486 BRASSICACEAE 



1. Strsptanthus bracte^tus A. Gray. Foliage glabrous. Stems 3-9 dm. tall, 

 simple, or branching above : basal and lower stem-leaves with short petioles and blades 

 varying from entire to lyrate-pinnatifid ; upper stem leaves ovate or oblong, 2-10 cm. 

 long, entire, clasping : pedicels ascending, 5-10 mm. long, the scales ovate, cordate : sepals 

 oblong-ovate, about 8 mm. long : pods 10-15 cm. long, 4 mm. broad, spreading, tipped with 

 the broad stigma : seeds oblong, broadly winged. 



In dry soil, southwestern Texas. Spring. 



2. Streptanthus maculatus Nutt. Foliage glabrous, glaucous. Stems 2-6 dm. 

 tall, often simple : leaves various, the cauline with oblong, elliptic or ovate entire blades, 

 sessile, deeply cordate and clasping : pedicels 4-9 mm. long, naked : sepals purplish : pods 

 slender, 10-15 cm. long, straight or curved, erect or ascending, beaked : seeds oblong, 

 winged. 



On plains and prairies, Arkansas and Texas. Spring. 



3. Streptanthus platycirpus A. Gray. Foliage glabrous. Stems 2-6 dm. tall, 

 branching from near the base : basal and lower stem-leaves lyrate-pinnatifid ; upper stem- 

 leaves lanceolate to ovate-oblong, 2-8 cm. long, entire, or pinnatifid, sessile, clasping : 

 pedicels stout, ascending, finally about 1 cm. long, often with minute scales : sepals 

 purplish, oblong-lanceolate, 8-10 mm. long : pods linear, ascending, 5-8 cm. long, 4-5 

 mm. broad : seeds winged, suborbicnlar. 



In valleys, Texas to Sonera. Spring. 



26. EUKLISIA Rydb. 



Annual or biennial mainly glabrous herbs. Leaves alternate, sometimes mostly basal : 

 blades various, entire, toothed or pinnatifid, those of the cauline sometimes clasping at the 

 base. Flowers perfect, in terminal racemes. Calyx campanulate. Sepals mainly purple, 

 with somewhat thickened spreading tips, the outer pair at least, strongly saccate at the base. 

 Petals white or purple, the blade scarcely wider than the claw. Stamens 6 : filaments 

 slender: anthers sagittate. Ovaiy sessile. Ovules several. Pods narrow. Seeds flattened, 

 mostly winged. Cotyledons accumbent. 



1. Euklisia hyacinthoides (Hook.) Small. Foliage glabrous. Stems 3-12 dm. tall, 

 simple or sparingly branched : leaves several ; blades linear to linear-lanceolate, 3-15 cm. 

 long, acute, entire, or slightly toothed, half-clasping : pedicels ascending, 3-5 mm. long : 

 sepals linear, about 8 mm. long, acute, saccate: pods 2.5-10 cm. long, 2 mm. wide, ascend- 

 ing, beaked : seeds oblong, winged. l^Strepianthus hyacmthoidcs Hook.] 



On plains or prairies, the Indian Territory and Texas. Spring. 



27. SELENIA Nutt. 

 Low annual caulescent herbs, with glabrous foliage. Stems often branching at the 

 base. Leaves alternate : blades pinnatisect, the segments entire or toothed. Flowers 

 perfect, in loose racemes. Sepals 4, spreading, equal or nearly so, somewhat sulcate at 

 the base. Corolla yellow, tlie four petals erect, narrowed into claws. Stamens 6, accom- 

 panied by 10 hypogynous glands. Ovary sessile or nearly so : style slender : stigma capi- 

 tate. Ovules several. Pods flat, oblong, or elliptic, abruptly narrowed at each end, stipi- 

 tate, the thin valves with a nerve. Seeds in two rows in each cavity, orbicular, mar- 

 gined or broadly winged. Cotyledons accumbent. 



Pedicels erect or ascending : capsules oblong, the style-beak about 4 mm. long. 1. S. aurea. 



Pedicels spreading : capsules elliptic, the style-beak 8-12 mm. long. 2. S. aperta. 



1. Selenia aurea Nutt. Foliage bright green. Stems with erect or ascending 

 branches 5-20 cm. long: leaves conspicuous; blades narrow, 2.5-7 cm. long, pinnati- 

 sect, the segments entire or with 1 or 2 coarse teeth : racemes several-flowered : bracts simi- 

 lar to the leaves but smaller : pedicels erect or ascending, 1-2.5 cm. long : sepals narrow, 

 unappendaged : petals yellow, about twice as long as the se])als : pods ohlong, 12-20 mm. 

 long, 4—6 mm. wide, each tipped with a very slender style-beak about 4 mm. long. 



On wet plains and prairies, Missouri to Kansas and Texas. Spring. 



2. Selenia aperta (S. Wats. ) Small. Similar to *S'. aurea in habit. Racemes with 

 divaricate pedicels at maturity: pods elliptic, usually broadly so, 12-16 mm. long, the 

 slender style-beak 8-12 mm. long. [S. aurea var. aperta S. Wats.] 



On plains or prairies, Texas. Spring. 



