Flora of North America species comparison

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Physaria argyraea subsp. argyraea
Photo is of parent taxon
Habit Perennials; caudex simple or branched, (woody); ± densely pubescent, trichomes (sessile or short-stalked), few- to several-rayed, rays fused at base, (smooth or finely tuberculate).
Stems

simple or several from base, prostrate and spreading to decumbent or erect, 0.5–4(–7) dm.
Basal leaves

(usually shed early);

blade oblanceolate, 2–6(–8) cm, margins entire or pinnatifid.
Cauline leaves

(densely overlapping, often appressed, erect; petiolate);

blade elliptic or obovate to rhombic, 0.5–4.5 cm, margins entire or sinuate or remotely dentate, (apex usually acute).
Racemes

loose.
Flowers

sepals linear to oblong or elliptic, (3–)4–8 mm, (median pair thickened apically, cucullate);

petals (orange or yellow, rarely fading purplish, claw often orange), spatulate or obovate to obdeltate, (narrowing to relatively short claw), 4.5–8.5(–11) mm.
Fruiting pedicels

(spreading to erect or occasionally slightly recurved, sigmoid, straight, or slightly curved), 15–40 mm.
Fruits

subglobose to broadly ellipsoid, slightly compressed (or terete), 4–8 mm;

valves (not retaining seeds after dehiscence), glabrous throughout;

replum as wide as or wider than fruit;

ovules 16–32 per ovary;

style 1.5–5.5 mm.
Seeds

flattened, (sometimes narrowly margined).

Physaria argyraea subsp. argyraea
Phenology Flowering Feb–May(-Jun).
Habitat Sandy granite- or, usually, limestone-derived soils
Elevation 0-800 m (0-2600 ft)
Distribution
from FNA
TX; n Mexico (Coahuila, Nuevo León)
Discussion

Subspecies argyraea differs from subsp. diffusa (Rollins) O’Kane & Al-Shehbaz of the Sierra Madre Oriental of Mexico in being herbaceous (rather than at least somewhat woody throughout) and having decumbent to erect (rather than prostrate) stems.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 627.
Parent taxa Brassicaceae > tribe Physarieae > Physaria > Physaria argyraea
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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