Boechera glaucovalvula |
Boechera spatifolia |
|
---|---|---|
bluepod rockcress |
spoonleaf rockcress |
|
Habit | Perennials; short- to long-lived; sexual; caudex usually not woody. | Perennials; short- to long-lived; sexual; caudex usually not woody (rarely with persistent, crowded leaf bases). |
Stems | usually 1 per caudex branch, arising from center of rosette near ground surface, (0.6–)1–4.5 dm, densely pubescent proximally, trichomes short-stalked, 4–8-rayed, 0.1–0.4 mm, similarly pubescent distally. |
simple or few to several per caudex branch, arising from center of rosette near ground surface, 1.5–3.5(–5) dm, densely pubescent proximally, trichomes simple mixed with short-stalked ones, 2-rayed, 0.3–0.7 mm. |
Basal leaves | blade linear to linear-oblanceolate, 2–4(–6) mm wide, margins entire, usually ciliate at petiole base, trichomes (simple or spurred), to 1.5 mm, surfaces densely pubescent, trichomes short-stalked, 4–8-rayed, 0.1–0.4 mm. |
blade narrowly oblanceolate, 1.5–3(–4) mm wide, margins entire, strongly ciliate at least along petiole, trichomes (simple), to 1 mm, surfaces glabrous or sparsely pubescent, trichomes simple and short-stalked, 2-rayed, 0.3–0.7 mm. |
Cauline leaves | 6–10, not concealing stem; blade auricles absent, surfaces of distalmost leaves densely pubescent. |
5–15(–20), often concealing stem proximally; blade auricles 0.5–1.5 mm, surfaces of distalmost leaves usually glabrous. |
Racemes | (5–)10–25-flowered, usually unbranched. |
10–30-flowered, usually unbranched. |
Flowers | divaricate at anthesis; sepals pubescent; petals light purple to lavender, 6–9 × 1.5–2.5 mm, glabrous; pollen ellipsoid. |
divaricate-ascending at anthesis; sepals pubescent; petals usually white, rarely pale lavender, 3–3.7(–4) × 0.5–0.8 mm, glabrous; pollen ellipsoid. |
Fruiting pedicels | reflexed, strongly curved at base, 2–10 mm, pubescent, trichomes appressed, branched. |
horizontal or slightly descending, curved or angled downward, 6–10(–15) mm, usually glabrous, rarely sparsely pubescent, trichomes spreading, simple. |
Fruits | strongly reflexed, sometimes appressed to rachis, often secund, straight, edges parallel, (1.8–)2.5–4.5 cm × 5–8 mm; valves glabrous; ovules 24–62 per ovary; style 0.2–0.6 mm. |
pendent, not appressed to rachis, rarely slightly secund, straight or gently curved, edges parallel, 3.3–5.7 cm × 1.2–1.8 mm; valves glabrous; ovules 90–126 per ovary; style 0.1–0.4 mm. |
Seeds | biseriate, 5–6 × 4–5 mm; wing continuous, 1.8–2.5 mm wide. |
biseriate, 0.7–0.9 × 0.5–0.6 mm; wing distal or, sometimes, absent, 0.05–0.1 mm wide. |
2n | = 14. |
= 14. |
Boechera glaucovalvula |
Boechera spatifolia |
|
Phenology | Flowering Mar–Apr. | Flowering May–Aug. |
Habitat | Rocky slopes and gravelly soil, usually under shelter of desert shrubs | Rocky slopes and gravelly soil in sagebrush, pinyon-juniper woodlands, open conifer forests and subalpine meadows |
Elevation | 600-1600 m (2000-5200 ft) | 1800-2800 m (5900-9200 ft) |
Distribution |
CA; NV
|
CO; NM
|
Discussion | Boechera glaucovalvula, a distinctive sexual diploid that has the widest fruits in the genus, is known from Inyo, Mono, Riverside, and San Bernardino counties, California, and Clark and Nye counties, Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Boechera spatifolia is a sexual diploid that usually has been treated as a variety of Arabis (Boechera) fendleri but appears to be sufficiently distinct to warrant recognition at species level (see M. D. Windham and I. A. Al-Shehbaz 2006 for detailed comparison). There is little geographic overlap between the two, with B. spatifolia confined to the mountains of central Colorado and north-central New Mexico and B. fendleri ranging from western New Mexico and the Four Corners region through northern Arizona to southern Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 380. | FNA vol. 7, p. 408. |
Parent taxa | Brassicaceae > tribe Boechereae > Boechera | Brassicaceae > tribe Boechereae > Boechera |
Sibling taxa | ||
Synonyms | Arabis glaucovalvula | Arabis spatifolia, Arabis fendleri var. spatifolia, B. fendleri subsp. spatifolia, B. fendleri var. spatifolia |
Name authority | (M. E. Jones) Al-Shehbaz: Novon 13: 385. (2003) | (Rydberg) Windham & Al-Shehbaz: Harvard Pap. Bot. 11: 84. (2006) |
Web links |
|