Rayjacksonia aurea

(A. Gray) R. L. Hartman & M. A. Lane
Amer. J. Bot. 83: 369. 1996.
Common names: Houston camphor-daisy
EndemicConservation concern
Basionym: Haplopappus aureus A. Gray Mem. Amer. Acad. Arts, n. s. 4: 76. 1849 (as Aplopappus)
Synonyms: Machaeranthera aurea (A. Gray) Shinners
Treatment appears in FNA Volume 20. Treatment on page 438.

Annuals, 20–100 cm, herbaceous. Leaf blades linear to linear-oblanceolate, mid-cauline 1–3(–4) mm wide. Heads on short, sometimes bracteate peduncles, not surpassed by distal leaves. Involucres 4–7 × 10–15 mm. Phyllaries in 4–5 series, tightly appressed, strongly unequal, apices erect to slightly spreading, ca. 1 mm wide, herbaceous. Ray florets 14–19; corollas 6.5–9.5 mm. Disc florets: corolla tubes ± equaling limbs. 2n = 12.


Phenology: Flowering Oct–Nov(–Dec).
Habitat: Sand or sandy loam, fields, pastures, usually relatively bare sites
Elevation: 0–10 m

Discussion

Of conservation concern.

Rayjacksonia aurea is now restricted to a few, small populations in the vicinity of Houston. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.

... more about "Rayjacksonia aurea"
Guy L. Nesom +
(A. Gray) R. L. Hartman & M. A. Lane +
Haplopappus aureus +
Houston camphor-daisy +
0–10 m +
Sand or sandy loam, fields, pastures, usually relatively bare sites +
Flowering Oct–Nov(–Dec). +
Amer. J. Bot. +
Endemic +  and Conservation concern +
Machaeranthera aurea +
Rayjacksonia aurea +
Rayjacksonia +
species +