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Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Tue May 24, 2022 5:08 pm
by jerrytheplater
I have two cacti that have a label saying Pediocactus simpsonii. I know the handwriting on the label is John Spain's from CT. I purchased them at a CCSS show in the spring prior to 2017. Someone suggested they were not P. simpsonii but rather Escobaria sneedii v. leei. I'd like your opinion please.
This photo was taken June 11, 2017. Now I can say that these plants were still shrivelled and not fully expanded from the winter rest. I must not have watered them enough.
- rsz_2017-6-11 Pediocactus simpsonii or Esco. sneedii v leei 2.jpg (155.17 KiB) Viewed 1476 times
I repotted my two plants on March 23, 2021 before they started growing for the season. Here they are bare root.
- rsz_2021-3-23 Pediocactus simpsonii repotting.jpg (146.98 KiB) Viewed 1476 times
Here are the two plants taken Sept 23, 2021 as they were starting to shrivel for the winter.
- rsz_2021-9-23 Esco. sneedii v leei or Pedio. simpsonii 1 jpg.jpg (145.9 KiB) Viewed 1476 times
- rsz_2021-9-23 Esco. sneedii v leei or Pedio. simpsonii 4 jpg.jpg (145.09 KiB) Viewed 1476 times
Now here is one taken on May 14, 2022 after I was more conscious of watering them in the Spring. They have flower buds just starting to show now, but maybe not in this photo.
- rsz_2022-5-14 Esco. sneedii v leei or Pedio. simpsonii 1 jpg.jpg (148.14 KiB) Viewed 1476 times
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Wed May 25, 2022 1:33 am
by MrXeric
Certainly looks more like a form or variety of Escobaria sneedii (or Pelecyphora sneedii if you prefer). I believe the form/variety 'leei' has more radial spines and less central spines? Smaller too.
Easiest way to differentiate a flowering size Escobaria/Pelecyphora from other genera is to look for grooves on the tubercles. Grooves on tubercles are a defining characteristic of Pelecyphora and these grooves are not present on Pediocactus.
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Wed May 25, 2022 1:52 am
by keith
Escobaria sneedii maybe v. leei not pediocactus simpsonii I have a few more seeds of pediocactus simpsonii try with thicker cardboard or padded envelope you go first
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Wed May 25, 2022 2:16 am
by jerrytheplater
Eric, where would these grooves be if they are there? Top?, Bottom?, Sides? Do they run around the diameter or lengthwise down it? (I just read on Llifle for E. sneedii ssp. leei that the upper surface of the tubercle is grooved on mature stems)
I'll have to get out my magnifying glass. Its going to be tough. The spines are very dense.
Llife says there is a clumping form of Pediocactus simpsonii:
http://www.llifle.com/Encyclopedia/CACT ... mping_Form
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Wed May 25, 2022 3:08 am
by MrXeric
The groove should be on the upper surface of each tubercle, extending lengthwise from where the spines are. I could not find a good picture of sneedii tubercles, but check out the images here of P. vivipara:
https://www.swcoloradowildflowers.com/P ... vipara.htm
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Wed May 25, 2022 5:34 pm
by jerrytheplater
Thanks Eric. The groove is very plain in that link. Now to look at mine. I'll let you all know what I find.
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Wed May 25, 2022 6:02 pm
by jerrytheplater
I went to my copy of Britton and Rose Cactaceae to look at the entry for Pediocactus and Escobaria. Here are the descriptions published back then around 1913 or so.
- B&R Cactaceae Pedio-Escobaria.jpg (142.97 KiB) Viewed 1410 times
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Thu May 26, 2022 2:15 am
by jerrytheplater
It looks like Keith is correct. I have an Escobaria and I must have miss positioned the label. At one point these plants were growing outside in a Trough garden. The ID tag could have gotten moved by a small visitor. I could see a wooly tuft going down the upper surface of most of the tubercles. The wool was growing out of a depression on the upper surface of a Tubercle. I'll see if I can take a photo, but maybe not till next week.
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Thu May 26, 2022 7:48 pm
by jerrytheplater
I was able to get a shot of a groove on one of the tubercles.
I first washed off the cactus with a strong spray of DI water. (It needed to be watered anyway.) I blew it off with a fine jet of compressed air to dry. Then I tried to figure out how to take the shot with the microscope at work. It took about 2 hours to prepare the cactus and position it to get the shot.
- 2022-5-26 E. sneedii setup.JPG (120.62 KiB) Viewed 1363 times
This is an older tubercle as it has lost a lot of spines already, but that made it easier to see the groove.
- 2022-5-26 Escobaria sneedii grooved tubercle.jpg (115.16 KiB) Viewed 1363 times
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Sat May 28, 2022 12:37 am
by MrXeric
Nice picture.
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Sat May 28, 2022 4:21 am
by Hanazono
I have Pediocactus simpsonii v minor. My friend gave me two cacti some years ago.
They have survived but their growing speed is very slow. I have not seen their flowers yet.
The photo is one of them, just 35 mm in diameter.
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Sat May 28, 2022 3:13 pm
by keith
Pediocactus simpsonii all mine have started to clump which is not typical in Habitat . This is a old picture.
Re: Pediocactus simpsonii or Escobaria sneedii v. leei?
Posted: Thu Jun 02, 2022 7:06 pm
by jerrytheplater
So this plant bloomed on 5/31. Took a photo with my new camera and a macro lens, hand held. Still learning this camera. A tripod would have helped a bit more.
- 2022-5-31 Escobaria sneedii.JPG (103.33 KiB) Viewed 1235 times