desert pepperweed, more...
Perennials or subshrubs;
(woody base aboveground); (glaucous), glabrous throughout. Stems
several from base, erect or ascending, branched (several) distally, 2-5.5(-10) dm. Basal leaves
absent. Cauline leaves
sessile; blade linear and undivided or pinnately lobed (lobes 3-7(-9), linear), (1.5-)2.2-8.4(-10.2) cm × (0.7-)1-2.8(-4.2) mm, base attenuate, not auriculate, margins entire, (similar, smaller distally). Racemes
(panicles), elongated in fruit. Fruiting pedicels
divaricate-ascending to horizontal, usually straight, rarely slightly curved, (terete), (3.5-)4.3-7.6 (-8.5) × 0.15-0.2 mm. Flowers:
sepals obovate, 1.5-2.5 (-3) × 1-1.6 mm; petals white, spatulate, 2.5-4.2 × 1.5-2.2 mm, claw 1-2 mm; stamens 6; filaments 1.8-3 mm; anthers 0.4-0.7 mm. Fruits
obovate to orbicular, (4-)4.5-7(-8) × 4.2-7(-8) mm, apically winged, apical notch (0.1-)0.2-0.5 mm deep; valves thin, smooth, not veined; style 0.2-0.8(-1) mm, exserted beyond apical notch. Seeds
ovate, 1.6-2.1 × 0.9-1.1 mm. 2n
= 32. Flowering Mar-Jun. Desert shrub communities, pinyon-juniper woodlands, sandy washes, gravelly deserts, barren knolls, bluffs, roadsides, steep limestone outcrops, rocky ledges and slopes; 400-2100 m; Ariz., Calif., Nev., Utah. Rollins established var. stipitatum
on the basis of fruits obovate with gynophores 0.5-0.75 mm versus (var. fremontii
) fruits orbicular to ovate and sessile. These two characters often do not covary and stipitate fruits occur sporadically throughout the species range, including Arizona (Lemmon s.n.
, GH), California (Morefield 3427
, GH), and Nevada (Comanor 18,
GH; Hitchcock 3078
Plant: Perennial, generally shrubby, 4-10 dm, glabrous, gray; stem many-branched Leaves: basal and cauline; 3-10 cm, linear, generally pinnately lobed; lobes 3-9, 1-3 mm wide; upper 2-3 mm wide, entire or not; cauline short-petioled to sessile, sometimes clasping or surrounding stem INFLORESCENCE: raceme, many-branched, ± leafy Flowers: small, bisexual; sepals 4, free; petals ± 3 mm, obovate to spoon-shaped, white, claw slender; stamens generally (2,4)6, generally 4 long, 2 short; ovary 1, superior, chambers generally 2, septum membranous, connecting 2 parietal placentas, style 1, stigma simple or 2-lobed Fruit: capsule with 2 thin deciduous valves, 5-8 mm; veins faint, dehiscent, oblong to elliptic or obcordate, flat perpendicular to septum; Seeds 1 per chamber, gelatinous when wetted; wing narrow or 0; embryonic root at back of 1 cotyledon, rarely at edges of both Misc: Sandy washes, barren knolls, gravelly soils, rocky slopes, ridges; < 1600 m.