Dodecatheon pulchellum

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cohan
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Joined: 2011-02-03

Interesting, Gene- I can't say I was looking for differences, but when I was collecting wild seed at quite a few sites within several to maybe 10 miles from here, I remember the seed capsules all looking about the same, but again, I was not looking for differences.. all about the same reddish/tan colour... certainly the plants around here have a lot of variation in leaves...

I might have this wrong, but I think Kristl mentioned there also being a difference in the germination pattern of a couple of the species, and i think the seeds I sent here germinated at warm, which is characteristic of D pulchellum (I'd have to ask her whether I'm remembering that correctl)

west central alberta, canada; just under 1000m; record temps:min -45C/-49F;max 34C/93F; http://picasaweb.google.ca/cactuscactus  http://urbanehillbillycanada.blogspot.com/

RickR
Title: Moderator
Joined: 2009-09-21

This is what Dr. Deno found with the Dodecatheon seed he trialed:

Dodecatheon alpinum ------- 70L
Dodecatheon amethystinum - 70D GA-3 40-70
Dodecatheon jeffreyi ------- 40-70
Dodecatheon media -------- 40
Dodecatheon pulchellum ---- 70
Dodecatheon pulchellum  --- 70D

Rick Rodich    zone 4a.    Annual precipitation ~24 inches
near Minneapolis, Minnesota, USA

cohan
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I haven't used Dr Deno's work enough yet to be familiar with the codes.... I think the relevant comparison in Alberta would be pulchellum vs conjugens.. I'll ask Kristl what she thinks about it...

west central alberta, canada; just under 1000m; record temps:min -45C/-49F;max 34C/93F; http://picasaweb.google.ca/cactuscactus  http://urbanehillbillycanada.blogspot.com/

cohan
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Kristl confirmed that pulchellum is an easy warm germinator, and conjugens requires cold! Interesting diagnostic tool :)

west central alberta, canada; just under 1000m; record temps:min -45C/-49F;max 34C/93F; http://picasaweb.google.ca/cactuscactus  http://urbanehillbillycanada.blogspot.com/

Gene Mirro
Title: Member
Joined: 2010-02-25

My pulchellum seeds, which were collected in western Oregon, didn't germinate until Spring. 

Take a look at this distribution map:  http://plants.usda.gov/java/profile?symbol=dopu

I don't think we should expect seeds collected in southern California to behave the same as those collected in Alaska.  Dodecatheon clevelandii, which is native only in California, is an immediate germinator at around 60F.  That's good, because some of them grow in areas where there is no winter cold.

SW Washington state, 600 ft. altitude

cohan
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Joined: 2011-02-03

No doubt, Gene, and likely some of the widespread species include a number of significantly different variants over long distances;
One interesting thing is that pulchellum (the presumed pulchellum I sent to Kristl were warm germinators) and conjugens have overlapping ranges in Alberta, and still presumably the different germination strategies... It would be very interesting to know what any hybrids the two make would have as germination strategies..

west central alberta, canada; just under 1000m; record temps:min -45C/-49F;max 34C/93F; http://picasaweb.google.ca/cactuscactus  http://urbanehillbillycanada.blogspot.com/

Lori S.
Title: Moderator
Joined: 2009-10-27

Lori wrote:

I was told by a botanist acquaintance that the most definitive way to separate them is to look at the seed capsules... not something I've yet done.

From Flora of Alberta, Dodecatheon conjugens is supposed to have seed capsules that are cylindric and *operculate (with truncate [squared-off] capsule teeth), while S. pulchellum is supposed to have capsules that are cylindric to ovoid and **valvate (with acute [pointed] capsule teeth).  It would be nice to be able to compare these side-by-side to understand the differences... assuming one wasn't looking at a hybrid swarm.

* Like the seed capsule of Jeffersonia dubia.
**Like an aquilegia seed capsule.

Lori
Calgary, Alberta, Canada - Zone 3
-30 C to +30 C (rarely!); elevation ~1130m; annual precipitation ~40 cm

cohan
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Joined: 2011-02-03

It would be good to rent a botanist for some outings  ;D

west central alberta, canada; just under 1000m; record temps:min -45C/-49F;max 34C/93F; http://picasaweb.google.ca/cactuscactus  http://urbanehillbillycanada.blogspot.com/

Gene Mirro
Title: Member
Joined: 2010-02-25

I've sown two lots of D. pulchellum seeds, one from plants native to the Willamette Valley, Oregon, and one from the NARGS seed exchange.  I'm going to give them every opportunity to germinate at warm temps.  I'll let you know what happens right around the end of February.

SW Washington state, 600 ft. altitude

Gene Mirro
Title: Member
Joined: 2010-02-25

No germination in warmth.  Both lots are germinating now, after 4 months of cold, followed by 60F under lights.  The plot thickens.

SW Washington state, 600 ft. altitude

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