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[[File:Jacob's Ladder or Greek valerian (Polemonium caeruleum).jpg|thumb|right|''Polemonium caeruleum'']]
'''Polemonium caeruleum, known as Jacob's-ladder or Greek valerian, '' is a hardy perennial flowering plant. The plant produces cup-shaped, lavender-coloured or white flowers. It is native to temperate regions of Europe.
==Uses==
==Identification==
===Leaf===
{{Leaf|Simple|alternate|The leaves are divided into 3-6 toothed compound i.e made up of two or more discrete leaflets, with smaller leaflets in between}}<ref name="Leaf"/>
===Flower===
{{Flower|Unisexual|2-4cm long|Yellowblue to purple|5-20|Flowers Season The flower is June - Augustradially symmetrical}}
===Fruit===
{{Fruit|General|7–10 mm (0.28–0.4 in.) long pome|clearly grooved lengthwise, Lowest hooked hairs aligned towards crownThe fruit is dry and splits open when ripe|With hooked hairs|many}}
===Other features===
<ref name="chemical composition">[https://www.sciencedirect.com/science/article/pii/S0378874112006393?via%3Dihub "sciencedirect"]</ref>
<ref name="Leaf">[https://webgobotany.archivenewenglandwild.org/webspecies/20131226161459polemonium/http:caeruleum//www.wildflowers-guide.com/39-agrimony.html "wayback machineplant charecteristics"]</ref>
<ref name="How to plant/cultivate">[https://www.pfaf.org/USER/Plant.aspx?LatinName=Polemonium+caeruleum "cultivation details"]</ref>
==External Links==
* [httphttps://www.indianmirrorhenriettes-herb.com/ayurvedaeclectic/agrimonykings/polemonium.htmlPolemonium caeruleum on henrittes herb.com]* [httpshttp://wwwciteseerx.ist.pfafpsu.orgedu/userviewdoc/Plant.aspxdownload?LatinNamedoi=Agrimonia+eupatoria]* [https://www10.1.herbal-supplement-resource1.com/agrimony-herb845.html2944&rep=rep1&type=pdf NECTARY STRUCTURE IN DICHOGAMOUS FLOWERS OF POLEMONIUM]* [https://www.globalherbalsuppliessciencedirect.com/herb_informationscience/article/agrimony.htmpii/S0378874114002827 Polemonium caeruleum on science direct]* [httpshttp://botanicalwww.missouribotanicalgarden.com/botanicalorg/mgmhPlantFinder/a/agrim015PlantFinderDetails.htmlaspx?kempercode=u490 Polemonium caeruleum on missouri botonical garden]
[[Category:Herbs]]
