Boechera tiehmii

(Rollins) Al-Shehbaz

Novon 13: 389. 2003.

Basionym: Arabis tiehmii Rollins J. Arnold Arbor. 64: 496, fig. 2. 1983
Treatment appears in FNA Volume 7. Treatment on page 410. Mentioned on page 351, 356.

Perennials; long-lived; sexual; caudex woody (covered by persistent leaf bases). Stems usually 2–5 per caudex branch, arising from margin of rosette near ground surface, 0.8–2(–3) dm, glabrous throughout. Basal leaves: blade oblanceolate, (2–)3–7 mm wide, margins usually entire, rarely denticulate, ciliate, trichomes (simple and short-stalked) 2- or 3-rayed, 0.2–0.4 mm, surfaces glabrous. Cauline leaves: 3–5, not concealing stem; blade auricles absent or, rarely, to 0.5 mm, surfaces of distalmost leaves glabrous. Racemes 10–16-flowered, usually unbranched. Fruiting pedicels ascending, straight, 3–7 mm, glabrous. Flowers ascending at anthesis; sepals glabrous; petals white to lavender, 4–5 × 1.2–1.7 mm, glabrous; pollen ellipsoid. Fruits ascending, not appressed to rachis, not secund, straight, edges parallel, 1.5–3.7 cm × 1.4–1.7 mm; valves glabrous; ovules 14–22 per ovary; style 0.2–0.6 mm. Seeds uniseriate, 1.7–2.2 × 1–1.2 mm; wing absent or distal, 0–0.5 mm wide.


Phenology: Flowering Jun–Aug.
Habitat: Rock outcrops and gravelly soils in alpine and subalpine habitats
Elevation: 3000-3500 m

Discussion

Of conservation concern.

Boechera tiehmii is a sexual species considered by R. C. Rollins (1993) to be related to Arabis (Boechera) davidsonii. It is known only from Mono County, California, and Washoe County, Nevada.

Selected References

None.

Lower Taxa

None.