OF THE WASATCH REGION 29 



1. F. officinalis L. Stems %-3 ft. high, often climbing or de- 

 cumbent. Flowers purplish, darker at apex. In waste places, 

 often along railroad tracks. June-August. 



CRUCIFER^. Mustard Family. 



Herbs with a pungent watery juice, alternate ex- 

 stipulate leaves and inflorescence in terminal racemes 

 or corymbs. Pedicels without bracts. Flowers with 

 4 deciduous sepals, 4 cruciform petals (or wanting in 

 some species of Draba and Lepidium), 6 tetradynamous 

 stamens (or 2-4 in some species of Lepidium or in 3 

 sets of 2 each in some species of Streptanthus) and 1 

 pistil with a 2- or rarely 1-celled "superior" ovary. 

 Fruit a silique or a silicle. Mature fruit is necessary 

 for the determination of the species. 



Fruit compressed or flattened at right angles to the 



(narrow) partition. 

 Fruit ovate-cordate to round in outline, each cell 



1 -seeded 1. Lepidium 



Fruit broadly wedge-shaped or elliptic-oblong; each 



cell several-seeded 2. Cnpsella 



Fruit compressed or flattened parallel to the (broad) 



partition. 

 Fruit globose, 2-8-seeded; filaments dilated near 



base 3. Alyssum 



Fruit linear, oblong or ovate (rarely globose) ; 

 many-seeded; filaments not dilated. 



Fruit a silicle 4. Draba 



Fruit a silique. 



Valves of silique 1-nerved. 



Fruit linear; anthers short, scarcely 



emarginate at base 5. Arabis 



Fruit strap -shaped; anthers long, sagit- 

 tate at base 6. Streptanthus 



Valves of silique nerveless 7. Cardamine 



Fruit neither compressed nor flattened. 

 Fruit a silicle. 



Silicle didymous, its cells bladdery-inflated 8. Physarla 

 Silicle not didymous. 



Silicle many-seeded; pubescence not ste- 



late 9. Camclina 



Silicle 2-8-seeded; pubescence stellate.. 3. Alyssmn 

 Fruit a silique. 



Fruit not distinctly beaked. 

 Fruit terete or nearly so. 



Seeds in 2 rows in each cell. 



Valves of fruit nerveless 10. Radieula 



Valves of fruit 1-nerved... 11. Sisymbrlum 

 Seeds in 1 row in each cell. 



