This week things got serious, though. Our orchids of interest, Cypripedium arietinum (ram's head orchid, fr: Cypripède tête-de-bélier), are finally blooming! This year they're blooming rather later than usual, as I have informal records going back several years showing the orchid flowering by May 17th -- they didn't start this year until May 22nd.
Here's what these little beauties look like:
|C. arietinum flower|
I actually took some photos that show the pollinia of C. arietinum, so let's take a look:
I've talked about floral deception before, but in a nutshell the flower lures pollinators in by signalling that it offers a reward (nectar), but once the pollinator arrives it discovers that it's been had, that there's no nectar reward at all. Being food deceptive allows a flower to reduce its investment of energy in pollinator attraction (it doesn't have to make nectar, which is costly), but being food deceptive also means that the flower gets a lot fewer visits, because the pollinators learn that this flower is a liar and not worth visiting.
|It's a pretty liar, though, eh? C. arietinum looking into the labellum|
Regardless of the delay in their flowering time this year, now that the orchids are blooming the intensive fieldwork starts. We set out several days this week to tag all of the flowering individuals (we're already up over 200 individual orchids), measure a suite of their characteristics, measure soil pH and moisture for each of them, take down canopy closure and other plot characteristics, and note the size of the flowering community around each individual. This is an enormous amount of work, as you might have guessed. And there are still at least 100 orchids left to go!
One of the best things about fieldwork, which I touched on briefly in my last post, is that making close observations out in the field can lead to new questions and new discoveries. For example, yesterday during my fieldwork I noticed something very odd and cool. It won't come as a complete surprise to my blog readers, as I have talked about mutations twice before. This time, no fasciation, but instead I found five two-flowered individuals in this species that generally only has one flower per stalk. Individuals producing more than one flower on the same stalk naturally have been documented in quite a few orchids, especially Cypripedium spp.; however, there are a number of possible reasons for the multiple flowers: stress-related growth malfunction? soil contamination growth malfunction? natural genetic mutation? natural morphological variation? When it comes right down to it, we don't currently know the cause.
Of these two-flowered individuals, there seemed to be two broad 'types'. The first is a two-flowered individual wherein the upper flower is right-side-up and the lower flower is upside-down. There were three of this type in one of our study plots. Here are some pictures:
|C. arietinum two-flowered individual. The upper flower is on the right, and the lower on the left.|
|C. arietinum two-flowered individual, from the other side -- the upper flower is on the left and the lower on the right|
|C. arietinum 2-flowered individual with both flowers correctly oriented|
|C. arietinum two-flowered individual showing the flowers up close|
I suppose I've had a good ramble through the orchid patch now and will get back to the title of this post, which is ostensibly the main point here. These lovely pictures don't convey one aspect of the season: blackflies! It is peak blackfly season, so it's absolutely brutal out there. We are all wearing bug hats and tucking our pants into our socks, our shirts into our pants, binding our cuffs with rubber bands, wearing gloves, and just about bathing in DEET because the blackflies are ravenous and exceptionally numerous. It takes a special sort of obsession to put up with them for ten hours a day!
I shared this video last year, but it's particularly apropos at the moment. Here's some delightful Canadiana about blackflies, sung by Wade Hemsworth and the McGarrigle Sisters and with animation by the national film board: