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Yavapai County Native & Naturalized Plants

Pterostegia drymarioides - woodland pterostegia

Synonyms: Pterostegia diphylla, P. diphylla var.biloba, P. microphylla
Other Common Names: woodland threadstem, fairy mist, fairy bowties, granny's hairnet, woodland wingcup
Plant Form: Forb or Subshrub

Family: Polygalaceae


   
 
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Forb Plant Description

Origin: Native   Life Cycle: Annual
General Desc: 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.
Identification notes: 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.
Height: To about 2 feet across


Habitat

Habitat Description: Found in open, often shaded areas in sandy or gravelly soils on slopes, among rocks or in chaparral woodlands.
Plant Communities: Desert Scrub, Interior Chaparral
Elevation: Below 3500 feet


Flower Characteristics

Color: Pale yellow to pink, bright pink     Shape: Inconspicuous in round clusters     Tubular: N     Flowering Period: Feb - Apr
Description: 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.


Leaf and Stem Characteristics

Leaf Color: Green or pinkish     Leaf Type: Simple     Leaf Shape: Round or oval     Leaf Margin: Other     Leaf Attachment: Opposite     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: 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.


Fruit and Seed Characteristics

Fruit Color: Reddish, light yellowish-brown   
Fruit Type: Achene
Fruit Notes: 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.
Seed Notes: 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.



  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
http://cales.arizona.edu/yavapaiplants/SpeciesDetailForb.php  
Last Updated: Dec 13, 2022
Content Questions/Comments: Email Matt Halldorson  
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