Siler's penstemon

Names and Synonyms

Common Names

• Siler's penstemon
• Toadflax Beardtongue
• Toadflax Penstemon

Scientific Names

Accepted name

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae within the phylum Streptophyta and the class Equisetopsida. Under the subclass Magnoliidae, it is classified in the order Lamiales and the family Plantaginaceae. Finally, it is identified by the genus Penstemon.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a specific range across several regions of the western United States. In the Northwestern U.S.A., its presence can be documented within the state of Colorado. Moving into the Southwestern U.S.A., it is widely distributed across Arizona, Nevada, and Utah. Additionally, the species extends into the South-Central U.S.A., specifically found in New Mexico. This pattern demonstrates a concentrated distribution throughout the arid landscapes of the Southwest.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Life history

The life history of Penstemon linarioides is characterized by its status as a perennial plant, meaning it lives for multiple years and undergoes repeated seasonal cycles of growth and dormancy. Unlike annuals that complete their life cycle in a single season or biennials that require two years, this species establishes a persistent root system that allows it to survive through various environmental conditions and regrow annually. Its developmental pattern involves a period of vegetative growth, often following seasonal moisture availability, followed by a reproductive phase where it produces flowering stalks. As a perennial, it invests energy into long-term survival, allowing it to maintain a presence in its habitat over extended periods and contribute to the population through successive flowering events.

Lifecycle :

perennial

Morphology

The morphology of Penstemon linarioides is characterized by its growth form as a forb, displaying a structural habit that can be classified as variable in terms of woodiness. While primarily herbaceous, its stems may exhibit varying degrees of woodiness depending on environmental conditions and age. Regarding its climbing habit, the plant is categorized as self-supporting, meaning it does not rely on external structures through obligate or facultative climbing mechanisms but instead maintains its own upright or spreading stature.

Climber :

self-supporting

Growth form :

forb

Woodiness :

variable

Physiology

The physiology of Penstemon linarioides is characterized by its reliance on the C3 photosynthetic pathway, a metabolic process where carbon dioxide is fixed directly into a three-carbon compound during the Calvin cycle. As a C3 plant, its physiological efficiency is highly dependent on environmental conditions such as light intensity, temperature, and water availability, as it lacks the specialized carbon-concentrating mechanisms found in C4 or CAM species. Under typical moisture-rich conditions, the plant optimizes gas exchange through its stomata to facilitate carbon assimilation; however, during periods of water stress, it may undergo stomatal closure to mitigate transpiration, which subsequently limits CO2 uptake and can increase photorespiration. This metabolic framework dictates its growth patterns and resource allocation, ensuring that its energetic requirements are met through the direct fixation of atmospheric carbon dioxide within the mesophyll cells.

Photosynthetic pathway :

C3

Reproduction

The reproduction of Penstemon linarioides is characterized by the production of specialized seeds that exhibit a highly consistent morphology and weight. The reproductive output of this species yields seeds with a uniform mass across all recorded samples, showing no variation between the minimum and maximum values. Specifically, the seed mass is measured at a constant value of 0.0012 g, which serves as both the mean, the maximum, and the minimum seed mass for the plant. This precise measurement indicates a highly standardized seed production process, ensuring that each individual propagule carries a specific and reliable amount of energy reserves for germination.

Seed mass mean:

0.0012 g

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Penstemon linarioides has 4 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Acteoside, Leucosceptoside A, POLIUMOSIDE, Plantarenaloside.

Acteoside

1. Journal of natural products

Leucosceptoside A

1. Journal of natural products

POLIUMOSIDE

1. Journal of natural products

Plantarenaloside

1. Journal of natural products

Conditions

Penstemon linarioides has 1 reported investigations on conditions identified across 0 scientific publications and several other databases. The most consistently reported conditions include tumor.

Tumor

1. Journal of natural products

Preparations

Penstemon linarioides has 1 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include CH2Cl2-MeOH (1:1) extracts.

Ch2cl2-meoh (1:1) extracts

1. Journal of natural products