Rayjacksonia annua
Amer. J. Bot. 83: 368. 1996.
Common names: Viscid camphor-daisy
Endemic
Basionym: Sideranthus annuus Rydberg Bull. Torrey Bot. Club 31: 653. 1905
Synonyms: Haplopappus annuus (Rydberg) Cory Machaeranthera annua (Rydberg) Shinners
Treatment appears in FNA Volume 20. Treatment on page 438.
Annuals, 20–100 cm, herbaceous or suffrutescent. Leaf blades oblanceolate to oblong or oblong-lanceolate, mid-cauline (1–)4–15(–25) mm wide. Heads on short, sometimes bracteate peduncles, not surpassed by distal leaves. Involucres (4.5–)6–9 × 9–15(–20) mm. Phyllaries in 3–4 series, loose, strongly unequal, apices broadly spreading to squarrose, ca. 0.9–1 mm wide, herbaceous. Ray florets (13–)20–36; corollas 6–11(–14) mm. Disc florets: corolla tubes ± equaling limbs. 2n = 12.
Phenology: Flowering (Jul–)Aug–Oct.
Habitat: Sand or sandy loam, prairies, stream sides and bottoms, alkaline flats, salt marsh edges, roadsides
Elevation: 1000–1700 m
Distribution
Colo., Kans., Nebr., N.Mex., Okla., Tex., Wyo.
Discussion
Selected References
None.
Lower Taxa
None.