Psilostrophe cooperi [Cooper's Paperflower]

[Andrea B.]

Blum, A.G. (2013) Psilostrophe cooperi (A. Gray) Greene (Asteraceae) Cooper's Paperflower. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...rs-paperflower/

 

Boyce Thompson Arboretum, Superior, Arizona, USA

N33°16'48.3" W111°09'31.5"

23 April 2013

Wildflower in botanical garden

 

Synonyms:

• Whitestem Paperflower
• Paper Daisy
• Riddellia cooperi A. Gray

 

Other Common Names:

• Paperflower
• Paper Daisy
• Whitestem Paperflower

 

Comment: The notched rays become very dry and papery as they age, remaining on the plant for months. This plant is native to the US. In UV the corolla is very UV-absorbing but also shows some directional iridescence.

 

Reference:

1. Epple, A.O. (1995) A Field Guide to the Plants of Arizona. Cooper's Paperflower, page 287. Falcon Guides, Globe Pequot Press, Guilford, CT.

2. SEINet Arizona-New Mexico Chapter (acc 20 Jan 2022) Psilostrophe cooperi.

This is a southwestern biodiversity organization making use of the Symbiota portal software.

 

Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Visible Light [f/8 for 1/640" @ ISO 200 in Sunlight with Baader UVIR-Block Filter]

 

Ultraviolet Light [f/8 for 1/60" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

 

Visible Light [f/11 for 1/500" @ ISO 200 in Sunlight with Baader UVIR-Block Filter]

 

Ultraviolet Light [f/8 for 1/80" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

[nfoto]

Judged from the ray flowers, it has recently rained.

[Andrea B.]

It is possible that the spots are from irrigation sprinklers in this botanical garden.