Bloomeria is a small genus of perennial, bulbous herbs in the family Asparagaceae (subfamily Brodiaeoideae), native to California and Baja California. The genus comprises two to three accepted species, all geophytes growing from fibrous-coated corms.
Plants are scapose — the flowering scape rises slender, cylindrical, and rigid from a basal cluster of one to eight linear-lanceolate, keeled leaves. The inflorescence is an open umbel bearing 10 to 35 flowers on long, erect, ray-like pedicels articulate at both base and apex. Flowers have six persistent tepals that spread widely and are characteristically golden yellow, striped with brownish or greenish lines. The six stamens have filiform upper filaments that broaden at the base, the dilated bases sometimes fusing into a small nectariferous cup that may bear short appendages — a key diagnostic character visible with a hand lens in the field. The ovary is superior and sessile, with three locules, and matures into a small (5–6 mm), three-angled, subglobose capsule that opens by loculicidal dehiscence; seeds are black, angular, and wrinkled.
The base chromosome number is x = 9, except in Bloomeria clevelandii (x = 14). Taxonomically, Bloomeria sits within the broader alliance of western North American geophytes that includes Brodiaea, Triteleia, and Muilla. Hoover (1941, 1955) argued for close affinity with Triteleia based on corm morphology, leaf shape, umbel structure, and seed similarity, but kept the two genera distinct on account of Bloomeria's sessile (vs. stalked) ovary and its more southerly California distribution below the Tehachapi and Santa Lucia Mountains.
Etymology
The genus name Bloomeria honors Hiram Green Bloomer (1819–1874), a pioneer botanist based in San Francisco who was among the earliest collectors of the California flora.
Distribution
Bloomeria is endemic to western North America, with species distributed across California and northern Baja California, Mexico. The genus is notably absent north of the Tehachapi and Santa Lucia mountain ranges of California, a range boundary that separates it from the closely related genus Triteleia.
Taxonomy Notes
Bloomeria's generic boundaries have been debated. Ingram (1953) allied it with Brodiaea, Muilla, and Allium, while Hoover (1941, 1955) placed it closest to Triteleia, citing shared corm morphology, keeled leaves, umbel structure, versatile anthers, three-lobed stigma, filament appendages, similar seeds, and the same base chromosome number (x = 9). The genera are distinguished by Bloomeria's sessile ovary (vs. stipitate in Triteleia) and distinct (vs. connate) tepals, as well as their non-overlapping geographic ranges. The family placement is variously given as Asparagaceae (subfamily Brodiaeoideae) or the segregate family Themidaceae depending on the classification followed.
