420 CRUCIFEBAE (MUSTARD FAMILY^ 



f Fruit indehlscont, often moniliform, 1-celled or transversely several-celled, the partitions spongy 



or pithy. 



14. Raphanus. Petals large, pale yellow or purplish. Fruit stout, beaked. 



* * Fruit longitudinally 2-ceUed, dehiscent. 



15. Brassica. Seeds globose, in a single row in each cell. 



16. Diplotaxis. Seeds ovoid, in 2 rows in each cell. 



Tribe VII. SISYMBrIeAE. Stigma, when lobed, with lobes over the placentae. Fruit lance 

 oblong to linear, 2-c6lled, dehiscent. Cotyledons Incumbent. 



* Cauline hairs simple or stellate, not regularly bifid. 

 4- Petals small (not over 1 cm. long), yellow, white, or pale purple. 



17. Conringia. Glabrous. Leaves elliptical, entire, cordate, sessile. 



18. Alliaria, Glabrous or pubescent. .Leaves orbicular or reniform, broadly cordate, toothed, 



, lietiolate. 



19. Sisymbrium. Pubescent. Leaves various but not as in either of the two preceding. Parti- 



tion of fruit l-nerved or, if not nerved, of thin -walled elongated cells. 

 20 Braya, Pubescent. Leaves small, narrowly oblong or spatulate, toothed or subentire, ses- 

 sile. Partition of the fruit without midnerve, its cells thick-walled, 

 -t- +- Petals large (1.5-2 cm. long), deep purple, 



21. Hesperis. Tall. Leaves ovate-lanceolate, denticulate, the lower long-petioled. Pods very 



long and slender, 



* * Cauline hairs 2-branched, the branches vertical and appressed. 



22. Erysimum. Petals yellow or orange. Leaves lanceolate to linear, not clasping, entire or 



toothed. 



Tribe VIII. ARABfDEAE. Fruit 2-celled, dehiscent, globose to long and slender, terete or 

 flattened parallel to a broad partition. Cotyledons accurabent (in Lea/venwortMa the embryo 

 sometimes nearly straight), 



* Fruit globose to ovoid or oblong and terete ; petals yellow or white. 

 28. Radicula. Flowers small. Leaves toothed, lobed, or pinnate. 

 * * Fruit either terete and elongated or elliptic- or linear-oblong and strongly compressed parallel 



to a broad partition, 

 ■H Petals yellow. 



24. Barbarea. Pods slender, terete or nearly so. BiennlaJs. 



25. Selenia. Pods broadly elliptic-oblong^ very flat. Low annual. 



+- +- Petals white, pink, or purple, not yellow except sometimes near the brse. 

 ■H- Pods long and slender, not at all compressed parallel to the partition. 



26. lodanthus. Lateral sepals somewhat horned on the back near the apex. Petals broadly 



spatulate, purple, 



++ ++ Pods^ elliptic-oblong or lance-elliptio, about 2.5 cm. br«ad, very flat. 



27. Lunaria. Petals purple. Leaves deltoid-ovate. 



++++++ Pods distinctly compressed parallel to the partition, but not over 1 em. broad. 

 = Peduncles radical, 1-flowered. 



28. Leavenworthia. Pods oblong, sometimes torulose. Flowers purple or white with a yellow 



eye. 



-=" •= Peduncles not radical, several-flowered. 



29. Dentaria. Glabrous or pubescent with' simple hairs. Eootstock fleshy, toothed, or monili- 



form-tuberous. Stem naked below, bearing near the middle 2-3 vertioillate or alternate 

 leaves ; these for the most part palmately 8-7-foliolate, petiolate. Seeds wingless. 



30. Cardamine. Glabrous or pubescent with simple hairs, fibrous-rooted, rarely tuber-'bearing. 



Stem leafy ; loaves alternate, from ovate and crenate-dentate to pinnate. Seeds -wingless. 



31. Arabls. Usually pubescent, some^or all of the hairs being branched. Roots fibrous; no 



tubers. Seeds usually winged or wing-margined. Leaves alternate simple or plnnatlfid 



