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Sonoran Desert Loasa

Mostly perennial herbs in the Sonoran Desert. Flowers with numerous stamens and with the ovary inferior, i.e. positioned below the flower petals/sepals. Leaves with stiff, often hooked or stinging hairs. Several species shown.

Yellow Comet
Blazing Star

Mentzelia affinis

Jones' Blazing Star

Mentzelia jonesii

Photo © Mike Plagens

Pale yellow flowers about size of American dime with many stamens. Leaves dark green and with rounded lobes. Low growing spring annual on lower desert habitats absent in dry years. Detailed Description

Photo © Mike Plagens

Bright yellow flowers about 25 mm in diameter. Seed pods club-shaped and often curved or 'S'-shaped. Upper elevations of the Sonoran Desert. Detailed Description

Adonia Blazing Star

Mentzelia multiflora

White-bract Blazing Star

Mentzelia involucrata

Stick-Leaf or Blazing Star, Pen & Ink illustration © Mike Plagens

Elongate, wavy toothed leaves are stiff and act like Velcro® - they will adhere to clothing or fur. Plants also called "Stickleaf". Bright yellow flowers with many petals. Found along sandy washes in the Sonoran Desert. Detailed Description

Photo © Mike Plagens

Pale yellow to cream-colored flowers with usually 5 petals and a series of up to five bracts with white centers and green margins directly below flower. Rocky slopes in spring. Detailed Description

White-stem Blazing Star

Mentzelia albicaulis

Sandpaper Plant

Petalonyx thurberi

Photo © Mike Plagens

Bright yellow flowers supported on whitish stems. Spring annual. Petals mostly less than 8 mm. Detailed Description

Photo © Mike Plagens

Short, deltoid shaped leaves are very rough and feel like sandpaper! Whitish flowers with complex morphology in a spike at ends of twigs. Below flowers on the spikes there may be few to many dead and bleached pale leaves or leaf-like bracts attached. Found in deep sand along washes or near river flood plains in the Sonoran Desert. Detailed Description


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Copyright Michael J. Plagens, 1999-2010