16 CRUCIFERAE. 



A. calycinum L. Plant a, small hoary annual, 3-10 inches high, with 

 linear-spatulate leaves, and pale yellow or whitish flowers; petals slightly 

 exceeding the persistent calyx; pods orbicular, margined, 2-celled, with 2 

 seeds in each cell. Reported as rare from Story county. 



CAMELINA Crantz. Flowers small, yellow. Pods pear-shaped, pointed, 

 flattish parallel to the broad partition; valves l : nerved. Seeds oblong, 

 numerous. 



C. sativa (L.) Crantz. Ftdtte' Flax. Annual; lower leaves lanceolate, 

 petioled, entire or toothed; upper sessile, entire, clasping by a sagittate base; 

 pods large, margined. Waste places, along railways and in flax fields; June- 

 July; infrequent; Winneshiek, Buchanan, Story, and Emmet counties. 



RAPrjANUS L. Radish. Biennials with lyrate-pinnatifid leaves and 

 showy flowers. Pods linear, terete, long pointed, constricted, indehiscent. 

 Seeds in a single series, globose, cushioned. 



R.. sativus L. Stem 2-4' feet high, from a descending fusiform root, 

 branched, covered with scattered spines; leaves petioled, roughly pubescent; 

 flowers white to pinkish. Waste places; June-September; occasionally an 

 escape from cultivation. 



CAPP ARID kCVmLindl. Caper Family. 



Herbs, with alternate compound exstipulate leaves, and cruciform 

 hypogynous flowers. Stamens 6 or more, never tetradynamous. Fruit 

 a 2-valved, 1-celled pod with 2 parietal placentae. Seeds many, reni- 

 form. 



Polanisia. Stamens 8 or more; pod sessile or nearly so, many seeded. 

 (Jleome. Stamens 6: pod long-stipitate. few-seeded. 



POLANIS1A Raf. Strong scented annuals, with glandular viscid hairs, 

 and palmately compound leaves. Flowers in leafy racemes. Sepals 4. 

 spreading, deciduous. Petals 4, with claws, notched at the apex. Stamens 

 8-many, unequal. Pod linear or oblong, veiny, many-seeded. 



P. grciveolens Raf. Stem 4-15 inches-high; leaflets 3, oblong; flowers 

 axillary, solitary, small; calyx and filaments purplish; petals yellowish 

 white, cuneate; stamens about 11, about the length of the petals; styles 

 short; pod 1-3 inches long, slightly stipitate. Sandy shores; May-July; in- 

 frequent; Muscatine and Emmet counties, and reported from a number of 

 other localities. 



P. trachysperma T. & G. Flowers larger; stamens 12-16. long exserted; 

 pod sessile or nearly so. Sandy shores; May-July; common. This and the 

 preceding species have been confused in Iowa herbaria. 



CLEOME L. Ours a glabrous branching herb, with dig-itately 3-foliate 

 leaves and white or rose colored flowers in leafy- bracteate racemes. Sepals 

 and petals 4. Stamens 6. Pod linear or oblong, stipitate, many-seeded. 



C integrifolia T. & G. Stem erect 2-3 feet high, branching; leaflets 

 lanceolate or oblong, entire or serrulate; calyx 4-cleft; racemes elono-ated in 

 fruit; bracts lanceolate or linear; stipe and pedicel about equal. Waste 

 places; July-September; common in western Iowa, infrequent elsewhere- 

 Muscatine, Linn, Woodbury, Monona, Harrison, Pottawattamie, and Fre- 

 mont counties. (C xcrruluta Pursh.) 



Reseda luteoia L. of the order Resedaceae S. F. Gr<nj has been 

 reported from Lee county by Arthur. The species is known as Dyer's Weed 

 or Weld. It has simple entire sessile lanceolate or linear leaves and oreen- 



