Definition
Caulanthus glaucus is a species of flowering plant in the family Brassicaceae, commonly known as glaucous wildcabbage.
Overview
Caulanthus glaucus is an annual herb native to the western United States, primarily occurring in California, Nevada, and Arizona. It inhabits arid and semi‑arid environments such as desert scrub, open slopes, and chaparral, typically at elevations ranging from 300 to 1,800 m. The species blooms in the spring months, producing clusters of small, white to pale lavender flowers.
Etymology / Origin
The generic name Caulanthus derives from the Greek words kaûlon (“stem”) and ánthos (“flower”), referring to the stem‑borne inflorescences characteristic of the genus. The specific epithet glaucus comes from the Latinized Greek glaukós, meaning “bluish‑gray” or “glaucous,” a reference to the gray‑green, waxy coating on the plant’s leaves and stems.
Characteristics
- Growth form: Erect annual herb, typically 30–60 cm tall.
- Leaves: Basal rosette of fleshy, oblanceolate leaves with a glaucous (bluish‑gray) surface; cauline leaves are reduced and clasp the stem.
- Inflorescence: Raceme arising from the upper stem; each flower is borne on a short pedicel.
- Flowers: Four‑petaled, actinomorphic, usually white to pale lavender; petals are about 5–8 mm long.
- Fruit: Linear silique, 3–6 cm long, containing numerous small seeds.
- Phenology: Flowering occurs from March to June, depending on local climate conditions.
- Ecology: Adapted to dry, well‑drained soils; the glaucous leaf coating reduces water loss. Pollination is primarily by generalist insects.
Related Topics
- Brassicaceae: The mustard family, encompassing economically important crops and numerous wild species.
- Caulanthus: The genus, which includes other species such as C. pilosus (hairy wildcabbage) and C. citrinus (yellow mustard).
- Desert flora of the Southwestern United States: Community of plants adapted to arid conditions, often sharing traits such as reduced leaf area and waxy coatings.
- Silique: A type of dry fruit characteristic of the Brassicaceae, splitting open along two seams to release seeds.
Note: The information presented reflects data available from botanical references and herbarium records up to 2024. Any recent taxonomic revisions or distribution updates may not be included.