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Centrostegia thurberi - red triangles

Scientific Family
Polygonaceae
Synonyms
Centrostegia thurberi var. macrotheca, Chorizanthe thurberi, Chorizanthe thurberi var. macrotheca
Other common names
spring flower
Thurber's spine-flower
Thurber's spiny-herb
Plant type
Forbs and Subshrubs
Origin
Native
Lifecycle
Annual
Height
To nearly 8 inches
Riparian
No

Erect and low-growing from a basal cluster of spatula-shaped green to red leaves. Stems are often red, branched at or near the base with spreading branches. Tiny flowers are mostly hidden by the red triangle-shaped leaf-like bracts beneath them.

Low growing dichotomously branched (branches split into 2 parts) annual with basal leaves; leaves mostly without hairs; sepals narrow, and hairy; flowers mostly solitary; bracts below flowers with 3 broad, conspicuous spreading spurs at the base.

Habitat

Sandy to gravelly flats and slopes; mixed grassland, saltbush, creosote bush, and chaparral communities.

Plant Community
Desert Scrub
Interior Chaparral
Low elevation
0
High elevation
4000

Flower Characteristics

Flowers grow in loose clusters at the stem tips. Each flower is 1/16 to 1/8 inch long, hairy, has white to pink tepals (fused petals and sepals) and 6 lobes. Beneath each flower are red, spine-tipped 3-lobed bracts that resemble the shape of a triangle.

Flower color
White to pink
Flower shape
Bell-shaped
Tubular
Yes
First bloom month
March
Last bloom month
May
Flower clusters
Elongated

Leaf and Stem Characteristics

Leaves are 3/4 inch to 2 inches long, grow in a rosette (circular cluster) at the plant's base, are spatula-shaped (slender base, very broad tip) and almost stalkless. Both leaves and stems are minutely hairy; stems have sparse glands and are usually red.

Leaf type
Simple
Leaf color
Green to red
Leaf shape
Round or oval
Leaf margin
Smooth
Leaf attachment
Basal
Leaves clasp
No
Leaf hairs
Leaves & stems
Spines
No

Fruit and Seed Characteristics

Fruit is about 1/16 inch long, smooth, dry, brown and egg-shaped. It contains 1 seed and does not open to release the seed when mature.

Fruit type
Achene
Fruit color
Brown

Straw-colored seeds are globe-like on the bottom tapering to a point at the top resembling the shape of a teardrop.