Spring Flora of Oklahoma 
57 
rarely toothed. Flowers orange-yellow. Pods linear, rough, 1%'-4' 
long. Seeds orbicular, wing margined. 
In open places. May-July. Wichita and Arbuclde Mountains. 
XI. NORTA Adans. 
Biennial herbs, with alternate, pinnatifid or dentate 
leaves and medium-sized yellow flowers. Pubescence when 
present, of simple hairs. Seeds spreading. Pods narrowly 
linear, much elongated, terete. Stigma 2slobed. Seeds 
in 1 or 2 rows in each cell. 
1. Norta altissima (L) Britton. Tall Sisymbrium. Erect, 
freely branching, glabrous or nearly so. Lowest leaves runcinate- 
pinnatifid, petioled, the lobes lanceolate, often auriculate. Upper 
leaves smaller, very deeply pinnatifid, the lobes linear or lanceolate, 
dentate or entire, often with a narrow projection on the lower side 
near the base. Flowers yellowish. Pods very narrowly linear, stiff, 
divergent, 2'-4' long. Valves with a prominent midrib. 
In waste places. May-August. Oklahoma County. 
XII. CONRINGIA (Heist.) Adans. 
Erect, glabrous, annual herbs, with elliptic or ovate en¬ 
tire leaves, sessile and cordate, or the lower narrowed at 
the base, and medium-sized, yellowish flowers in terminal 
racemes. Sepals and petals narrow. Style 2-lobed or en 
tire. Pods elongated-linear, 4-angled. Seeds in 1 row in 
each cell. Cotyledons incumbent. 
1. Oonringia orilemtalis (L) Dumort. Hare’s Ear Mustard. 
Stem usually erect, simple, or somewhat branched. Leaves light 
green, obtuse at the apex, the upper smaller. Pedicels slender, as¬ 
cending, 4"-8" long. Pods 3'-5' long, about V wide, 4-angled, spread¬ 
ing. 
In waste places. May-August. Oklahoma County. 
XIII. ARABIS L. 
Annual or perennial herbs, smooth, or with forked or 
stellate hairs. Basal leaves spatulate, stem leaves sessile. 
Flowers usually white. Petals entire, usually with claws. 
Pods linear, flattened. 
1. Arabis virginica (L.) Trelease. Virginia Rock-cress. An¬ 
nual or biennial, diffuse, glabrate, the stems ascending. Leaves ob- 
