Fifteenth class. 
33 
— Siliquas inflated. Valves gen. without nerves 
Nasturtium. 32. 
45 (34). Seeds 1-seriate in each cell .... 40 
— Seeds 2-seriate in each cell .... 54 
46. Stig. composed of 2 erect laminte laid one against the 
other ......... 47 
— Stig. obtuse or indented ..... 48 
47. Laminae of the stig. with a horn on the back. Pis gray- 
tomentose.Matthiola. 30. 
— Laminae of the stig. flat. Green pis . Hesperis. 38. 
48. Yalves without nerves, or with a faint rudimentary nerve 
at the base ........ 40 
— Yalves with 1—3 nerves, in Arabis alpina faintly 
1-nerved or almost nerveless; comp, also Stenophragma 
50 
49. Root-stock covered with scales or teeth. Rad. Is 0 
Dentaria. 37. 
— Rt-stock without scales or teeth. Rad. Is gen. present 
Cardamine. 36. 
50. Ls entirely glabr., glaucous, the caul, cordate-sagittate 
at the base, entire ...... 51 
— Ls more or less hairy, or if glabr., not glaucous, gen. 
toothed, sinuate or pinnatifid .... 52 
51. Siliquas spreading, 4-cornered, 9—12 cm Conringia. 44. 
— Siliquas erect-spreading, compressed 4-cornered, 5—8 cm 
Arabis. 35. 
52. Siliquas 4-cornered. Yalves 3-nerved. Pis having a smell 
of garlic .. Alliaria. 40. 
— Siliquas compressed. Valves 1-nerved . . . 53 
53. Ls undiv. Siliquas with narrow partitions. Ann. pis. 
Caul, ls narrowed towards the base Stenophragma. 43. 
— Ls undiv. or lyrate-runcinate. Siliquas with broad par¬ 
titions. Perenn., ann., or bienn. pis, but, in this case, 
caul, ls cordate or sagittate at the base Arabis. 35. 
— Caul, ls pinnatipartite, with 2—4 pairs of linear seg¬ 
ments. Siliquas with broad partitions. Perenn. pis 
Sisymbrium. 39. 
54 (45). FIs in leafy racemes . . . Braya. 42. 
— FIs in leafless racemes ...... 55 
55. Siliquas terminated by a compressed beak (almost equal¬ 
ling them in length) . . ... . Eruca. 50. 
— Siliquas with a short beak or 0 . . • . 50 
56. Siliquas erect-applied, much compressed, about 6 times 
as long as the peduncle (60—80 mm). Caul. Is sagittate, 
entire ....... Turriiis. 34. 
— Siliquas spreading, cylindric, about as long as the ped¬ 
uncle (at most 50 wtm), Caul, ls pinnatisect 
Nasturtium. 32. 
