in late summer. The purple flowers have yellow markings which may assist in attracting bees for pollination. One bee species known to pollinate the flowers is Dufourea (Halictoides) novaeangliae. Once the plant begins to produce seeds, the stem supporting the inflorescence bends to submerse the fruits and seeds. Seeds are dormant at the time of dispersal and will not germinate without stratification for 6-8 weeks.

The flowers of the species are tristylous, meaning the styles of individual plants occur in three different morphs, with most populations containing all three. Leaf shape, which varies considerably across populations, within populations, and even within individuals, has been the source for many taxonomic synonyms. Like many wetland and aquatic plants, the species can reproduce asexually by means of branching rhizomes, and hence can form large clonal stands. This plant is cultivated as an ornamental garden plant, and has gained the Royal Horticultural Society's Award of Garden Merit.

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MY BEST WISHES FOR THE FESTIVE SEASON! MERRY CHRISTMAS TO ALL WHO CELEBRATE IT.

10 comments:

  1. Merry Christmas "Saint Nick."

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  2. Love the color of this plant 9don't think I've ever seen). A merry Christmas to you!

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  3. Gorgeous! The flower of the plant reminds me of the flowers of lamb's ear.

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  4. Hi Nick, I am on vacation but was able to get on wi-fi to link up this morning. Very happy about that! Merry Christmas!

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  5. Another new one to me, and so beautifully photographed. Merry Christmas!

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  6. Merry Christmas!
    https://ladyleemanila.wordpress.com/2015/12/26/rudbeckia/

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  7. Very pretty purple flowers! I hope you had a fairy, merry Christmas, too.

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