Jamesia tetrapetala

N. H. Holmgren & P. K. Holmgren

Brittonia 41: 348, fig. 3J–K. 1989.

Common names: Four-petal cliffbush
EndemicConservation concern
Treatment appears in FNA Volume 12. Treatment on page 466. Mentioned on page 464.

Stems 5–20(–40) dm. Bark exfoliating in gray, orangish gray, or brownish strips or strings. Branches spreading or descending, often stunted and straggly; twigs densely spreading- or retrorse-pilose. Leaves: petiole 1–4(–7) mm, ascending-strigose to canescent or sericeous; blade ovate or obovate, (0.5–)1–2(–2.7) × (0.2–)0.8–1.2(–1.6) cm, base obtuse to usually rounded, sometimes cuneate, usually asymmetric, margins usually dentate, rarely entire, teeth 3–13(–16), apex obtuse to rounded, abaxial surface moderately to densely canescent or sericeous, adaxial sparsely strigose to glabrescent. Inflorescences 1(–3)–flowered; peduncle 2–10 mm, canescent or subsericeous. Pedicels 1–5 mm, canescent or subsericeous. Flowers: hypanthium 2.5–3.5 × 1–1.5 mm, canescent or sericeous; sepals 4, lanceolate to deltate-ovate, (3–)5–9 × (1.5–)2–2.8 mm, margins usually entire, rarely 2-lobed apically, apex acute to obtuse, abaxial surface canescent or sericeous; petals 4, white with pinkish margin or entirely pink, 5–13(–15) × 3–4.9 mm, sparsely to densely strigose or canescent, especially distally; stamens 8; filaments (4–)5–8 × 0.8–1.4 mm; anthers 0.8–1.1 mm; styles 3–5, 4.8–7.7 mm. Capsules 3–5.5(–7) × 2.5–3.5 mm. Seeds 0.6–0.8 mm.


Phenology: Flowering Jun–Aug.
Habitat: Limestone cliffs, crevices, talus.
Elevation: 2000–3300 m.

Discussion

Jamesia tetrapetala is known from the Grant, Highland, and Snake ranges in eastern Nevada and the House Range in western Utah.

Selected References

None.

Lower Taxa

None.