This page has found a new home

Leaf of the day: More Crown Flower Sketches and Study

Blogger 301 Redirect Plugin /* Header ----------------------------------------------- */ @media all { #header { width:660px; margin:0 auto 10px; border:1px solid #ccc; } } @media handheld { #header { width:90%; } } #blog-title { margin:5px 5px 0; padding:20px 20px .25em; border:1px solid #eee; border-width:1px 1px 0; font-size:200%; line-height:1.2em; font-weight:normal; color:#666; text-transform:uppercase; letter-spacing:.2em; } #blog-title a { color:#666; text-decoration:none; } #blog-title a:hover { color:#c60; } #description { margin:0 5px 5px; padding:0 20px 20px; border:1px solid #eee; border-width:0 1px 1px; max-width:700px; font:78%/1.4em "Trebuchet MS",Trebuchet,Arial,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.2em; color:#999; } /* Content ----------------------------------------------- */ @media all { #content { width:660px; margin:0 auto; padding:0; text-align:left; } #main { width:410px; float:left; } #sidebar { width:220px; float:right; } } @media handheld { #content { width:90%; } #main { width:100%; float:none; } #sidebar { width:100%; float:none; } } /* Headings ----------------------------------------------- */ h2 { margin:1.5em 0 .75em; font:78%/1.4em "Trebuchet MS",Trebuchet,Arial,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.2em; color:#999; } /* Posts ----------------------------------------------- */ @media all { .date-header { margin:1.5em 0 .5em; } .post { margin:.5em 0 1.5em; border-bottom:1px dotted #ccc; padding-bottom:1.5em; } } @media handheld { .date-header { padding:0 1.5em 0 1.5em; } .post { padding:0 1.5em 0 1.5em; } } .post-title { margin:.25em 0 0; padding:0 0 4px; font-size:140%; font-weight:normal; line-height:1.4em; color:#c60; } .post-title a, .post-title a:visited, .post-title strong { display:block; text-decoration:none; color:#c60; font-weight:normal; } .post-title strong, .post-title a:hover { color:#333; } .post div { margin:0 0 .75em; line-height:1.6em; } p.post-footer { margin:-.25em 0 0; color:#ccc; } .post-footer em, .comment-link { font:78%/1.4em "Trebuchet MS",Trebuchet,Arial,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.1em; } .post-footer em { font-style:normal; color:#999; margin-right:.6em; } .comment-link { margin-left:.6em; } .post img { padding:4px; border:1px solid #ddd; } .post blockquote { margin:1em 20px; } .post blockquote p { margin:.75em 0; } /* Comments ----------------------------------------------- */ #comments h4 { margin:1em 0; font:bold 78%/1.6em "Trebuchet MS",Trebuchet,Arial,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.2em; color:#999; } #comments h4 strong { font-size:130%; } #comments-block { margin:1em 0 1.5em; line-height:1.6em; } #comments-block dt { margin:.5em 0; } #comments-block dd { margin:.25em 0 0; } #comments-block dd.comment-timestamp { margin:-.25em 0 2em; font:78%/1.4em "Trebuchet MS",Trebuchet,Arial,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.1em; } #comments-block dd p { margin:0 0 .75em; } .deleted-comment { font-style:italic; color:gray; } /* Sidebar Content ----------------------------------------------- */ #sidebar ul { margin:0 0 1.5em; padding:0 0 1.5em; border-bottom:1px dotted #ccc; list-style:none; } #sidebar li { margin:0; padding:0 0 .25em 15px; text-indent:-15px; line-height:1.5em; } #sidebar p { color:#666; line-height:1.5em; } /* Profile ----------------------------------------------- */ #profile-container { margin:0 0 1.5em; border-bottom:1px dotted #ccc; padding-bottom:1.5em; } .profile-datablock { margin:.5em 0 .5em; } .profile-img { display:inline; } .profile-img img { float:left; padding:4px; border:1px solid #ddd; margin:0 8px 3px 0; } .profile-data { margin:0; font:bold 78%/1.6em "Trebuchet MS",Trebuchet,Arial,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.1em; } .profile-data strong { display:none; } .profile-textblock { margin:0 0 .5em; } .profile-link { margin:0; font:78%/1.4em "Trebuchet MS",Trebuchet,Arial,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.1em; } /* Footer ----------------------------------------------- */ #footer { width:660px; clear:both; margin:0 auto; } #footer hr { display:none; } #footer p { margin:0; padding-top:15px; font:78%/1.6em "Trebuchet MS",Trebuchet,Verdana,Sans-serif; text-transform:uppercase; letter-spacing:.1em; } /* Feeds ----------------------------------------------- */ #blogfeeds { } #postfeeds { }

Tuesday 28 April 2009

Leaf of the day: More Crown Flower Sketches and Study

Today more sketches of the Crown Flower, trying to concentrate while I listen with growing dismay to the swine flu reports. I am trying to be optimistic as in a week's time I am due to fly home to the UK for a long visit...most of May. I am so looking forward to it, so I am just thinking positive.

I was looking in more detail at the flower head and the leaves. The structure of the flower is so odd. There are 5 sepals only seen from the underneath of the flower, then 5 petals which do at least look like petals. Then the central "crown" part which consists of 5 stamens, the buttress like structures, which are joined with the filaments to form a structure called a "gynostegium", a fusion of the male and female parts of the flower.
This superb photo of a White Crown Flower by G D Carr from the Hawaii Education dept here shows the top of the crown, where you can see 5 little black points.



These I think are called the glands and if you can get a scalpel in at this point you might be able to extract the "pollinia". These are the structures which hold the pollen, not loose pollen as we usually imagine, but flat waxy pollen drops, in pairs, attached to the gland.

Here is the scan I took yesterday after I had found the pollinia. It is tiny, just 2mm long, but scanning it at high res did give me a reasonable result.


Crown Flower Pollinia

Somehow... and I am still not entirely clear how this works with this particular flower, an insect has to attach one of these to its leg and transport it to another flower.

If you are interested in milkweeds, there is a stunning web page by Brian Johnston with wonderful macro/micro photos and a clear explanation of the intricate process of the pollination of the Common Milkweed Asclepias syriaca here. The milkweed structures are all basically similar but I think I might email him to ask if he can explain exactly how it works with this particular flower... How does the insect (probably one of the red milkweed bugs) get these particular pollen sacks on its leg???. I had to work quite hard to get the thing out, but then, as we say in Lincolnshire, I probably wasn't holding my mouth right.. :)
_________________________________________________________

More Crown Flower Sketches








Labels: , , , , ,

3 Comments:

Blogger Sandra said...

I've never seen that flower ('course not - I live in Michigan, right?) But it is beautiful - so unique. You have done a wonderful job in your study of it. And your photo is beautiful, too.
Are you a specialist in botanical illustrations?

28 April 2009 at 14:09  
Blogger Gabrielle said...

Thank you for sharing your sketches, color studies, pieces in progress, and the final masterpieces. They are all beautiful and inspirational and I learn so much from seeing the process.

3 May 2009 at 06:54  
Blogger Shady Gardener said...

I love the crown on the crown flower! :-) Nice job!!

5 May 2009 at 03:52  

Post a Comment

Subscribe to Post Comments [Atom]

<< Home