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Blackstonia grandiflora (often classified as Blackstonia perfoliata subsp. grandiflora) is an eye-catching, Mediterranean annual herb in the gentian family (Gentianaceae). Known for its vibrant yellow blossoms and fused, perfoliate leaves, it primarily thrives in damp, calcium-rich soils across Western and Central Mediterranean regions.
Plant Profile & Characteristics
Appearance: Features an erect, hairless stem that can grow up to 60 cm tall.
Leaves: Distinctive, bluish-green (glaucous) leaves that clasp and fuse completely around the stem (connate/perfoliate).
Flowers: Its bright yellow blossoms are larger than typical yellow-worts, measuring up to 20-30 mm in diameter, and have a higher number of petals and floral segments (often up to 12).
Bloom Time: Flowers from late spring through mid-summer (May to August).
Habitat & DistributionRange: Native to the Mediterranean basin, found abundantly in Spain, the Balearic Islands, Italy, Algeria, and Morocco.
Environment: Thrives in subtropical biomes, specifically in calcareous, damp grasslands and temporary wet meadows.
