Characterized by its resilient, mat-forming growth habit, Calyptridium umbellatum var. caudiciferum inhabits rugged alpine zones. It is commonly found on exposed ridges and gravelly slopes where few other vascular plants can survive.
This variety represents the modern accepted combination for the taxon historically described under the genus Spraguea. Its low profile helps it endure high winds, freezing temperatures, and intense solar radiation.
This plant develops a complex, branching caudex arising from a deep taproot, which anchors it securely in loose scree. The basal rosettes are highly congested, featuring spoon-shaped, fleshy leaves that measure between 1 and 2.5 centimeters in length.
The inflorescence consists of a tight, dome-shaped cluster of small flowers borne on very short, prostrate to ascending stems. The petals, ranging from white to deep pink, are flanked by broad, translucent sepals that remain on the plant even after the seeds mature.
July to September
The species name umbellatum refers to the umbrella-like shape of its clustered flower heads. In alpine environments, the membranous sepals of this plant act like miniature greenhouses, traps of heat that accelerate seed development during the brief mountain summer.
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