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	Polemonium caeruleum  L.

Fam.: Polemoniaceae / Jacob's-Ladder Fam.

Genus:  Polemonium  L.

Authors:
	L.:		Carl von Linné (Linnaeus, 1707 - 1777), Swedish naturalist who introduced the binary naming system for plants and animals

Etymology:
	Polemonium:		Polemon (65-7 BC), king of Pontos
	caeruleum:		sky blue

Fig. 1:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian CH Albula-Pass 11.7.2013 (Photo: Ursula Schiebold)

Fig. 2:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian CH Albula-Pass 11.7.2013 (Photo: Ursula Schiebold)

Fig. 3:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian CH Albula-Pass 11.7.2013 (Photo: Ursula Schiebold)

Fig. 4:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian CH Albula-Pass 11.7.2013 (Photo: Ursula Schiebold)

Fig. 5:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Sundern 14.6.2019

Fig. 6:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Sundern 14.6.2019

Fig. 7:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Sundern 14.6.2019

Fig. 8:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Sundern 14.6.2019

Fig. 9:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Sundern 14.6.2019

Fig. 10:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Sundern 14.6.2019

Fig. 11:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (color variant) D Sundern 14.6.2019

Fig. 12:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (color variant) D Sundern 14.6.2019

Fig. 13:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Sundern 14.6.2019

Fig. 14:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Beuron 26.7.2015

Fig. 15:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian D Beuron 26.7.2015

Fig. 16:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) D Pappenheim 19.6.2014

Fig. 17:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) D Pappenheim 19.6.2014

Fig. 18:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) F Col de Lautaret Botan. Gar. 28.6.2008

Fig. 19:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) F Col de Lautaret Botan. Gar. 28.6.2008

Fig. 20:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) F Col de Lautaret Botan. Gar. 28.6.2008

Fig. 21:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) F Col de Lautaret Botan. Gar. 28.6.2008

Fig. 22:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) F Col de Lautaret Botan. Gar. 28.6.2008

Fig. 23:  Polemonium caeruleum / Jacob's Ladder, Greek Valerian (cultiv.) D Botan. Gar. Krefeld 13.6.2019

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