SafePlants

Thymeleaf Sandwort (Arenaria serpyllifolia)

Thymeleaf Sandwort, scientifically known as Arenaria serpyllifolia, is a small herb belonging to the Pink Family (Caryophyllaceae). It is also known as Thyme-leaf Sandwort and thyme-leaved sandwort, thyme leaf sandwort, thymeleaved sandwort.

Considerations for Pets

• This plant is described as having stems that are decumbent to ascending or erect.
• It is noted to have fine, dense pubescence (hairs).
• The plant is known to grow in bare ground and arable fields, so there may be exposure during outdoor activities.

Considerations for Children

• This plant is described as having stems that are decumbent to ascending or erect.
• It is noted to have fine, dense pubescence (hairs).
• The plant is known to grow in bare ground and arable fields, so there may be exposure during outdoor activities.

Taxonomy and Nomenclature

• Scientific Name: Arenaria serpyllifolia L.
• Family: Caryophyllaceae (Pink Family)
• Genus: Arenaria
• Species: serpyllifolia
• Synonyms: thyme-leaved sandwort, thyme leaf sandwort, thymeleaved sandwort.
• Subspecies: Arenaria serpyllifolia var. serpyllifolia, formerly Arenaria serpyllifolia ssp. serpyllifolia.
• USDA PLANTS Symbol: ARSE2

Distribution and Habitat

• Thymeleaf Sandwort has been observed on the north-facing slopes of Stacker Butte, Columbia Hills to the north of The Dalles, Oregon.
• It is found in bare ground, arable fields, and walls.

Ecological Role

• Thymeleaf Sandwort (Arenaria serpyllifolia) is sometimes considered a weed.
• The plant is selected for inclusion in the Invasive Species Most Unwanted list.
• It is described as an annual species.

Morphological Characteristics

• Stems: Decumbent to ascending or erect, 1.5 to 16 inches long, puberulent. Ascending or sprawling to upright when flowering, multiple from base and branching infrequently, round, fine dense pubescence.
• Leaves: Opposite, stipules absent, petiole present in lower leaves.
• Flowers: White. Petals are about 2/3 the length of the calyx and are not toothed or lobed. Flower Arrangement: Cyme.
• Habit: Herb. Plant is annual.
• Roots: Taproots filiform.
• Height: Typically grows as an annual herb.

Other Characteristics

• The plant exhibits divaricately branched in upper canopy.
• Life span is perennial.

Habitat Preferences

• Prefers alkaline or neutral soil.

Further Information

• ARKive (now closed) contained photos and facts about Thymeleaf Sandwort.
• Discover Life has a page about the biology, natural history, ecology, identification, and distribution of Arenaria serpyllifolia.
• Dave's Garden offers tips and ideas for gardens, along with seeds and plants.