Physaria gordonii |
Physaria fremontii |
|
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Gordon's bladderpod |
Fremont's bladderpod |
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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 simple; densely pubescent, trichomes (subsessile), 5–7-rayed, rays distinct or slightly fused at base, usually furcate, (roughly tuberculate). |
Stems | several from base, erect to decumbent or prostrate, (unbranched or branched, sometimes densely leaved), 1–3.5(–4.5) dm. |
few to several from base, prostrate, (arising proximal to a terminal cluster of erect leaves, usually unbranched, slender), 0.5–1(–1.5) dm. |
Basal leaves | blade obovate to broadly oblong, 1.5–5(–8) cm, margins lyrate-pinnatifid, dentate, or entire. |
(petiole slender); blade elliptic to rhombic, 1.5–4(–5) cm, (base gradually tapering to petiole), margins usually entire, rarely dentate. |
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. |
blade narrowly obovate to oblanceolate, 5–15 mm, margins entire. |
Racemes | dense. |
(relatively short), rather loose. |
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 ± elliptic, 4–6 mm; petals ovate, 6–8 mm, (claw slightly expanded at base). |
Fruiting pedicels | (divaricate-ascending, sigmoid or, sometimes, nearly straight), 5–15(–25) mm. |
(usually secund, recurved), 5–8 mm. |
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. |
(pendent), globose, subglobose, or slightly obcompressed, slightly or not inflated, 3–6 mm, (rigid, apex usually beaked); valves pubescent throughout; ovules 8–12 per ovary; style 1–2 mm, (pubescent). |
Seeds | flattened. |
slightly flattened, (suborbicular). |
2n | = 12, 32. |
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Physaria gordonii |
Physaria fremontii |
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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 | Calcareous gravel, loose whitish rubble, limestone pavement, rocky calcareous ridges |
Elevation | 150-1700 m (500-5600 ft) | 2100-2800 m (6900-9200 ft) |
Distribution |
AZ; KS; NM; OK; TX; VA; Mexico (Chihuahua, Sonora)
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WY |
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 fremontii is known from the area of the Wind River Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 640. | FNA vol. 7, p. 638. |
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 | Lesquerella fremontii |
Name authority | (A. Gray) O’Kane & Al-Shehbaz: Novon 12: 323. (2002) | (Rollins & E. A. Shaw) O’Kane & Al-Shehbaz: Novon 12: 323. (2002) |
Web links |