Polemonium

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Polemonium

Polemonium, commonly called Jacob's ladder, is a genus of about 25 species of flowering plant

Flowering plant

The flowering plants or angiosperms are the most widespread group of Embryophytes. The flowering plants and the gymnosperms are the only extant groups of Spermatophyte....
s in the family Polemoniaceae

Polemoniaceae

The Polemoniaceae comprises 18-25 genera with between 270-400 species of mostly annual plants, native to the Northern Hemisphere and also South America, with the center of diversity in western North America, especially in California....
, native to cool temperate to arctic regions of the Northern Hemisphere

Northern Hemisphere

The Northern Hemisphere is the half of a planet that is north of the equator?the word sphere literally means 'half sphere'. It is also that half of the celestial sphere north of the celestial equator....
and also in the southern Andes

Andes

The Andes form the world's longest exposed mountain range. They lie as a continuous chain of highland along the western coast of South America. The range is over 7,000 km long, 200-700 km wide , and of an average height of about 4,000 m ....
in South America

South America

South America is the southern continent of the Americas, situated entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere....
. Many of the species grow at high altitudes in mountains.

They are perennial plant

Perennial plant

A perennial plant or perennial is a plant that lives for more than two years. When used by gardeners or horticulturalists, this term applies specifically to perennial herbaceous plants....
s (rarely annual plant

Annual plant

An annual plant is a plant that usually germinates flowers and dies in one year. True annuals will only live longer than a year if they are prevented from setting seed....
s) growing 10–120 cm tall with bright green leaves

Leaf

In botany, a leaf is an above-ground plant Organ specialized for photosynthesis. For this purpose, a leaf is typically flat and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues....
divided into lance-shaped leaflet

Leaflet

A leaflet in botany is a part of a compound leaf. A leaflet may resemble an entire leaf leaf, but it is not borne on a Plant stem as a leaf is, but rather on a vein of the whole leaf ....
s, and produce blue (rarely white or pink) flower

Flower

A flower, sometimes known as a bloom or blossom, is the reproduction structure found in flowering plants . The biological function of a flower is to mediate the union of male sperm with female ovum in order to produce seeds....
s in the spring and summer.

Polemonium species are used as food plants by the larva

Larva

A larva is a young form of animal with indirect developmental biology, going through or undergoing metamorphosis .The larva can look completely different from the adult form, for example, a caterpillar differs from a butterfly....
e of some Lepidoptera

Lepidoptera

Lepidoptera is an order of insect that includes moths and butterfly. It is one of the most speciose orders in the class Insecta, encompassing moths and the three superfamilies of butterfly, skipper , and Hedylidae....
species including Coleophora polemoniella
Coleophora

Coleophora is a very large genus of moths of the family Coleophoridae with around 1000 described species. The genus is represented on all continents but the majority are found in the Nearctic and Palaearctic regions....
.

Selected species

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