MUSTARD FAMILY 101 



Plant usually less thaa 3 dm. high; inflorescence at least in fruit elongate, 

 racemose. 20. L. stenophylla. 



Bisal leaf-blades broadly oval. 21. L. ovalifolia. 



11. SUBULARIA L. l. S. aquatica. 



12. CAMELINA Crantz. False Flax. 



stem glabrous. 1. C. sativa. 



Stem pubescent. 2. C. microcarpa. 



13. NESLIA Desv. l. N. paniculata. 



14. ARMORACIA Gaertn. Horse-radish. l. A. Arni'^racia. 



15. RADICULA Hill. Yellow Water-cress, Marsh-cress. 

 Perennials with rootstocks; petals much exceeding the sepals. 



Pods papillose. 



Pods ovate; leaves coarsely toothed. 1. B. calycina. 



Pods lance-oblong or linear, mostly curved; leaves pinnatifld. 



Leaves tliin; petals wliite; fruit recurved. 2. R. trachycarpa. 



Leaves tliick; petals yellow; fruit erect. 3. R. Columbiae. 



Pods not papillose. 4. R. sinuata. 



Annuals or biennials. 



Pods thickened towards the apex and truncate, curved, longer than the pedicels. 



5. R. clavata. 

 Pods not thickened towards the apex, acute or obtuse. 



Pods spherical to oblong-eUipsoid, in the latter case shorter than the pedicels. 

 Pedicels 4-10 mm. long. 



Pods 5-8 mm. long, 2-3 mm. thick; stem sparingly hirsute. 



6. R. pacifica. 

 Pods 3-5 mm. long (rarely 6-7 mm. in R. palustris), 1.5-2 mm. thick. 



Stem more or less hirsute. 7. R. hispida. 



Stem glabrous. 



Stem tall, 3-8 dm. high; stigma prominent, 2-lobed. 



8. R. terrestris. 

 Stem low, divaricately branched, 1-3 dm. high; stigma scarcely 

 tliicker than the style. 9. R. alpina. 



Pedicels 2-5 mm. long, pod globose. 10. R. sphaerocarpa. 



Pods oblong to linear-cylindrical, equalling or longer than the short pedicels. 

 Style about 1 mm. long. 



Leaves nearly ail pinnatifld, with obtuse divisions. 11. R. obtusa. 

 Leaves mostly sinuate, or if pinnatifld, with acute divisions. 



Pods short-ellipsoid, straight on straight pedicels. 10. R. sphaerocarpa. 

 Pods elongate-ovoid, curved, on curved pedicels. 12. jB. curvipes. 

 Style minute, 0.5 mm. long or less. 



Pods 1.5 mm. thick or less, distinctly pedicelled; seeds tuberculate. 



Petals about 2 mm. long or more; pod.^ linear, 1 mm. or less thick, 

 strongly curved. 

 Leaves divided to near the midrib, their segments obtuse. 



13. R. curvisiliqua. 

 Leaves merely cleft, with acute segments. 14. R. Nuttallii. 



Petals rarely more than 1 mm. long; pods usually slightly tapering 

 upwards, about 1.5 mm. thick, straight or slightly curved. 

 Leaves pinnatifld. 



Low, slender, less than 2 dm. high ; leaves not auricled at the base. 



15. R. lyrata. 

 Taller and stouter, over 2 dm. high; petioles of the stem-leaves 

 auricled at the base. 16. R. UnderiLoodii. 



Leaves entire or merely sinuate. 17. R. integra. 



Pods fuUj- 2 mm. tliick, almost sessile; seeds pitted. IS. R. sessiliflora. 



16. SISYMBRIUM (Tourn.) L. Water-cress. l. 5. Nasturtium-aquaticum. 



17. TURRITIS L. Tower Mustard. l. r. glabra. 



18. ERYSIMUM L. Hedge Mustard. l. E. officinale. 



19. NORTA Aclans. Tumble Mustard. l. N. altissima. 



20. BRAYA Sternb. & Hoppe. l. B. purpurascens 



21. SOPHIA Adans. Tansy Mustard. 



Leaves all pinnately dissected; pod not twisted. 

 Pedicels ascending or spreading. 



Pods linear, 1 mm. wide, somewhat curved; seeds tiniserial. 



Stem simple or with erect-ascending branches; pods 8-25 mm. long. 

 Pods 15-25 mm. long; leaves mostly thrice pinnatifld. 



