Physaria gordonii |
Physaria obcordata |
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Gordon's bladderpod |
Dudley bluffs twinpod, Piceance twinpod |
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Habit | Annuals, biennials, or perennials; (short-lived); with a fine taproot; usually densely pubescent, trichomes (sessile or short-stalked), 4–7-rayed, rays distinct and furcate or bifurcate, (nearly smooth to finely tuberculate). | Perennials; caudex branched, (thick, covered with persistent, overlapping leaf bases); densely (silvery) pubescent, trichomes (stellate-scalelike), several-rayed, rays fused (webbed) to tips. |
Stems | several from base, erect to decumbent or prostrate, (unbranched or branched, sometimes densely leaved), 1–3.5(–4.5) dm. |
several from base, erect to decumbent, (unbranched, fertile stems from among basal leaves), 1.2–1.8 dm. |
Basal leaves | blade obovate to broadly oblong, 1.5–5(–8) cm, margins lyrate-pinnatifid, dentate, or entire. |
(erect, not rosulate); blade broadly oblanceolate, 4–8 cm, margins entire or shallowly sinuate-dentate, (apex acute). |
Cauline leaves | (proximal sometimes petiolate, distal sessile); blade linear to oblanceolate, often falcate, 1–4(–7) cm, (proximal with base sometimes cuneate), margins entire, repand, or shallowly dentate. |
(proximal petiolate); blade narrowly lanceolate, similar to basal in size, (distal with cuneate base), margins entire. |
Racemes | dense. |
loose, (elongated in fruit). |
Flowers | sepals elliptic or oblong, 3–6.5 mm, (lateral pair subsaccate, median pair thickened apically, cucullate); petals (widely spreading at anthesis, yellow to orange, claw sometimes whitish), cuneate, obdeltate, or obovate, (tapering to claw), 5–8(–10) mm, (claw often widened at base). |
sepals (greenish yellow), elliptic, often broadly so, 4.8–7.1 mm; petals oblanceolate, 6.8–9.8 mm. |
Fruiting pedicels | (divaricate-ascending, sigmoid or, sometimes, nearly straight), 5–15(–25) mm. |
(widely spreading to recurved), 1–1.5 cm. |
Fruits | (shortly stipitate), subglobose, not or slightly compressed, (3–)4–8 mm; valves (not retaining seeds after dehiscence), glabrous throughout; replum as wide as or wider than fruit; ovules (8–)12–20(–26) per ovary; style (1.5–)2–4(–5) mm. |
(usually pendent), slightly didymous apically, obcordate, slightly inflated, 4–7 × 3–6 mm, (papery, basal sinus absent, apical sinus evident to nearly absent); valves (retaining seeds after dehiscence), pubescent; replum broadly obovate to suborbicular, 4–5 mm, as wide as or wider than fruit, margins entire; ovules usually 4 (rarely 6–8) per ovary; style (2.5–)3–4(–5) mm. |
Seeds | flattened. |
plump. |
2n | = 12, 32. |
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Physaria gordonii |
Physaria obcordata |
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Phenology | Flowering Feb–Jul. | Flowering May–Jun. |
Habitat | Sandy or light soils, rocky plains, caprock ledges, gravelly brushland, sandy desert washes, stream bottoms, pastures, roadsides, abandoned fields | Steep slopes, fine chiprock, shaley hillsides |
Elevation | 150-1700 m (500-5600 ft) | 1800-2300 m (5900-7500 ft) |
Distribution |
AZ; KS; NM; OK; TX; VA; Mexico (Chihuahua, Sonora)
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CO
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Discussion | Physaria gordonii was reported from Virginia in 1987 by Robert Wright from a Hampton Shale roadcut along the Blue Ridge Parkway, where it was probably a short-lived waif. Subspecies densifolia, of Lincoln County, New Mexico, of which there is now more material than Rollins had available in 1993, appears to represent a suite of environmentally determined, variable, and intergrading characteristics that does not merit taxonomic recognition. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Physaria obcordata is known from the Thirteenmile Creek Tongue and the Parachute Creek Member of the Green River Formation. It is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 640. | FNA vol. 7, p. 653. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae > tribe Physarieae > Physaria |
Sibling taxa | ||
Synonyms | Vesicaria gordonii, Alyssum gordonii, Lesquerella gordonii, Lesquerella gordonii var. densifolia, P. gordonii subsp. densifolia, P. gordonii var. densifolia | |
Name authority | (A. Gray) O’Kane & Al-Shehbaz: Novon 12: 323. (2002) | Rollins: J. Arnold Arbor. 64: 495, fig. 1. (1983) |
Web links |