BRASSICACEAE 471 



petals yellow, spatulate, about twice as long as the sepals : cavities of the ovary with 4-6 

 ovules: pods subglobose, 2-2.5 mm. in diameter, stipitate, glabrous. 

 On prairies, Nebraska to Texas. Spring. 



14. Lesquerella sessilis (S. Wats.) Small. Quite similar to L. gracilis, but usually 

 larger and with more densely pubescent foliage. Leaves erect or ascending ; blades un- 

 dulate or repand, more or less silvery or lustrous beneath : pods globular, 2.5-3 mm. in 

 diameter, sessile. [L. gracilis var. sessilis S. Wats.] 



On plains or prairies, Texks Summer. 



15. Lesquerella polyantha Schlecht. Annual, more or less densely stellate-pubes- 

 cent. Stems branched at the base ; branches ascending or spreading, 1-4 dm. long, simple 

 or branched : basal leaves 1.5-5 cm. long, with lanceolate or oblanceolate lyrate blades and 

 short petioles : stem-leaves with oblanceolate or oblong, or linear or rarely spatulate, obtuse 

 or acutish, entire or undulate blades : pedicels finally spreading or recurving, 8-20 mm. 

 long: sepals oblong, 2.5-3.5 mm. long: petals yellow, spatulate, about twice as long as 

 the sepals : cavities of the ovary with 6-8 ovules : pods subglobose, 4-5 mm. in diameter, 

 stipitate, glabrous. 



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



16. Lesquerella angustifolia (Nutt. ) S. Wats. Annual, finely scaly-pubescent. 

 Stems simple or branched, 2-3 dm. long, slender : leaves various ; basal witli lyrate-pin- 

 natifid blades 1.5-4.5 cm. long: stem-leaves shorter, narrowly linear, racemes few-several- 

 flowered : pedicels slender, ascending or spreading or almost wanting : sepals 3.5-4 mm. 

 long : petals yellow, spatulate, 5 mm. long : cavities of the ovary with 2 ovules : pods sub- 

 globose, 4-5 mm. in diameter, glabrous, the style shorter than the body. 



On prairies, near the Red River, Arkansas. Spring. 



17. Lesquerella Engelmdnnii (A. Gray) S. Wats. Biennial or perennial, densely 

 pubescent with stellate hairs. Stems branched at the base ; branches erect or ascending, 

 2-4 dm. tall, simple or branched : basal leaves 2-6 cm. long ; blades linear-spatulate or 

 narrowly oblanceolate, obtuse ; petioles sometimes as long as tlie blades : pedicels spread- 

 ing or ascending, fully 1 cm. long at maturity : sepals about 6 mm. long : petals yellow, 

 broadly spatulate, 6-12 mm. long : cavities of the ovary with 6-8 ovules : pods almost 6 

 mm. long, barely stijiitate, the style as long as tlie body or longer. 



In dry soil, Kansas to Colorado and Texas. Spring. 



18. Lesquerella argyrfea (A. Gray) S. Wats. Biennial or perennial, more or less 

 densely stellate-pubescent. Stems usually much branched at the base ; branches decum- 

 bent or prostrate, 1-4 dm. long : basal leaves 1.5-3 cm. long; blades elliptic, or linear- 

 elliptic, entire or repand ; petioles shorter than the blades : stem-leaves similar to the 

 basal but with shorter petioles or oblanceolate : pedicels finally spreading, ,8-12 mm. long, 

 more or less curved : sepals linear-oblong, 3-4 mm. long: petals yellow, turning purple, 

 nearly twice as long as the sepals : cavities of the ovary with 6-10 ovules : pods sub- 

 globose, 3 mm. broad, not stalked, the style as long as the body or shorter. 



In dry soil, Texas, between the Colorado River and the Rio Grande. Also in adjacent Mexico. 

 Spring. 



6. CAMELINA Crantz. 



Annual caulescent herbs, with glabrous foliage, or pubescent with branching hairs. 

 Stems erect, terete. Leaves alternate : blades entire or toothed, often clasping, the lower 

 ones sometimes pinnatifid. Flowers perfect, in elongated racemes. Sepals 4, equal. 

 Corolla yellowish or greenish, the 4 petals longer than the sepals. Stamens 6. Ovary 

 sessile : style slender : stigma capitate. Ovules few or numerous. Silicles short, inflated, 

 nearly terete or flattened, the valves 1-nerved. Seeds in 2 rows in each cavity, marginless. 

 Cotyledons incumbent. False Flax. 



Plant pubescent : silicles 4-6 mm. long. 1. C. microcarpa. 



Plant glabrous or nearly so : silicles 6-8 mm. long. 2. C. saliva. 



1. Camelina microcarpa Andrz. Foliage pubescent, at least below. Stems erect, 

 simple or with a few elongated branches : leaves few ; blades lanceolate, 1.5-7 cm. long, ses- 

 sile, auricled or the lower ones narrowed at the base, acute or acuminate : pedicels slender, 

 spreading : racemes elongating, often 2-3 dm. long : silicles slightly flattened, 4-6 mm. 

 long, broader above the middle, strongly margined. 



In fields and waste places, Rhode Island to Idaho and British Columbia, West Virginia, Tennessee 

 and Kansas. Spring. 



