Tetrapteron graciliflorum

(Hooker & Arnott) W. L. Wagner & Hoch

Syst. Bot. Monogr. 83: 214. 2007.

Common names: Hill suncup
Basionym: Oenothera graciliflora Hooker & Arnott Bot. Beechey Voy., 341. 1839
Synonyms: Camissonia graciliflora (Hooker & Arnott) P. H. Raven Taraxia graciliflora (Hooker & Arnott) Raimann
Treatment appears in FNA Volume 10.
Please click on the illustration for a higher resolution version.
Illustrator:

Copyright:

Herbs densely pilose. Stems rarely with ascending lateral branches to 2.5 cm. Leaves: blade linear to very narrowly lanceolate, 1–9.8 ×0.1–0.9 cm, dilated at base, margins entire or very sparsely serrulate. Flowers opening near sunrise; floral tube 1.6–3.2 mm; sepals 4.5–8 mm; petals 5–18 mm; episepalous filaments 1.8–3.2 mm, epipetalous filaments 0.8–1.6 mm; sterile projection of ovary 6–45 mm; style 3–5.5 mm, short-hairy near base; stigma 1–1.6 mm diam., surrounded by anthers of longer stamens at anthesis. Capsules irregularly obovoid, sharply 4-angled, thick-walled, somewhat woody, with pointed wing near center-top of each valve, 4–8 × 2.6–4.8 mm, tardily dehiscent in distal 1/3. Seeds tan with dark splotches, obovoid, 1.2–2 mm. 2n = 14.


Phenology: Flowering Mar–May.
Habitat: Colonial on open or brushy slopes, on clay soil, grasslands, Yucca or juniper and oak shrublands.
Elevation: 0–800 m.

Distribution

Calif., Oreg., Mexico (Baja California).

Discussion

Tetrapteron graciliflorum is rare in Oregon, known only from a few collections in Jackson and Josephine counties. In Baja California, Mexico, it is known only from Rancho Aguajito.

Selected References

None.

Lower Taxa

None.
... more about "Tetrapteron graciliflorum"
Warren L. Wagner +
(Hooker & Arnott) W. L. Wagner & Hoch +
Oenothera graciliflora +
Hill suncup +
Calif. +, Oreg. +  and Mexico (Baja California). +
0–800 m. +
Colonial on open or brushy slopes, on clay soil, grasslands, Yucca or juniper and oak shrublands. +
Flowering Mar–May. +
Syst. Bot. Monogr. +
Camissonia graciliflora +  and Taraxia graciliflora +
Tetrapteron graciliflorum +
Tetrapteron +
species +