STENOSIPHON
File Size: 79 KB
 
Stenosiphon linifolius   (Nutt. ex James) Heynh.
Russell County, Kansas
Biennial
Height: 2-9 feet
Family: Onagraceae - Evening Primrose Family
Flowering Period:   July, August, September
Stems: Erect, 1-3, slender, wiry-branched in inflorescence, waxy, usually glabrous to inflorescence, somewhat brittle.
Leaves: Alternate, simple, sessile, lanceolate, 1 to 3 inches long, 1/4 to 3/4 inch wide, glabrous; margins entire, whitish; tips pointed; lower leaves often absent at flowering; upper leaves reduced, linear-lanceolate.
Inflorescences: Spikes, elongate, terminal, glandular-hairy.
Flowers: About 1/2 inch across, sessile; sepals 4, oblong-lanceolate, whitish, sparsely pubescent, bent abruptly backward; petals 4, less than 1/4 inch long, white, clawed, at end of threadlike floral tube; stamens 8, unequal; style as long or longer than stamens, stigma 4-lobed.
Fruits: Capsules, nutlike, egg-shaped, conspicuously ribbed, pubescent, 1-seeded; seeds small, whitish yellow.
Habitat: Dry, rocky, prairie hillsides, roadsides, stream valleys, and waste places, most abundant on limestone soils.
Distribution: Throughout Kansas.
Comments: Stenosiphon drops its leaves during periods of drought and conducts photosynthesis in the stem. A rosette of leaves develops in the fall of the first year, and the stem arises in the second year.

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