Boechera paddoensis |
Boechera californica |
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Mount Adams rock-cress, Mt. Adams rock-cress |
California rockcress |
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Habit | Perennials; long-lived; (cespitose); apomictic; caudex usually woody. | Perennials; usually long-lived; apomictic; caudex woody. |
Stems | 1–3 per caudex branch, arising from center of rosette near ground surface, or arising laterally proximal to sterile shoots, 1–2.5 dm, glabrous throughout. |
usually 1 per caudex branch, arising from center of rosette, elevated above ground surface on woody base, (2–)3.5–13 dm, densely pubescent proximally, trichomes short-stalked, 2–4-rayed, 0.3–0.9 mm, moderately to sparsely pubescent distally. |
Basal leaves | blade narrowly oblanceolate, 1–3(–6) mm wide, margins usually entire, rarely apically few-toothed, not ciliate, surfaces sparsely pubescent, trichomes short-stalked, 4–8-rayed, 0.08–0.2 mm. |
blade linear to oblanceolate, 3–10(–13) mm wide, margins entire or denticulate, ciliate along petiole, trichomes to 1.3 mm, surfaces densely pubescent, trichomes short-stalked, 4–8-rayed, 0.2–0.5 mm. |
Cauline leaves | 4–8, not concealing stem; blade auricles 1–2 mm, surfaces of distalmost leaves glabrous. |
12–35(–55), often concealing stem proximally; blade auricles 1–5(–6) mm, surfaces of distalmost leaves pubescent. |
Racemes | 5–12(–18)-flowered, usually unbranched. |
30–120-flowered, usually unbranched. |
Flowers | ascending at anthesis; sepals glabrous; petals lavender to purple, 4–5.5 × 1–1.5 mm, glabrous; pollen spheroid. |
divaricate-ascending at anthesis; sepals pubescent; petals usually purple, rarely pinkish, 9–14 × 1.5–3 mm, glabrous or sparsely pubescent (trichomes scattered abaxially); pollen spheroid. |
Fruiting pedicels | usually divaricate-ascending, rarely horizontal, straight, 2–5(–10) mm, glabrous. |
descending to horizontal, usually recurved, rarely straight, 4–20 mm, pubescent, trichomes appressed, 3–7-rayed. |
Fruits | usually divaricate-ascending, rarely horizontal, not appressed to rachis, secund (often weakly so), straight, edges parallel, 3–5.5 cm × 1.5–2 mm; valves glabrous; ovules 42–54 per ovary; style 0.05–0.1 mm. |
widely pendent, not appressed to rachis, not secund, usually curved, rarely straight, edges parallel, (6–)8–12 cm × 1.5–2.5 mm; valves glabrous or trichomes sometimes scattered; ovules 140–180 per ovary; style 0.05–0.3 mm. |
Seeds | uniseriate, 1.1–1.5 × 0.9–1.3 mm; wing continuous, 0.1–0.3 mm wide. |
uniseriate or sub-biseriate, 1.7–2 × 1.2–1.7 mm; wing continuous, 0.2–0.4 mm wide. |
Boechera paddoensis |
Boechera californica |
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Phenology | Flowering Jul–Aug. | Flowering Mar–Jun. |
Habitat | Rocky ridges | Rocky slopes and gravelly soil in desert chaparral and oak woodlands |
Elevation | 1500-2100 m (4900-6900 ft) | 300-2300 m (1000-7500 ft) |
Distribution |
OR; WA
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CA; Mexico (Baja California)
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Discussion | Morphological evidence suggests that Boechera paddoensis is an apomictic species that arose through hybridization between B. lemmonii and B. lyallii (see M. D. Windham and I. A. Al-Shehbaz 2007 for detailed comparison). Boechera paddoensis is known only from the mountains of central Washington and northeastern Oregon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Morphological evidence suggests that Boechera californica is an apomictic species that arose through hybridization between B. arcuata and B. pulchra (see M. D. Windham and I. A. Al-Shehbaz 2007 for detailed comparison). In the flora area, B. californica is known only from Los Angeles, Riverside, San Bernardino, and San Diego counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 392. | FNA vol. 7, p. 369. |
Parent taxa | Brassicaceae > tribe Boechereae > Boechera | Brassicaceae > tribe Boechereae > Boechera |
Sibling taxa | ||
Synonyms | Arabis lemmonii var. paddoensis | Arabis sparsiflora var. californica |
Name authority | (Rollins) Windham & Al-Shehbaz: Harvard Pap. Bot. 11: 268. (2007) | (Rollins) Windham & Al-Shehbaz: Harvard Pap. Bot. 11: 260. (2007) |
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