HARTWEG EVENING PRIMROSE
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| File Size: 140 KB |
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Oenothera hartwegii Benth.
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| [=Calylophus hartwegii (Benth. ) Raven] |
| Barber County, Kansas |
| Perennial |
| Height: 2-16 inches |
| Family: Onagraceae - Evening Primrose Family |
| Flowering Period: April, May, June, July |
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| Also Called: | | Hartweg's sundrops, fendler evening primrose. | | Stems: | | Decumbent or slightly ascending, 1 to several, usually branched, nearly glabrous throughout. | | Leaves: | | Alternate, simple, somewhat ascending, linear to oblanceolate or lanceolate, up to 2 inches long, less than 1/2 inch wide, glabrous; margins entire or serrate; tips pointed; stalks mostly absent; stem leaves sometimes have clusters of small leaves in axils. | | Inflorescences: | | Flowers in axils of upper leaves. | | Flowers: | | Sepals 4, each without keeled midrib, pale yellow, sometimes fade pinkish or orange; floral tube .5 to 2.5 inches long, lower half tubular ; petals 4, yellow, fading pinkish or purplish; stamens 8, nearly equal; style mostly longer than stamens; stigma flat, 4-sided, shield-shaped. | | Fruits: | | Capsule, cylindrical, .2 to 1.6 inch long, sessile; seeds less than 1/10 inch long. | | Habitat: | | Prairie hillsides, valleys, roadsides, and open woods; rocky or gravelly soils. | | Distribution: | | Southern portion of the southwest 1/4 of Kansas. | | Uses: | | The plant was used by the Navajo to treat internal bleeding. | | Comments: | | The flowers open in the late afternoon or near sunset. The related subspecies Calylophus hartwegii (Benth.) Raven ssp. pubescens (A. Gray) Towner & Raven is also found in the same area. It is usually covered with long spreading hairs. |
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| Hartweg evening primrose flower |  | | 86 KB | | Barber County, Kansas |
| | Hartweg evening primrose |  | | 128 KB | | Barber County, Kansas |
| | Hartweg evening primrose |  | | 105 KB | | Barber County, Kansas |
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