Plant Image
Flowers
- Sue Smith


Yavapai County Native & Naturalized Plants

Calylophus serrulatus - yellow sundrops

Synonyms: Oenothera serrulata, Calylophus australis, Meriolix serrulata, Meriolix intermedia, Meriolix oblanceolata
Other Common Names: yellow evening primrose, halfshrub sundrop, plains evening primrose
Plant Form: Forb or Subshrub

Family: Onagraceae


   
 
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Leaves
Sue Smith
Plant
Sue Smith
Forb Plant Description

Origin: Native   Life Cycle: Perennial
General Desc: Subshrub with many branches and an upright bushy growth pattern; grows into large clump, woody only at the base. Flowers open in the morning and close in late afternoon fading from yellow to orange or pink with age. Leaves may stay green in mild winters.
Identification notes: Stems typically clustered, woody below, often covered with short stiff appressed hairs; leaves numerous, narrow; floral cup funnel-form, yellow, open daytime, sessile, upper axils, stigma disc-like, often shallowly 4-lobed; stamens unequal.
Height: 4 to 20 inches


Habitat

Habitat Description: Sandy and rocky areas, dry open plains, prairies and bluffs.
Plant Communities: Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest
Elevation: 4000 - 7000 feet


Flower Characteristics

Color: Yellow, orange or pink with age     Shape: Regular not in clusters     Tubular: Y     Flowering Period: Jun - Jul
Description: Flowers single, 1/2 to 1 inch across with 4 rounded petals that are often wrinkled like crumpled tissue paper with wavy edges and a rounded notch at the tip; flowers are stalkless but sit on top of a hairy, funnel-shaped floral tube resembling a stalk.


Leaf and Stem Characteristics

Leaf Color: Grayish-green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Toothed     Leaf Attachment: Alternate     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: Linear leaves are 3/4 to 2-1/2 inches long with short, fine, gray or white hairs(canescent);leaf margins are often sharply toothed but can be smooth; leaves can be stalkless (sessile) or have a short stalk (petiole). Green to brown stems have stiff hairs.


Fruit and Seed Characteristics

Fruit Color: Gray, white   
Fruit Type: Capsule
Fruit Notes: Linear, cylindrical, stemless capsule is roundly 4-angled, 1/2 to 1 inch long and covered with short, fine, gray or white hairs; fruit is dry and splits open when ripe, releasing many seeds.
Seed Notes: Seeds are 1/16 inch long, dark-colored and sharply-angled.



  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
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