420 CRUCIFERAE (MUSTARD FAMILY) 



* Fruit indehisccnt, 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-celled, dehiscent. 



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



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



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

 oblong to linear, 2-celled, dehiscent. Cotyledons incumbent. 



* Cauline hairs simple or stellate, not regularly bifid. 

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

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



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



petiolate. 



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



tion of fruit 1-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. 



+- -i- 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 accumbent (in Learemcorthia the embryo 

 sometimes nearly straight). 



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



23. 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. 

 - Petals yellow. 



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



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



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

 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. 



-*- -n- Pods elliptic-oblong or lance-elliptic, about 2.5 cm. broad, very flat. 



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



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

 = Peduncles radical, 1 -flowered. 



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



eye. 



peduncles not radical, several-flowered. 



_".'. Dentaria. Glabrous or pnl.orcnt with simple hairs. Kootstoek tleshy, toothed, or monili- 

 Coriii-tiiberoiis. Stem naked below, bearing near the middle _' :i vertieillate or alternate 

 leaves : these tor the rm>>t part palmately :! 7-foliolate, petiolate. Seeds \vii 



::n. Cardamine. ;ial>n>u> or pube-eent .with simple hairs, lihrous routed, rarely tuber-bearing. 

 Stem leafv ; leaves alternate, from ovate and eremite-dentate to pinnate. Seeds AN injrlrss. 



::| Arabis. I'siially pubeseeiit. some or all of the hair- beinir braiiehed. Hoots tibroiis ; no 

 tubers. Seeds usually winded or wing-margined. Leaves alternate simple or pinnatifid. 



