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Pterostegia drymarioides - woodland pterostegia

Scientific Family
Polygalaceae
Synonyms
Pterostegia diphylla, P. diphylla var.biloba, P. microphylla
Other common names
woodland threadstem
fairy mist
fairy bowties
granny's hairnet
woodland wingcup
Plant type
Forbs and Subshrubs
Origin
Native
Lifecycle
Annual
Height
To about 2 feet across
Riparian
No

Thin, hairy-stemmed annual spreading on the ground or sprawling along rocks and nearby vegetation; may be hidden beneath other plants. Small green or pinkish leaves are oval to fan-shaped. Very tiny bell-like flowers form small clusters at the stem tips.

Stems arise directly from the slender taproot, sprawling and spreading; stem leaves broadly oval to fan-shaped, margins smooth or lobed; flowers 2 to 3 per flower head, pale yellow to pink or bright pink, somewhat bell-shaped.

Habitat

Found in open, often shaded areas in sandy or gravelly soils on slopes, among rocks or in chaparral woodlands.

Plant Community
Desert Scrub
Interior Chaparral
Low elevation
0
High elevation
3500

Flower Characteristics

Flowers (2 to 3) grow in small rounded terminal clusters. The very tiny flower grows to about 1/16 inch and has 6 (rarely 5) petal-like sepals. Below the flower is a reddish, dry, 2-lobed (winged) leaf-like bract with a net-like pattern on its surface.

Flower color
Pale yellow to pink, bright pink
Flower shape
Inconspicuous
Tubular
No
First bloom month
February
Last bloom month
April
Flower clusters
Rounded

Leaf and Stem Characteristics

Few to many stems branch from the base and are covered with long, stiff hairs. Lower leaves are fan-shaped, often 2-lobed and 1/8 to 3/4 inch wide. Upper leaves are rounded, wider than long with a smooth or finely notched margin. Leaves have short stalks.

Leaf type
Simple
Leaf color
Green or pinkish
Leaf shape
Round or oval
Leaf margin
Other
Leaf attachment
Opposite
Leaves clasp
No
Leaf hairs
Leaves & stems
Spines
No

Fruit and Seed Characteristics

Fruit is smooth, shiny, 3-angled, oval to triangular, about 1/16 inch long and swollen on the back. Its outer layer forms "wings" (enlarged lobes) that extend outward from the sides. Fruit is loosely enclosed by the leaf-like bracts below the flower.

Fruit type
Achene
Fruit color
Reddish, light yellowish-brown

1 seed is produced in the fruit which does not split open at maturity to release the seed. However, the "wings" on the fruit aid in seed dispersal by the wind.