doubtful knight's-spur

Names and Synonyms

Common Names

• doubtful knight's-spur
• rocket larkspur
• Larkspur
• eastern larkspur

Scientific Names

Accepted name

Synonyms

• Ceratostanthus ajacis
• Consolida ajacis
• Consolida ambigua
• Consolida gayana
• Delphinium peregrinum var. ambiguum
• Delphinium candelabrum
• Delphinium ajacis var. minus
• Consolida baluchistanica
• Delphinium ajacis var. hyacinthiflorum
• Delphinium ajacis var. majus
• Delphinium ornatum
• Delphinium gayanum
• Delphinium baluchistanicum
• Delphinium ajacis f. alba
• Delphinium ajacis var. brevipes
• Delphinium ambiguum
• Delphinium addendum

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae within the phylum Streptophyta and the class Equisetopsida. It is further classified under the subclass Magnoliidae and the order Ranunculales, falling into the family Ranunculaceae. Finally, it is categorized under the genus Delphinium.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant, Delphinium ajacis, exhibits a specific distribution pattern across the northern reaches of the European continent. Its presence can be documented throughout various parts of Northern Europe, including the coastal regions of Denmark. It is also found growing within the landscapes of Great Britain and Ireland. Furthermore, the species extends its range into the Scandinavian territories of Norway and Sweden. Consequently, these five regions define the primary geographical footprint of this medicinal species.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Delphinium ajacis is characterized by a broad elevational distribution, spanning from a minimum of 200 m AMSL to a maximum altitude of 5300 m AMSL, with a mean elevational range of approximately 5200 m AMSL. This species exhibits a highly adaptable yet niche-specific habitat preference, often functioning as a rare weed that has been accidentally introduced into truck gardens and cultivated fields. Furthermore, it is frequently found growing in close proximity to human structures and buildings, indicating a capacity to thrive in disturbed anthropocentric environments across diverse altitudinal gradients.

Elevational range max:

5300 m AMSL

Elevational range mean:

5200 m AMSL

Elevational range min:

200 m AMSL

Habitat :

A rare weed accidentally introduced intotruck gardens and cultivated fields and also growing near buildings.

Life history

The life history of Delphinium ajacis is characterized by a lifecycle categorized as an annual, meaning it completes its entire biological cycle from germination to seed production within a single growing season. In terms of its structural growth strategy and life form, the species is classified as a therophyte, a growth habit where the plant survives unfavorable periods through highly resistant seeds rather than persistent vegetative organs. This life form is consistent across its developmental stages, as it functions as a therophyte to navigate its specific environmental requirements and seasonal shifts.

Life form :

therophyte

Lifecycle :

annual

Morphology

The morphology of Delphinium ajacis is characterized by its growth form as a non-woody herb and forb. It is a terrestrial plant that grows independently, lacking any parasitic or epiphytic lifestyle. The plant exhibits an erect shoot orientation and is self-supporting rather than acting as a climber, liana, or vine. In terms of stature, it is a relatively low-growing species with a plant height that ranges from a minimum of 0.3 m to a maximum of 1 m, maintaining a mean height of approximately 0.45 m.

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

Shoot orientation :

erect

Woodiness :

non-woody

Physiology

The physiology of Delphinium ajacis is characterized by a C3 photosynthetic pathway, utilizing the standard Calvin cycle for carbon fixation without the specialized adaptations found in C4 or CAM plants. Its vegetative morphology features linear leaf forms, which influence its surface area for gas exchange and light absorption. Furthermore, the plant is strictly non-carnivorous, relying on soil-based nutrient uptake rather than the capture and digestion of prey to meet its nitrogen and mineral requirements.

Carnivory :

non-carnivorous

Leaf form :

linear

Photosynthetic pathway :

C3

Reproduction

The reproduction of Delphinium ajacis is characterized by a biotic pollination syndrome, specifically relying on insects such as bees to facilitate the transfer of pollen. The flowering process occurs via a raceme inflorescence featuring blue flowers, with the blooming period typically beginning in June and concluding in August. This species does not exhibit self-fertilization, nor does it utilize asexual reproduction, meaning it relies on sexual processes for propagation. Once fertilization is successful, the plant produces a capsule-type fruit that is dehiscent in nature. The fruits maintain a consistent length of approximately 1.8 cm. Within these capsules, the seeds vary in mass, ranging from a minimum of 0.00086 g to a maximum of 0.00355 g, with a mean seed mass of 0.00218233333333333 g. Following maturation, the plant employs an autochorous dispersal syndrome, where the seeds are dispersed through autochory.

Dehiscence :

dehiscent

Dispersal syndrome :

autochorous

Flower colour :

blue

Flowering time :

Jun

Flowering time :

Aug

Fruit length max:

1.8 cm

Fruit type :

capsule

Inflorescence :

raceme

Pollination syndrome :

insect

Pollination syndrome :

bee

Pollination syndrome :

biotic

Reproduction asexual :

absent

Seed mass max:

0.00355 g

Seed mass mean:

0.00218233333333333 g

Seed mass min:

0.00086 g

Self fertilization :

absent

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Delphinium ajacis has 20 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Delcosine, Delsoline, 18-Demethylpubescenine, AJACONINE, Acetyldelcosine.

Delcosine

1. Dr. Duke
2. Journal of natural products

Delsoline

1. Dr. Duke
2. Journal of natural products

18-Demethylpubescenine

1. Journal of natural products

AJACONINE

1. Dr. Duke

Acetyldelcosine

1. Dr. Duke

Ajacine

1. Dr. Duke

Ajacusine

1. Dr. Duke

Ajadine

1. Dr. Duke

Anthranoyllycoctonine

1. Dr. Duke

Consolidine

1. Dr. Duke

Activities

Delphinium ajacis has 197 reported activities identified across 0 scientific publications and several other databases. The most consistently reported activities include 11B-HSD-Inhibitor, 5-Lipoxygenase-Inhibitor, ATPase-Inhibitor, Aldehyde-Oxidase-Inhibitor, Aldose-Reductase-Inhibitor.

11B-HSD-Inhibitor

1. Dr. Duke

5-Lipoxygenase-Inhibitor

1. Dr. Duke

ATPase-Inhibitor

1. Dr. Duke

Aldehyde-Oxidase-Inhibitor

1. Dr. Duke

Aldose-Reductase-Inhibitor

1. Dr. Duke

Allelochemic

1. Dr. Duke

Allergenic

1. Dr. Duke

Analgesic

1. Dr. Duke

Anthelmintic

1. Dr. Duke

AntiCrohn's

1. Dr. Duke