Boechera puberula |
Boechera lyallii |
|
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Blue Mountain rockcress, hoary rock-cress, silver rockcress |
jewelled suncress, Lyall's rockcress, Lyall's slender rock-cress, murry's rockcress |
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Habit | Perennials; short-lived; sexual; caudex not woody. | Perennials; long-lived; (cespitose); sexual or apomictic; caudex woody. |
Stems | usually 1 per caudex branch, arising from center of rosette near ground surface, (1–)2–6.3 dm, densely pubescent proximally, trichomes short-stalked, 3–8-rayed, 0.1–0.3(–0.5) mm, similarly pubescent distally. |
usually 1 per caudex branch, arising from center of rosette near ground surface, 0.3–1.5(–2) dm, glabrous throughout. |
Basal leaves | blade oblanceolate to linear-oblanceolate, 1.5–5 mm wide, margins usually dentate, not ciliate, surfaces densely pubescent, trichomes short-stalked, 5–12-rayed, 0.05–0.2 mm. |
blade linear-oblanceolate, 1–5(–8) mm wide, margins entire, usually ciliate at least proximally, trichomes (simple and/or short-stalked, 2- or 3-rayed), 0.1–0.3 mm, surfaces (sometimes the entire leaf) usually glabrous or (rarely, the youngest leaves of sterile shoots) pubescent, trichomes 4–6-rayed, 0.05–0.1 mm. |
Cauline leaves | 7–45(–65), concealing stem proximally; blade auricles absent or 0.7–3 mm, surfaces of distalmost leaves pubescent. |
1–5, usually not concealing stem; blade auricles 0.5–1.5 mm or, rarely, absent, surfaces glabrous. |
Racemes | 10–40(–64)-flowered, usually unbranched. |
2–10(–15)-flowered, unbranched. |
Flowers | ascending to descending at anthesis; sepals pubescent; petals white to lavender, 5–9 × 0.8–1.8 mm, glabrous; pollen ellipsoid. |
erect at anthesis; sepals glabrous; petals lavender to purplish, 6–8.5 × 1.5–3 mm, glabrous; pollen ellipsoid or spheroid. |
Fruiting pedicels | pendent, recurved distal to horizontal to ascending base, 4–10 mm, pubescent, trichomes appressed, branched. |
erect, straight, 3–8(–15) mm, glabrous. |
Fruits | closely pendent, rarely appressed to rachis, sometimes somewhat secund, usually straight, edges parallel, 3–6.5 cm × 1.9–2.2 mm; valves pubescent throughout; ovules 38–64 per ovary; style 0.05–0.1 mm. |
erect, appressed to rachis, not secund, straight, edges parallel, 3–5.6 cm × 1.5–2.5 mm; valves glabrous; ovules 34–64 per ovary; style 0.1–0.7 mm. |
Seeds | uniseriate, 1.4–1.8 × 1–1.4 mm; wing continuous, 0.1–0.3 mm wide. |
biseriate or sub-biseriate, 1.5–2 × 1–1.5 mm; wing continuous, 0.3–0.5 mm wide. |
2n | = 14. |
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Boechera puberula |
Boechera lyallii |
|
Phenology | Flowering Apr–Jul. | Flowering Jun–Aug. |
Habitat | Ledges, rocky slopes, gravelly hillsides in sagebrush, pinyon-juniper, and mountain shrub communities | Cliffs, talus slopes, gravelly soil in alpine and subalpine habitats |
Elevation | 1300-2900 m (4300-9500 ft) | 1400-3700 m (4600-12100 ft) |
Distribution |
CA; NV; OR; UT
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CA; ID; MT; NV; OR; UT; WA; BC; YT
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Discussion | Boechera puberula is a diploid species that appears to intergrade with both B. retrofracta and B. subpinnatifida. The glabrous-fruited specimens discussed by R. C. Rollins (1993) represent apomictic hybrids with other species, primarily B. pendulocarpa. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The taxon traditionally treated as Arabis (Boechera) lyallii var. nubigena is here segregated as B. paupercula (see M. D. Windham and I. A. Al-Shehbaz 2006 for detailed comparison). Completely glabrous individuals of B. lyallii are sometimes confused with B. davidsonii, but they are easily distinguished by the absence of persistent leaf bases on caudex branches, erect and appressed (versus ascending) fruits, and biseriate to sub-biseriate (versus uniseriate) seeds. Both sexual and apomictic collections are known; further study is needed to determine whether they truly are conspecific. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 399. | FNA vol. 7, p. 389. |
Parent taxa | Brassicaceae > tribe Boechereae > Boechera | Brassicaceae > tribe Boechereae > Boechera |
Sibling taxa | ||
Synonyms | Arabis puberula, Arabis arida, Arabis beckwithii, Arabis lignipes var. impar, Arabis sabulosa, Arabis subpinnatifida var. beckwithii, Arabis subpinnatifida var. impar, B. beckwithii | Arabis lyallii, Arabis armerifolia, Arabis densa, Arabis drummondii var. alpina, Arabis drummondii var. lyallii, Arabis multiceps, Arabis murrayi |
Name authority | (Nuttall) Dorn: Brittonia, 55: 3. (2003) | (S. Watson) Dorn: Vasc. Pl. Wyoming ed. 3, 376. (2001) |
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