Boechera crandallii

(B. L. Robinson) W. A. Weber

Phytologia 51: 369. 1982. 1982

Basionyms: Arabis crandallii B. L. Robinson Bot. Gaz. 28: 135. 1899
Synonyms: Arabis stenoloba Greene
Treatment appears in FNA Volume 7. Treatment on page 372. Mentioned on page 361, 393.

Perennials; long-lived; (often cespitose); sexual; caudex somewhat woody. Stems usually 2–5 per caudex branch, arising from margin of rosette near ground surface, (1–)1.5–4 dm, densely pubescent proximally, trichomes short-stalked, 5–8-rayed, 0.1–0.2 mm, moderately to sparsely pubescent distally. Basal leaves: blade narrowly oblanceolate, 1.5–3(–5) mm wide, margins entire, ciliate along petiole base, trichomes (simple), to 0.6 mm, surfaces densely pubescent, trichomes short-stalked, 5–8-rayed 0.1–0.2 mm. Cauline leaves: 5–14, not concealing stem; blade auricles 0.1–0.5 mm, surfaces of distalmost leaves pubescent. Racemes 10–30-flowered, usually unbranched. Fruiting pedicels ascending to divaricate-ascending, straight, 5–10 mm, pubescent, trichomes branched. Flowers ascending at anthesis; sepals pubescent; petals usually white, 5–7 × 1–2 mm, glabrous; pollen ellipsoid. Fruits ascending to divaricate-ascending, not appressed to rachis, not secund, straight, edges parallel, 3–5.5 cm × 0.9–1.2 mm; valves glabrous; ovules 56–84 per ovary; style 0.1–0.5 mm. Seeds uniseriate, 0.8–1 × 0.6–0.9 mm; wing continuous (rarely absent), to 0.1 mm wide. 2n = 14.


Phenology: Flowering May–Jun.
Habitat: Rocky slopes and gravelly soil in sagebrush, mountain shrub, open conifer forests
Elevation: 2000-2700 m

Discussion

Of conservation concern.

Boechera crandallii is a sexual diploid known only from the Gunnison Basin of west-central Colorado. Despite its narrow range, the species appears to hybridize frequently, most notably with B. pallidifolia.

Selected References

None.

Lower Taxa

None.

... more about "Boechera crandallii"
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(B. L. Robinson) W. A. Weber +
Arabis crandallii +
2000-2700 m +
Rocky slopes and gravelly soil in sagebrush, mountain shrub, open conifer forests +
Flowering May–Jun. +
Arabis stenoloba +
Boechera crandallii +
Boechera +
species +