Scottish Rock Garden Club Forum
Bulbs => Bulbs General => Topic started by: Herman Mylemans on April 06, 2025, 05:13:52 PM
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Trillium nivale
Trillium ovatum
Trillium albidum
Trillium kurabayashii
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Trillium cuneatum
Trillium sessile (true)
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It is nice to see how Trillium season is on over there. Here only T.nivale is flowering.
I think I have lost my T.albidum seedlings, there is no sign of them yet, and right close to them T.chloropetalum is already in bud.
It is too early, I worry about how they stand the freezing nights.
T.nivale can cope with cold. :)
[attachimg=1]
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Trillium kurabayashii from seeds collected in the wild in Northern California
[attach=1]
Trillium pusillum, which gently seeds around
[attach=2]
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Pseudotrillium rivale, in three forms
[attachimg=1] [attachimg=2] [attachimg=3]
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Pseudotrillium rivale in the garden. It seeds around the whole garden.
[attachimg=1] [attachimg=2]
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Trillium kurabayashii from seeds collected in the wild in Northern California
It resembles my Trillium angustipetalum - do You know how to tell them apart?
(https://up.picr.de/49456432or.jpg)
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Unfortunately, I can't help you differentiate trilliums. I find the descriptions and pictures confusing. The wild-collected T. kurabayashii resembles the ones I've been growing for years, but since I'm not a botanist, I couldn't say if they're identical or not!
...Claire
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Thank You, Clare - I share Your problems. I try to use the key given by Case & Case, but as the measures are often overlapping, it is difficult to decide if it´s one species or the other for someone like me. Anyway, I came to select my seedlings for beauty and floriferousness, as my garden isn´t large enough for a botanical collection. :)
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If my Trillium kurabayashii hasn't reappeared this year, does that mean it's dead? It had 2 stems last year and seemed to have recovered well.
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Trillium parviflorum
According to my nose, parvi-scented too 😉
[attachimg=1]
[attachimg=2]
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It resembles my Trillium angustipetalum - do You know how to tell them apart?
(https://up.picr.de/49456432or.jpg)
Mariette,
T. angustipetalum: petals are very narrow, flower is cylindrical
T. kurabayashii: petals are inverted lanceolate, flower is inverted pyramid
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Trillium decumbens
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Mariette,
T. angustipetalum: petals are very narrow, flower is cylindrical
T. kurabayashii: petals are inverted lanceolate, flower is inverted pyramid
Thank You, Herman! Would You call the trillium pictured a Trillium angustipetalum?
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This is how eflora differentiates T. angustipetalum and T. kurabyashii - by the anther connective.
The anther connective is the part that connects the left and right parts of the anther.
Here on T. nivale, the anther connective is green, the anther is yellow. The (anther) sac extends beyond the anther connective.
[attach=4]
Here on T. cuneatum and T. sessile , the anther connective extends beyond the (anther) sac.
[attach=1] [attach=2]
http://efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101984
[attachimg=3]
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Thank You, Herman! Would You call the trillium pictured a Trillium angustipetalum?
I think so, it is definitely not kurabyashii.
One problem is that if it comes from garden seed, crossbreeding is possible.
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(Attachment Link) This is how eflora differentiates T. angustipetalum and T. kurabyashii - by the anther connective.
The anther connective is the part that connects the left and right parts of the anther.
Here on T. nivale, the anther connective is green, the anther is yellow. The (anther) sac extends beyond the anther connective.
(Attachment Link)
Here on T. cuneatum and T. sessile , the anther connective extends beyond the (anther) sac.
(Attachment Link) (Attachment Link)
http://efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101984
(Attachment Link)
Thank You very much, Rick! The next days I´ll check if I can sort them out! In Europe, Trillium chloropetalum is usually sold as the rarer and more expensive Trillium kurabayashii. Having grown some plants from US seed, I´m in the lucky position to have some true Trillium kurabayashii in my garden, as the connectives clearly show. Yet often features are puzzling - for instance, the petals of my putative Trillium angustipetalum are somewhat wider than they ought to be, according to Case & Case, they measure 2.3 mm. As the measures given for the different species are often overlapping, it possibly takes more experience to discern these species for sure.
This is one of the Trillium kurabayashii I grew.
(https://up.picr.de/49470573fn.jpg)
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I think so, it is definitely not kurabyashii.
One problem is that if it comes from garden seed, crossbreeding is possible.
Thank You, Herman, You´re probably perfectly right: the hybrids are a problem in our gardens.
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Sometimes it's incredibly difficult to distinguish species in any genera! Somehow, you have to know what matters..... and what doesn't. Color variation in petals is usually a poor characteristic to go by in most every genus. You never see the greener forms of T. cuneatum in cultivation, for instance, but I have them from a friend who owns a woods that is covered with them:
[attachimg=1]
[attachimg=2]
[attachimg=3]
[attachimg=4]
And my favorite cuneatum pic:
[attachimg=5]
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Rick, it´s great to get information from someone in whose country these plants actually grow! Two days ago, I visited a gardener who grows a very beautiful trillium he bought as Trillium kurabayashii: large flowers of a brilliant dark red. Really a very desirable plant, yet not kurabayashii, but chloropetalum.
Thanks for showing these interesting variations!
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Trillium chloropetalum var. giganteum
Trillium erectum
Trillium flexipes
Trillium grandiflorum f. roseum
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Trillium maculatum
Trillium pusillum var. pusillum
Trillium ludovicianum