CRUCIFER/E. 37 



Tribe iv. Fruit longitudinally 2-celled, dehiscent, elongated, 

 terete or prismatic or compressed parallel to the partition. 



22 Thelypodinm. Pods slender, terete or quadrangular, often toruloee, 

 on a short thick stipe : valves 1-nerved : cotyledons incumbent. 



23 Stanleya. Pods terete or subterete, on a slender elongated stipe : valves 

 1-nerved: cotyledons incumbent. 



Tribe v. Pods short, scarcely longer than broad, turgid or ob- 

 compressed. Cotyledons incumbent. 



24 Braya. Pods oblong to linear-oblong with flattish or convex faintly- 

 nerved but not keeled valves. 



25 Camelina. Silicle obovoid, 2-celled and many-seeded, with somewhat 

 firm strongly convex valves, and thin obovate partition. 



26 Subnlaria. Silicle turgid, subglobose, pyriform or short fusiform. 

 dehiscent, several-seeded : cotyledons incumbent : aquatic herbs with 



subulate leaves. 



Tribe vi Pods long or short, dehiscent their whole length or 

 the apex indehiscent Cotyledons longitudinally conduplicate. 



27 Brassica, Pods slender and longitudinally dehiscent to near the apex. 



.Series ii. Pods short, dehiscent their whole length. Valves 

 more or less obcompressed, the partition usually narrow. 



Tribe vii. Pod a 2-celled silicle, strongly obcompressed or 

 turjid. Pubescence wholly simple or none. 



28 Bursa. Pods obcordate, reversed deltoid in outline. 

 2? itutchinsia. Pods elliptical, entire at the apex. 



30 Coronopus. Pods more or less distinctly didymous with thickish 



valves, falling off as closed or nearly closed 1-seeded nutlets : terres- 

 trial herbs but growing in wet places. 



31 Lepidium. Pods strongly obcompressed ; with usually 1-seeded cells : 

 cotyledons incumbent. Terrestrial herbs. 



32 Thlaspi. Pods strongly obcompressed, dehiscent ; cells 2 to several 

 seeded: cotyledons accumbent. Glabrous terrestrial herbs. 



Series hi. Pods short, [rarely long], usually crustaceous and 

 indurated, indehiscent, 1-2 -celled, with 1-2 seeds in each cell. 



Tribe ix. Pods orbicular to elliptical. Ovule suspended. 



33 Heterodraba. Pods short-elliptical, twisted, not margined, very tardi- 

 ly dehiscent, by a very filmy partition 2-celled. 



34 Athysanus. Pods orbicular, not margined, uncinate-hispid, indehis- 

 cent : ovary 1 -celled, 3-4-ovuled but only one maturing. 



35 Thysanoearpus. Pods orbicular to obovate, wing-margined, 1-celled 

 indehiscent: ovary 1-ovuled: pubescence simple. 



Series iv. Pods elongated, indehiscent, 1-celled and many- 

 seeded, or many -celled with 1 seed in each cell. 



Tribe x. Pods elongated, terete or somewhat prismatic, often 

 tOrose, multicellular and indehiscent. 



36 Raphaiius. Fruit an indehiscent multicellular or transversely divid- 

 ed pod. 



