3.
Dimorphocarpa wislizeni
(Engelmann) Rollins, Publ. Bussey Inst. Harvard Univ. 1979: 24. 1979. (as wislizenii).
Dithyrea wislizeni
Engelmann in F. A. Wislizenius, Mem. Tour N. Mexico, 95. 1848;
Biscutella wislizeni
(Engelmann) Bentham & J. D. Hooker ex W. H. Brewer & S. Watson;
D. griffithsii
Wooton & Standley;
D. wislizeni
var.
griffithsii
(Wooton & Standley) Payson
Annuals. Stems
unbranched or branched basally, branched distally, (1-)2-6(-8) dm.
Basal leaves:
petiole 1-4(-5) cm; blade lanceolate to linear-lanceolate, (2-)3-7(-10) cm × 4-15(-20) mm, base cuneate to attenuate, margins pinnately lobed to coarsely dentate.
Cauline leaves:
(proximalmost) petiole 1-4(-5) cm, (distalmost) shortly petiolate or subsessile; blade linear to narrowly lanceolate, base cuneate, margins usually entire, rarely dentate, or repand.
Fruiting pedicels
divaricate to slightly reflexed, (6-)8-14 (-22) mm.
Flowers:
sepals (2.5-)3-4 × 1-1.5 mm, pubescent abaxially; petals white or lavender, 4-7(-8) × (2.5-)3-4(-5) mm, attenuate to claw, claw 1-1.5 mm, expanded basally; filaments white, 2-3.5 mm; anthers 0.7-1 mm.
Fruits:
each valve usually transversely ovoid-oblong, rarely suborbicular, 4-5.5(-6) × (4-)5-7(-7.5) mm (often longer than wide), base slightly rounded, apex truncate, with or without narrow wing beyond indurated part surrounding seeds, glabrous or pubescent; style 0.5-1(-1.2) mm.
Seeds
suborbicular-ovoid, 2-3 × 1.5-2 mm.
2
n
= 18.
Flowering Feb-Oct. Sandy roadsides, sandstone knolls, sand hills and dunes, sandy streambeds and dry washes, desert flats; 1000-2200 m; Ariz., Colo., Nev., N.Mex., Tex., Utah; Mexico (Chihuahua, Coahuila).
