Sonoran plants

Hi all,

Recently I hiked Aravipa Canyon, north-east of Tucson, AZ. Found some plants I didn't know:

Pictures 1 & 2 are of the same plant. It was about 4-5 feet high, found near water.

3rd picture is some kind of Euphorbiaceae.

4th picture some kind of Asteraceae, low-growing, sprawling plant.

Last set of pictures are of a plant found near water. It looked like an annual, and was resinous-sticky. Maybe a Scrophulariaceae?

Thanks!

 

#4 looks like Heterotheca villosa or Heterotheca zionensis. For me, they look the same.

 

1. Desert Cotton (Gossypium thurberi)?
http://fireflyforest.net/firefly/2005/12/18/thurbers-cotton/

 

#5/6 could be some penstemon. For some species they indicate leaves in whorls of three.

 

Good call on desert cotton.

The plant in the 3rd picture is a Stillingia species.

I believe the last plant is Stemodia durantifolia.

 

Great! And it also has triple whorls:

http://www.fireflyforest.com/flowers/violets/violet43.html

At least I was inside the same family: Scrophulariaceae or Plantaginaceae, depending on whom you ask.