Physaria gordonii |
Brassicaceae tribe Physarieae |
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Gordon'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). | Annuals, biennials, perennials, or subshrubs; eglandular. |
Stems | several from base, erect to decumbent or prostrate, (unbranched or branched, sometimes densely leaved), 1–3.5(–4.5) dm. |
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Basal leaves | blade obovate to broadly oblong, 1.5–5(–8) cm, margins lyrate-pinnatifid, dentate, or entire. |
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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. |
petiolate, sessile, or subsessile; blade base usually not auriculate (except Paysonia), margins entire, dentate, or sinuate. |
Racemes | dense. |
ebracteate, often 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). |
actinomorphic; sepals erect, spreading, ascending, or reflexed, lateral pair seldom saccate basally; petals white, yellow, lavender, purple, violet, orange, or brown [pink], claw present, often distinct; filaments unappendaged, not winged; pollen (3 or) 4–11-colpate. |
Fruiting pedicels | (divaricate-ascending, sigmoid or, sometimes, nearly straight), 5–15(–25) mm. |
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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. |
silicles or siliques, dehiscent, unsegmented, terete, latiseptate, or angustiseptate; ovules 2–100 per ovary; style usually distinct; stigma entire or strongly 2-lobed. |
Seeds | flattened. |
biseriate, uniseriate, or aseriate; cotyledons accumbent or incumbent. |
Trichomes | usually short-stalked, subsessile, or sessile, sometimes long-stalked, stellate, scalelike, subdendritic, or forked, sometimes mixed with simple ones. |
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2n | = 12, 32. |
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Physaria gordonii |
Brassicaceae tribe Physarieae |
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Phenology | Flowering Feb–Jul. | |
Habitat | Sandy or light soils, rocky plains, caprock ledges, gravelly brushland, sandy desert washes, stream bottoms, pastures, roadsides, abandoned fields | |
Elevation | 150-1700 m (500-5600 ft) | |
Distribution |
AZ; KS; NM; OK; TX; VA; Mexico (Chihuahua, Sonora)
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North America; Mexico; South America; Asia (ne Russia) |
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.) |
Genera 7, species ca. 130 (7 genera, 105 species in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 640. | FNA vol. 7, p. 604. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae |
Sibling taxa | ||
Subordinate 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) | B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 100. (1895) |
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