|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
|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
Map Color Key
Banner photo of Lupinus ssp. by Rick Capozza, Austin TX
© Tom Lebsack 2023