Boechera drepanoloba

(Greene) Windham & Al-Shehbaz

Harvard Pap. Bot. 11: 263. 2007.

Basionym: Arabis drepanoloba Greene Pittonia 3: 306. 1898
Synonyms: Arabis drummondii var. oreophila (Rydberg) M. Hopkins Arabis lemmonii var. drepanoloba (Greene) Rollins Arabis oreophila Rydberg
Treatment appears in FNA Volume 7. Treatment on page 374. Mentioned on page 355, 360, 375.
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Perennials; short- to long-lived; apomictic; caudex usually not woody. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, 1–4 dm, glabrous or sparsely pubescent proximally, trichomes sessile or subsessile, 2- or 3-rayed, 0.1–0.3 mm, glabrous distally. Basal leaves: blade oblanceolate, 2–6 mm wide, margins entire, ciliate along petiole, trichomes (submalpighiaceous or simple), to 0.6 mm, surfaces sparsely to densely pubescent, trichomes subsessile, 2–6-rayed, 0.1–0.3 mm. Cauline leaves: 3–15, often concealing stem proximally; blade auricles 0.7–2.5 mm, surfaces of distalmost leaves usually glabrous. Racemes 5–25-flowered, usually unbranched. Fruiting pedicels horizontal to ascending, straight or curved, 4–8 mm, glabrous. Flowers ascending at anthesis; sepals glabrous or pubescent with scattered trichomes; petals purple to lavender, 6–8 × 1.5–2.5 mm, glabrous; pollen spheroid. Fruits horizontal to ascending, secund, straight to slightly curved, edges parallel, 3–5.8 cm × 2–3.5 mm; valves glabrous; ovules 44–76(–104) per ovary; style 0.05–0.5 mm. Seeds uniseriate, 1.5–2.2 × 1.2–1.6 mm; wing continuous, 0.3–0.7 mm wide.

Phenology: Flowering Jul–Aug.
Habitat: Rocky slopes and talus in alpine and subalpine habitats
Elevation: 2000-3800 m


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Alta., Alaska, Colo., Idaho, Mont., Oreg., Utah, Wash., Wyo.


Morphological evidence suggests that Boechera drepanoloba is an apomictic species that arose through hybridization between B. lemmonii and B. stricta (see M. D. Windham and I. A. Al-Shehbaz 2007 for detailed comparison).

Selected References


Lower Taxa

... more about "Boechera drepanoloba"
Ihsan A. Al-Shehbaz +  and Michael D. Windham +
(Greene) Windham & Al-Shehbaz +
Arabis drepanoloba +
Alta. +, Alaska +, Colo. +, Idaho +, Mont. +, Oreg. +, Utah +, Wash. +  and Wyo. +
2000-3800 m +
Rocky slopes and talus in alpine and subalpine habitats +
Flowering Jul–Aug. +
Harvard Pap. Bot. +
Arabis drummondii var. oreophila +, Arabis lemmonii var. drepanoloba +  and Arabis oreophila +
Boechera drepanoloba +
Boechera +
species +