Boechera glaucovalvula |
Boechera consanguinea |
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bluepod rockcress |
Four Corners rockcress |
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Habit | Perennials; short- to long-lived; sexual; caudex usually not woody. | Biennials or perennials; short-lived; apomictic; caudex present or absent. |
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. |
usually 1 per caudex branch, arising from center of rosette near ground surface, 1.5–5 dm, densely pubescent proximally, trichomes short-stalked, 2–6-rayed, 0.2–0.5 mm, glabrous or sparsely pubescent distally. |
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 oblanceolate, 2–10 mm wide, margins usually dentate, sometimes ciliate near petiole base, trichomes (usually spurred), to 0.7 mm, surfaces moderately to densely pubescent, trichomes short-stalked, 4–8-rayed, 0.1–0.4 mm. |
Cauline leaves | 6–10, not concealing stem; blade auricles absent, surfaces of distalmost leaves densely pubescent. |
15–36, sometimes concealing stem proximally; blade auricles 1–3 mm, surfaces of distalmost leaves sparsely pubescent. |
Racemes | (5–)10–25-flowered, usually unbranched. |
20–55-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-descending at anthesis; sepals pubescent; petals pale lavender, 5–8.5 × 1–2 mm, glabrous; pollen spheroid. |
Fruiting pedicels | reflexed, strongly curved at base, 2–10 mm, pubescent, trichomes appressed, branched. |
reflexed to divaricate-descending, usually curved downward, 8–14 mm, usually pubescent, rarely glabrous, trichomes subappressed, branched. |
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. |
reflexed to pendent, rarely appressed to rachis, not secund, straight or slightly curved, edges parallel, 4–6 cm × 1–2 mm; valves glabrous; ovules 100–128 per ovary; style 0.05–0.5 mm. |
Seeds | biseriate, 5–6 × 4–5 mm; wing continuous, 1.8–2.5 mm wide. |
biseriate to sub-biseriate, mature seeds not seen. |
2n | = 14. |
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Boechera glaucovalvula |
Boechera consanguinea |
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Phenology | Flowering Mar–Apr. | Flowering May. |
Habitat | Rocky slopes and gravelly soil, usually under shelter of desert shrubs | Rocky slopes and sandy soil in ponderosa pine, pinyon-juniper, and sagebrush communities |
Elevation | 600-1600 m (2000-5200 ft) | 1900-2500 m (6200-8200 ft) |
Distribution |
CA; NV
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CO; NM; UT
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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.) |
Morphological evidence suggests that Boechera consanguinea is an apomictic species that arose through hybridization between B. fendleri and B. retrofracta. It is most similar to B. goodrichii, another apomictic hybrid involving B. retrofracta (see M. D. Windham and I. A. Al-Shehbaz 2007 for detailed comparison). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 380. | FNA vol. 7, p. 371. |
Parent taxa | Brassicaceae > tribe Boechereae > Boechera | Brassicaceae > tribe Boechereae > Boechera |
Sibling taxa | ||
Synonyms | Arabis glaucovalvula | Arabis consanguinea, Arabis holboellii var. consanguinea |
Name authority | (M. E. Jones) Al-Shehbaz: Novon 13: 385. (2003) | (Greene) Windham & Al-Shehbaz: Harvard Pap. Bot. 11: 261. (2007) |
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