Hymenopappus tenuifolius [Chalk Hill Woollywhite]

[Andrea B.]

Blum, Andrea (2022) Hymenopappus tenuifolius Pursh 1813 (Asteraceae) Chalk Hill Woolywhite. Flowers photographed in Visible, Infrared and Ultraviolet light. LINK

 

Avenida Torreon, Eldorado at Santa Fe, Santa Fe, New Mexico, USA

23 May 2020

Wildflower

 

Comment:

These Woollywhite flower heads are discoid and have no rays. The scales attached to the seeds are membranous, giving the flower its Greek genus name.

 

References:

1. SEINet Arizona-New Mexico Chapter (acc 22 Mar 2021) Hymenopappus tenuifolius. This is a southwestern biodiversity organization making use of the Symbiota portal software.

2. Allred, Kelly W., Jercinovic, Eugene M., Ivey, Robert DeWitt (2021) Flora Neomexicana III: An Illustrated Identification Manual, Second Edition, Part 2, Hymenopappus Key, page 162. Print on demand at lulu.com.

 

 

Habitat photos made with Nikon D850 + Micro-Nikkor 60/2.8G ED AFS.

 

The rayless, pale yellow to whitish discoid flowers spread out at the end of a tall, sturdy, central stem.

 

 

The filiform leaves form a basal rosette around the central stem.

 

 

The following photos were made with a converted Nikon D610 + UV-Nikkor 105/4.5.

 

Visible [f/16 for 1/500" @ISO-400 in Sunlight with Baader UV/IR-Cut Filter]

The tangle of white hairs on the stem and involucre give the plant its common name of Woollywhite.

 

Ultraviolet [f/16 for 1/30" @ISO-800 with SB14 UV-flash (mod) and BaaderU UV-Pass Filter]

The interiorsof the UV-dark disk florets show a bit of false blue. The lines of pollen are bright on the fused stamens.

 

 

Visible [f/11 for 1/500" @ISO-200 with Baader UV/IR-Cut Filter]

 

 

Ultraviolet [f/11 for 1/100" @ISO-800 with SB14 UV-flash (mod) and BaaderU UV-Pass Filter]

 

 

UV+Blue+Green [f/8 for 1/30" @ISO-1600 in Sunlight with Hoya U330 x 2.0mm + S8612 x 2.0mm Filter Stack ]

 

 

Infrared [f/11 for 1/320" @ISO-400 in Sunlight with Schott RG780 x 2.00mm IR-Pass Filter]

[colinbm]

Nice collection of a lovely flower head Andrea