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Soliva sessilis
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Photographer: Aaron Schusteff
ID: 0000 0000 0507 0701 (2007-05-08)Copyright © 2007 Aaron Schusteff
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo May 8, 2007
location
San Pedro Mountain (San Mateo County, California, US)family
Asteraceae
notes Soliva sessilis is one of those composites which keys out under the 'disciform' group in the Jepson Manual. The flower heads occur in leaf axils and are sessile. One is seen here near the center of the image. I teased it open a bit so the achenes of the outer series of pistillate flowers would be more visible. One such achene is exposed and laid flat to the right and below the head (this didn't occur naturally...I set it up). These achenes are winged, and the tips of the achenes and wings are tapered to hard spines. The inner disc flowers (5 here) are staminate and their corollas have 4 lobes (rather than the usual 5 in Asteraceae). The outer pistillate series of flowers have no corollas. Note the tiny spiny tips on the leaflets. The leaves of this plant are fairly distinctive and easy to recognize once you get to know it. Also, if after sitting down you place your hand on this plant while pushing yourself up, you're likely to get a sharp stab from those achene spines. And achenes will probably be stuck into your clothing, pack, etc...which provides for effective dispersal. Unfortunately, this is a weedy alien originating in South America.camera Shot on a Canon Digital Rebel XT at f16, 1/4 sec, ISO 400, using a Canon 100mm macro lens.
photo category: Plant - annual/perennial
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MORE INFORMATION ABOUT THIS PLANT
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| Look for Jepson Manual treatments, maps (University & Jepson Herbaria)View Calflora record for Soliva sessilisView all photos in CalPhotos of Soliva sessilis Check Google Images for Soliva sessilis |
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The photographer's identification Soliva sessilis has not been reviewed. Sign in to review or comment on this photo |
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Using this photo The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2007 Aaron Schusteff.
For other uses, or if you have questions, contact Aaron Schusteff arbonius2[AT]sbcglobal.net. (Replace the [AT] with the @ symbol before sending an email.) |
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