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| Scientific Name | Oenothera albicaulis | USDA PLANTS Symbol |
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| Common Name | Whitest Evening Primrose, Prairie Evening Primrose | ITIS Taxonomic Serial No. |
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| Family | Onagraceae (Evening Primrose) | SEINet Reference |
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| Description |
Habitat: Dry, sandy soils in open flats and slopes. Plant: Annual usually branching from base, with erect central stem 2 to 12 inches tall and spreading, decumbent lateral stems up to 20 inches long. Leaves: Basal rosette leaves often fall off prior to flowering, spatulate, oblanceolate, or ovate, 2 to 4 inches long and up to 1 inch wide, with a smooth or toothed margin; stem leaves alternate, lanceolate to oblanceolate in outline, usually pinnatifid into narrow lobes, and smaller than basal leaves. Inflorescence: Solitary white, showy flowers up to 3-1/4 inches wide opening near sunset, mature blossoms nodding; pedicels up to 1-5/8 inches long arising from leaf axils; floral tube 3/8 to 1-5/8 inches long; 4 sepals per flower, 3/8 to 1-1/4 inches long; 4 white petals fading to pink. Bloom Period: April to June. References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, "Wildflowers of Texas" by Michael Eason and SEINet. |
BONAP Distribution Map |
Texas Status: Native |
| Scientific Name | Oenothera berlandieri ssp. pinifolia (Calypholus berlandieri ssp. pinifolius, Calypholus drummondianus ssp. drummondianus) |
USDA PLANTS Symbol | CABEP2 |
| Common Name | Square-bud Primrose, Berlandieri's Sundrops | ITIS Taxonomic Serial No. | 836105 |
| Family | Onagraceae (Evening Primrose) | Wildflower Center Ref. | Click Here |
| Description | Habitat: Sandy or rocky soils in open areas, plains, brushlands. Plant: Erect slightly bushy perennial, reddish-brown stems 6 to 24 inches tall. Leaves: Sessile to short-petiolate, linear to oblanceolate leaves less than 1/2 to 3 inches long with shallow teeth along edges. Inflorescence: Yellow flowers 1 to 2 inches across with yellow stamens and yellow stigma as long or longer than stamens; stigma and hypanthium usually black; flowers opening near sunrise. Bloom Period: March to July. References: Calypholus drummondianus ssp. drummondianus in "Manual of the Vascular Plants of Texas" by Correll and Johnston and Oenothera berlandieri ssp. pinifolia in "Wildflowers of Texas" by Michael Eason. |
BONAP Distribution Map |
Texas Status: Native |
| Scientific Name | Oenothera hartwegii (Calylophus hartwegii) | USDA PLANTS Symbol | CAHA14 |
| Common Name | Hartweg's Sundrops | ITIS Taxonomic Serial No. | 517700 |
| Family | Onagraceae (Evening Primrose) | SEINet Reference |
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| Description | Habitat: Sandy and limestone soils in various ecologies including deserts, plains, foothills and canyons. Plant: Bushy perennial herb from a woody caudex; stems woody near the base, ascending to almost erect, somewhat branched; 4 to 16 inches tall. Leaves: Alternate, sessile stem leaves with linear to oblong-lanceolate, 3/8 to 2 inches long and 3/16 to 3/8-inch wide; edges entire to denticulate; leaf surfaces smooth, hairy, or glandular-hairy. Inflorescence: Arising from the upper leaf axils, solitary, showy flowers 3/4 to 2+ inches across, with 4 yellow petals becoming reddish; 8 yellow stamens and prominent yellow stigma; 4 sepals reflexed beneath; floral tube 5/8 to 2-1/8 inches long; flower opens in the afternoon or near sunset. Bloom Period: March to October. References: "Manual of the Vascular Plants of Texas" by Correll and Johnston and SEINet. |
BONAP Distribution Map |
Texas Status: Native |
| Scientific Name | Oenothera serrulata (Calypholus serrulatus) | USDA PLANTS Symbol | CASE12 |
| Common Name | Yellow Sundrops | ITIS Taxonomic Serial No. | 517736 |
| Family | Onagraceae (Evening Primrose) | SEINet Reference |
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| Description | Habitat: Rocky, sandy soils in open areas, prairies, roadsides. Plant: Erect bushy perennial with multiple stems from a woody base, may be rough-looking with remnants of previous year's dried stems and branches; up to 2 feet tall. Leaves: Alternate, linear to narrowly oblong or oblanceolate, sessile, 0.8 to 2.4 inches long with serrulate or (rarely) smooth edges. Inflorescence: Yellow funnel-shaped blossoms arising from upper leaf axils opening in the morning; 4 rounded petals spreading from 0.5 to nearly 1 inch across; stigma is slightly 4-lobed; 8 stamens. Bloom Period: April to July. References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, "Wildflowers of Texas" by Michael Eason SEINet. |
BONAP Distribution Map |
Texas Status: Native |
