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Calylophus berlandieri (Berlandier's sundrops )
Mathews, Ray

Calylophus berlandieri

Calylophus berlandieri Spach

Berlandier's Sundrops , Square-bud Primrose, Sundrops

Onagraceae (Evening Primrose Family)


USDA Symbol: CABE6

USDA Native Status: L48 (N)

The showy, yellow flowers of Berlandier’s Sundrops are 2 inches across with four, broad, crinkled petals. This is a bushy, 4-20 inch plant that sometimes becomes woody near the base. Its leaves are narrow and spiny-toothed.

This is an excellent rock garden plant. Named for French-Swiss physician Jean Louis Berlandier (1805-1851) who collected plants in Texas and northern Mexico.


From the Image Gallery

39 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Leaf Retention: Deciduous
Fruit Type: Capsule
Size Notes: Up to about 20 inches tall.

Bloom Information

Bloom Color: Yellow
Bloom Time: Mar , Apr , May , Jun , Jul , Aug , Sep


USA: CO , KS , LA , NM , OK , TX
Native Distribution: S.w. KS through e. NM, OK & TX to n. Mex.; also Gulf states to AL
Native Habitat: Plains; woodland edges; roadsides

Growing Conditions

Water Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Moist
Heat Tolerant: yes
Soil Description: Sandy or rocky soils.
Conditions Comments: This is an excellent rock garden plant. The showy, yellow flowers of Berlandier's sundrops are 2 in. across with four, broad, crinkled petals. It is a bushy plant that sometimes becomes woody near the base. Its leaves are narrow and spiny-toothed.


Conspicuous Flowers: yes
Nectar Source: yes
Deer Resistant: Moderate


Propagation Material: Seeds
Description: Propagation by seed is most successful if sown in fall. Take cuttings on new growth in early spring, sometimes in January.
Commercially Avail: yes

Mr. Smarty Plants says

Small shrub to plant in Austin Texas
March 11, 2009
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Sedges and ornamentals for shade in Bastrop County
June 20, 2007
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List of native perennial Texas flowers
March 13, 2006
Good day, I am searching for a list of native Texas flowers (preferably perennials) for a flower garden. Thank you.
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From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Fredericksburg Nature Center - Fredericksburg, TX
Lady Bird Johnson Wildflower Center - Austin, TX
Brackenridge Field Laboratory - Austin, TX
NPSOT - Fredericksburg Chapter - Fredericksburg, TX
NPSOT - Austin Chapter - Austin, TX
NPSOT - Williamson County Chapter - Georgetown, TX

Herbarium Specimen(s)

NPSOT 0580 Collected May 11, 1990 in Bexar County by Harry Cliffe
NPSOT 0146 Collected Apr. 26, 1991 in Bexar County by Lottie Millsaps
NPSOT 0403 Collected Jun 6, 1993 in Comal County by Mary Beth White

3 specimen(s) available in the Digital Herbarium

Wildflower Center Seed Bank

LBJWC-MLE-1 Collected 2009-06-13 in Lampasas County by Lady Bird Johnson Wildflower Center

1 collection(s) available in the Wildflower Center Seed Bank

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Calylophus berlandieri in USDA Plants
FNA: Find Calylophus berlandieri in the Flora of North America (if available)
Google: Search Google for Calylophus berlandieri


Record Modified: 2023-04-19
Research By: TWC Staff

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