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Payl:Alsomitra macrocarpa seed (syn. Zanonia macrocarpa).jpg

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Deskripsyon

Kebun Raya, Bogor, Indonesia.

A bit of flowery prose from an essay that I wrote in 2001 on wind-dispersed seeds & fruits:

"Every now and then, field botanists are treated to transcendental moments when the light is golden, the air is fresh, interesting plants are at hand, and the hardships of field work just melt away. During those times, scientific insights arrive with astonishing clarity and grace. One such moment for me came on a sunny afternoon in the Kebun Raya Botanic Garden, in Bogor, Indonesia, some years ago. On that memorable day, I was transfixed as I watched dozens of winged seeds of Alsomitra macrocarpa (Cucurbitaceae, the squash family) glide to the ground in broad, lazy spirals. The seeds spilled out from a fruit hanging on the liana climbing on one of the enormous old trees in the garden. All the principles of aerodynamics as they relate to seed dispersal were manifest in that one lovely moment.

"The gliding seeds of Alsomitra exhibit two kinds of motion: The forward gliding motion, which takes the seed on a helical, downward path, and phugoid oscillations, in which the gliding seed gains lift, stalls, drops briefly until it accelerates enough to generate lift, starting the process over again. Phugoid oscillations are well known to aviation engineers and model airplane fliers, because they can destabilize mechanized flight, but in the seeds of Alsomitra, phugoid oscillations add a graceful rhythm to the descent, and more importantly, slow the descent of the seeds giving them more time aloft. Time aloft is the sine qua non of successful dispersal by wind."
Petsa
Gigikanan Alsomitra macrocarpa seed (syn. Zanonia macrocarpa)
Tagsulat Scott Zona from Miami, Florida, USA

Pagtugot

w:en:Creative Commons
atribusyon
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
Libre ka:
  • sa pagsabwag – sa pagkopya, pag-apod-apod ug pagsabwag sa hinimo
  • sa pag-remix – sa pag-adap sa binuhat
Ubos sa mosunod nga mga kondisyon:
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This image was originally posted to Flickr by scott.zona at https://www.flickr.com/photos/12017190@N06/5616740256. It was reviewed on 4 Mayo 2011 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

4 Mayo 2011

Pagtugot

w:en:Creative Commons
atribusyon share parehas
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Libre ka:
  • sa pagsabwag – sa pagkopya, pag-apod-apod ug pagsabwag sa hinimo
  • sa pag-remix – sa pag-adap sa binuhat
Ubos sa mosunod nga mga kondisyon:
  • atribusyon – Kinahanglan nimo nga hatagan ang angay nga kredito, maghatag usa ka link sa lisensya, ug ipakita kung adunay mga pagbag-o. Mahimo nimo kini buhaton sa bisan unsang makatarunganon nga paagi, apan dili sa bisan unsang paagi nga nagsugyot nga gi-endorso ka sa licensor o ang imong paggamit.
  • share parehas – Kung imong gi-remix, gibag-o, o gibase sa materyal, kinahanglan nimo nga iapod-apod ang imong mga kontribusyon sa ilawom sa parehas o katugma nga lisensya sama sa orihinal.
This image was originally posted to Flickr by scott.zona at https://www.flickr.com/photos/12017190@N06/5616740256. It was reviewed on 4 Mayo 2011 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

4 Mayo 2011

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Alsomitra macrocarpa

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publication date English: 13 Abril 2011

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13 Abril 2011

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