Thalictrum acaule

Thalictrum acaule Jacquem. ex Cambess., Voy. Inde 4: 3 1841. ;
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Afghanistan to W. Himalaya: Afghanistan, West Himalaya as per POWO;
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Thalictrum acaule Jacquem. ex Cambess., considered as a synonym of T. alpinum L., is resurrected as a distinct species by Pusalkar & Singh 2012 (Flora of Gangotri National Park, Western Himalaya, India; page 115-116) and differentiated as:
Flowers 5-6mm across, densely arranged towards the top, leaves yellowish-green, apparently thick, sub-leathery; anthers 2.2-2.5mm long, tepals, anther lobes and filaments of equal length; anthers beaked at apex……… T. acaule
Flowers 2.5-4mm across, distantly and laxly arranged; leaves dark green to greyish green above, pale beneath, apparently thin, papery; anthers 1.5-2mm long; filaments 1-1.5x the length of tepals or anther lobes; anthers mucronate at apex………. T. alpinum
Considering leathery, yellowish-green leaves; flowers densely arranged towards the top of inflorescence; beaked anthers I have placed my species in Thalictrum acaule.
Photographed in Khalya alpine meadow, Munsyari area, Uttarakhand in July 2015.

nice information and pictures

Thanks a lot … for bringing out one more Himalayan beauty from your recent tour..
I can imagine you could have got so much more, if climate had favored you a little..!!

Does Pusalkar mention the distribution of T.alpinum in Uttarakhand and Himachal Pradesh, as we may have to place our posts at T.alpinum (though without complete details) otherwise?

T. alpinum is well known in Uttarakhand. Following species of Thalictrum genus are described in Flora of Uttarakhand volume 1 (Pusalkar & Srivastava, 2018):

  1. Thalictrum acaule
  2. T. alpinum
  3. T. chelidonii
  4. T. cultratum
  5. T. legans
  6. T. foetidum
  7. T. foliolosum
  8. T. javanicum
  9. T. minus
  10. T. pedunculatum
  11. T. platycarpum
  12. T. punduanum
  13. T. reniforme
  14. T. rostellum
  15. T. rutifolium
  16. T. saniculiforme
  17. T. secundum
  18. T. virgatum

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Thalictrum:
Is there any similarity between flowers of
https://sites.google.com/site/efloraofindia/species/m—z/r/ranunculaceae/thalictrum/thalictrum-alpinum
and
https://sites.google.com/site/efloraofindia/species/m—z/r/ranunculaceae/thalictrum/thalictrum-acaule ??

Yes, there appears to a similarity.
But leaves are not visible in many posts.
Based on the keys at Thalictrum acaule, it is difficult to differentiate them.

Need to segregate ??

I think it is difficult with the current set of images.

OK