Jacob's-ladder

Names and Synonyms

Common Names

• Greek valerian
• blue Jacob's-ladder
• Jacob's-Ladder
• Greek-valerian
• charity
• Blue Jacob's Ladder
• Jacob's Ladder

Scientific Names

Accepted name

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant, Polemonium caeruleum, belongs to the kingdom Plantae and the phylum Streptophyta. Within the class Equisetopsida and subclass Magnoliidae, it is categorized under the order Ericales and the family Polemoniaceae. Finally, it is classified under the genus Polemonium.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant, known as Polemonium caeruleum, exhibits a specific distribution throughout the regions of Northern Europe. It can be found growing in the natural landscapes of Denmark and Finland. Its presence is also documented across the islands of Iceland and Great Britain. Furthermore, the species extends its range into the rugged terrain of Norway. Together, these locations define the northern reach of this medicinal plant's habitat.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Polemonium caeruleum is closely tied to moisture-rich environments, as the species thrives primarily in meadows and along the banks of rivers. It is specifically adapted to wet habitats where soil moisture remains consistent, favoring the riparian zones and damp openings of montane and subalpine ecosystems. By occupying these saturated meadowlands and riverine corridors, the plant utilizes the high availability of water to support its growth patterns within these specialized niches.

Habitat :

meadows: wet, rivers

Life history

The life history of Polemonium caeruleum is characterized by its status as a perennial plant, allowing it to persist across multiple growing seasons. As a hemicryptophyte, its perennable buds are located at or just below the soil surface, protected by leaf litter or soil during dormant periods. This species exhibits a deciduous growth habit, shedding its foliage annually to enter a period of rest before regrowing in the spring.

Deciduousness :

deciduous

Life form :

hemicryptophyte

Lifecycle :

perennial

Morphology

The morphology of Polemonium caeruleum is characterized by its growth form as a non-woody herb and specifically a forb. It is a terrestrial plant that functions as a self-supporting organism, meaning it does not exhibit climbing behavior such as a liana or vine. As an independent species, it does not act as a parasite, nor does it function as an epiphyte. The plant reaches a maximum height of 1 meter, with a minimum height of 0.3 meters and a mean height of approximately 0.45 meters.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

forb

Parasite :

independent

Plant height max:

1 m

Plant height mean:

0.45 m

Plant height min:

0.3 m

Woodiness :

non-woody

Physiology

The physiology of Polemonium caeruleum is characterized by a C3 photosynthetic pathway, which is typical for plants inhabiting temperate environments. It is a non-carnivorous species, relying entirely on soil-based nutrient uptake rather than the capture of prey. Morphologically, its leaves exhibit a mean surface area of 18.4 cm² and a mean width of 0.4 cm, with the width remaining consistent at a minimum and maximum of 0.4 cm. The leaf length reaches a maximum of 1.5 cm, contributing to its specific structural profile. Furthermore, the plant maintains a mean Specific Leaf Area (SLA) of 372.67 cm²/g, an indicator of its leaf thickness and resource allocation strategies regarding light interception and metabolic efficiency.

Carnivory :

non-carnivorous

Leaf length max:

1.5 cm

Leaf size mean:

18.4 cm²

Leaf width mean:

0.4 cm

Photosynthetic pathway :

C3

Specific Leaf Area (SLA) mean:

372.67 cm²/g

Reproduction

The reproduction of Polemonium caeruleum is characterized by a sexual reproductive cycle that relies on biotic pollination. The flowering period typically commences in June and extends through August. During this time, the plant utilizes a biotic pollination syndrome, specifically attracting insects such as bees to facilitate the transfer of pollen. While self-fertilization is present within the species, the primary reproductive mechanism involves these insect vectors. Once fertilization is complete, the plant produces fruit in the form of a dehiscence capsule. These capsules eventually open to release seeds that exhibit an anemochorous dispersal syndrome, meaning they are dispersed by the wind. The seeds produced are quite small, with a mean mass of approximately 0.00097575 g, ranging from a minimum of 0.00077 g to a maximum of 0.00122 g. Notably, asexual reproduction is absent in this species, making sexual reproduction through seed production the primary means of propagation.

Dehiscence :

dehiscent

Dispersal syndrome :

anemochorous

Flowering time :

Jun

Flowering time :

Aug

Fruit type :

capsule

Pollination syndrome :

insect

Pollination syndrome :

bee

Pollination syndrome :

biotic

Reproduction asexual :

absent

Seed mass max:

0.00122 g

Seed mass mean:

0.00097575 g

Seed mass min:

0.00077 g

Self fertilization :

present

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Polemonium caeruleum has 2 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include AA, sucrose.

AA

1. Plants (Basel, Switzerland)

sucrose

1. Plants (Basel, Switzerland)