Calylophus berlandieri

Common name: Square-bud Day Primrose, Sundrops
Family: Onagraceae 
Size: Up to 50 cm tall
Description: Upright to somewhat sprawling or reclining 
Habitat: Sandy or rocky soils, love sun

Flower:

• 5 cm across
• 4 petals, yellow, wrinkled
• stigma exserted beyond anthers
• Flowers several, borne in upper leaf axils
• Remain open during the day

Stem and leaves:

• Leaves up to 8 cm long
• wide, alternate, stalkless
• Margins entire to spiny-toothed
• Stems one to several and forming clumps
• Semi-woody