Echinocactus grusonii [Golden Barrel Cactus]: with Spider Web

[Andrea B.]

Blum, A.G. (2014) Echinocactus grusonii Hildman with Spider Web (Cactaceae) Golden Barrel Cactus. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...ith-spider-web/

 

Desert Botanical Garden, Phoenix, Arizona, USA

23 April 2013

Wild cactus as botanical garden specimen

 

Synonyms:

• Mother-in-Law's Cushion
  

Comment:

From the Wikipedia entry⁽¹⁾ we have that the wild population of the Mexican cactus E. grusonii is endangered. However, wide cultivation of the species has preserved it as a popular ornamental in US Southwestern gardens and botanical parks.

Look how much more obvious the extensive spider web is in the UV photograph.

 

Reference:

1. Echinocactus grusonii (2014 Wikipedia: http://en.wikipedia....cactus_grusonii

I'm not yet really comfortable referencing Wikipedia, but it's all I currently have for this Echinocactus.

2. Desert Botanical Garden (2014) Phoenix, Arizona, USA

This marker is near a smaller group of E. grusonii not seen in the photos below.

 

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

 

Visible Light [f/11 for 1/400" @ ISO 200 in Sunlight with Baader UVIR-Block Filter]

 

Ultraviolet Light [f/11 for 1/2" @ ISO 400 in Sunlight with Baader UV-Pass Filter]