Physaria parviflora |
Physaria arizonica |
|
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frosty bladderpod, Piceance bladderpod, Picenace bladderpod |
Arizona bladderpod |
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Habit | Perennials; caudex simple or branched; densely (silvery) pubescent, trichomes (irregularly radiate), 6–8-rayed, rays furcate or bifurcate, fused at base. | Perennials; caudex branched, (cespitose); densely (silvery gray) pubescent, trichomes (sessile or subsessile), (4-), 6-, or 8-rayed, rays fused at base, furcate or bifurcate, (slightly umbonate, tuberculate throughout). |
Stems | several from base, prostrate to decumbent, (usually unbranched, rarely branched distally), 1–3 dm. |
simple or few to several from base, erect, (unbranched, slender), 0.2–1(–1.5) dm. |
Basal leaves | (tufted); blade broadly obovate, 1–2 cm, margins entire or with 1 or 2 broad teeth, (apex rounded to obtuse). |
(densely tufted, not rosulate, reflexed in age); blade obovate to oblanceolate, 0.7–2(–3) cm, margins usually entire, sometimes repand or shallowly dentate, (apex acute). |
Cauline leaves | blade oblanceolate to nearly oblong, similar to basal, (base cuneate), margins entire. |
similar to basal, becoming narrower distally, somewhat reflexed, (distal) blade linear or narrowly oblanceolate, 0.5–2.5(–5.5) cm. |
Racemes | (secund), loose, (elongated in fruit). |
dense, often subcorymbiform. |
Flowers | sepals (yellowish), elliptic to lanceolate, (2–)3–4 mm; petals spatulate, (3.9–)5–7 mm. |
sepals (green or greenish yellow), ovate or broadly ovate, 3.5–6.5 mm, (lateral pair subsaccate, cucullate, median pair thickened, slightly cucullate apically); petals (spreading), oblanceolate to obovate, 5.5–8(–10) mm, (claw erect). |
Fruiting pedicels | (recurved), 6–8(–12) mm. |
(erect or divaricate-spreading, straight or slightly curved), (3–)5–10(–15) mm. |
Fruits | (usually pendent), elliptic to subglobose, usually slightly compressed (latiseptate), 3–4 mm; valves densely pubescent, sometimes with scattered trichomes inside; ovules 4 per ovary; style ca. 3 mm. |
(sessile or substipitate), suborbicular to ovoid or ellipsoid, slightly inflated, 4–7 mm; valves pubescent outside, trichomes substipitate, spreading, sometimes sparsely pubescent inside, trichomes sessile, smooth; ovules 4–10(–16) per ovary; style (0.5–)1–2(–4) mm (shorter than fruit). |
Seeds | somewhat flattened. |
flattened. |
2n | = 10. |
|
Physaria parviflora |
Physaria arizonica |
|
Phenology | Flowering Jun–Jul. | Flowering Apr–Jun. |
Habitat | Shale of steep slopes, rock crevices, ledges, canyon sides, shale-marlstone | Sandy and gravelly soils, limey knolls or limestone chip, often in open stands of sagebrush-pinyon, pinyon-juniper, Gambel oak and sometimes ponderosa pine |
Elevation | 2100-2700 m (6900-8900 ft) | 1000-2200 m (3300-7200 ft) |
Distribution |
CO
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AZ; UT
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Discussion | Of conservation concern. Physaria parviflora is known from the Parachute Creek Member of the Green River Formation, Rio Blanco County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The circumscription of Physaria arizonica here is quite broad and includes plants that have densely tufted basal leaves and relatively few or no cauline leaves; plants that are loosely tufted and have several cauline leaves; and plants that have a strongly branched caudex, leafy stems, and sterile shoots (var. andrusensis). Additional study is needed to understand the pattern of variation in this complex species; all of the characters given above vary considerably. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 657. | FNA vol. 7, p. 627. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae > tribe Physarieae > Physaria |
Sibling taxa | ||
Synonyms | Lesquerella parviflora | Lesquerella arizonica, Lesquerella arizonica var. nudicaulis, P. arizonica var. andrusensis |
Name authority | (Rollins) O’Kane & Al-Shehbaz: Novon 12: 326. (2002) | (S. Watson) O’Kane & Al-Shehbaz: Novon 12: 321. (2002) |
Web links |