Matthiola.] CRUCIFERJE. 23 



Tribe III. BRASSICE iE. Seeds 1-2-seriate ; radicle incumbent, longi- 

 tudinally folded or very concave. (Flowers yellow.) 



Pods terete or angled. Seeds 1 -seriate 9. Brassica. 



Pods compressed. Seeds 2-seriate, compressed 10. Diplotaxis. 



B. Pods short {not or not much longer than broad), dehiscing through their whole 



length, broad, Jiat or turgid, not compressed at right angles to the septum. 



(Flowers white or yellow.) (Pod sometimes long in Draba ; see Nasturtium 



in A.) 

 Tribe IV. ALYSSINE 2E. Seeds 2-seriate ; radicle accumbent. 



Petals entire. Pods oblong, flat, many-seeded 11. Draba. 



Petals 2-cleft. Pods oblong, flat or turgid 12. Eropbila. 



Petals entire. Pods circular, few-seeded 12*. A lyssum. 



Petals entire. Pods inflated, many-seeded 13. Cochlearia. 



Tribe V. CAMELINE.ffl. Seeds 2-seriate ; radicle incumbent. 



Tall berb, cauline leaves sessile auricled 13*. Camelbut. 



Small scapigerous water-herb. Leaves subulate... 14. Subular'a. 



C. Pods short, dehiscing throughout their length, much compressed at right angles 



to the septum, which is hence veny narrow. (Pod indehiscent in Senebiera.) 



Tribe VI. LEPIDINE'iE. Cotyledons straight incurved or longitudinally 

 folded, radicle incumbent. (Flowers white.) 



Pods dehiscent, many-seeded 15. Capsella. 



Pods didymous, indehiscent, 2-seeded 16. Senebiera. 



Pods dehiscent, 2-4-seeded 17. Lepidium. 



Tribe VII. THIiASPIDE'iE. Cotyledons straight, radicle accumbent. 

 Pods on horizontal pedicels. (Flowers white.) 



Pods notched. Petals equal. Filaments without scales 18. Thlaspi. 



Pods ovate. Petals very unequal. Filaments without scales ..19. Ibeiis. 

 Pods oblong. Petals unequal. Filaments with basal scales... 20. Teesdalia. 

 Pods oblong. Petals equal. Filaments without scales 21. Hutchinsia. 



D. Pods indehiscent or with very short valves which cover a few of the seeds only. 

 Tribe VIII. ISATIDE'-ffi. Pods indehiscent, 1-celled, 1-seeded ...22. Isatis 



Tribe IX. CAKILINE-ffi. Pods transversely 2-jointed, lower joint inde- 

 hiscent seedless or not, or 2-valved and 2- or more-seeded; upper joint 

 indehiscent, 1-2-celled. (Affinity with Brassicea.) 



Lower joint slender, seedless; upper globose, 1-seeded 23. Crambe. 



Lower joint 2-edged, 1-celled ; upper ensiform, 1-seeded 24. Cakile. 



Tribe X. RAPHANE'iE. Pods elongate, 1-celled, many-seeded, or indehis- 

 cent, or jointed, the 1-seeded joints indehiscent 25. Raphanus. 



1. MATTHI'OLA, Br. STOCK. 



Herbs, sometimes shrubby, downy with stellate hairs. Leaves entire or 

 sinuate. Flowers large. Sepals erect, lateral saccate at the base. Petals 

 with long claws. Pods elongate, terete or compressed ; septum thick, often 

 2-3-nerved ; stigmatic lobes erect, conniving, often thickened or horned at 



