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| Category: Perennial |
| Family: Onagraceae (Evening-primroses) |
| Origin: North America |
| Evergreen: Yes |
| Flower Color: Yellow |
| Bloomtime: Spring/Summer |
| Synonyms: [C. drummondianus var. berlandieri] |
| Height: <1 foot |
| Width: 2-3 feet |
| Exposure: Full Sun |
| Summer Dry: Yes |
| Irrigation (H2O Info): Low Water Needs |
| Winter Hardiness: < 0 °F |
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Calylophus berlandieri (Sundrops) A long living evergreen, low-growing woody-based perennial (technically a subshrub) that grows to 1 foot tall and spreads to nearly 3 feet wide with dark green narrow fine-textured soft foliage and bright yellow 1 to 2 inch wide flowers in spring and early summer - particularly long blooming in Southern California gardens with bloom extending into the fall. Plant in full sun or half day sun in a well-drained soils with occasional to infrequent irrigation. This plant is evergreen in frost-free areas but cold hardy with only tip damage in most frosts and returning from its woody base after a hard freeze and root hardy to at least 0°F. Prune plants back to near their base in early spring and tip back after flowering to regenerate growth and flowers - flowering also corresponds with rain or irrigation so plants can rebloom later with some irrigation. A great plant for containers and dry gardens, particularly hot spots in the garden and on slopes. It will drape over and cascade down a couple feet from a container lip or wall. Calylophus berlandieri is a North American native that comes from the grasslands of New Mexico, Oklahoma, Texas and south into Mexico. The genus name was given to this group of plants in 1835 by French botanist Édouard Spach (1801- 1879) to distinguish them from the closely related genus Oenothera, the Evening Primroses. The name is from the Greek words 'caly' for "calyx" and 'lophos' meaning the "the back of the neck", "a crest of a hill" or "helmet" to describe the unique crested lobes on the sepals. Though often listed differently the current correct name according to The Plant List for this species is Calylophus berlandieri, a name honoring the French naturalist Jean-Louis Berlandier (1801-1851). More commonly this plant is listed as Calylophus drummondii or C. drummondianus to honor Thomas Drummond, a British botanist sent by The Royal Botanic Garden at Kew to collect plants in Texas. Other names include C. drummondianus var. berlandieri and Calylophus berlandieri ssp. pinifolius. The common names Shrubby Primrose and Texas Sundrop are also associated with this plant.
This information about Calylophus berlandieri displayed is based on research conducted in our horticultural library and from reliable online resources. We also will relate observations made about it as it grows in our nursery gardens and other gardens we have visited, as well how the crops have performed in containers in our nursery field. We will also incorporate comments that we receive from others and we welcome hearing from anyone with additional information, particularly if they can share any cultural information that would aid others in growing it.
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