467 
4  Flowers  small  (3mm.  diam.) ;  lobes  of  petals  con¬ 
tiguous -or  nearly  so;  silicules  ovate-suborbicular, 
3mm.  long  x  2-firnm.  broad,  rounded  at  top. 
D.  prcecox  Stev. 
r lowers  larger  (3*5— 4mm.  diam.);  lobes  of  petals 
divaricate  or  divergent ;  silicules  elliptic-obovate, 
4— 7mm.  long  x  2*5— 8mm.  broad. 
D.  spathulata  Hoppe. 
5  Plant  +  robust,  with  short  bi-  or  trifid  hairs; 
Flowers  large  with  ovate- rot  undate  sepals ; 
silicules  elongate  oblong  or  oblong-lanceolate, 
large  ;  seeds  30 — 40.  D.  majuscula  Nob. 
Plant  +  slender,  with  mostly  bifid  some  simple 
hairs;  sepals  ovate  or  oblong;  silicules  elliptic 
or  oblong;  seeds  16 — 24. 
6  Leaves  lanceolate  or  linear-lanceolate ;  silicules 
oblong.  Z).  leptophylla  Nob. 
Leaves  ovate-lanceolate  or  lanceolate ;  silicules 
narrow-lanceolate  or  linear-oblong. 
D.  lanceolata  Neilr. 
Leaves  broader,  ovate  or  elliptic ;  plant  with  fairly 
long  hairs  ;  silicules  oblong  or  sublanceolate. 
D.  vulgaris  Nob. 
Series  I.  BIFIDZE  Nob.  Hairs  all  or  nearly  all 
bifid  or  trifid,  very  rarely  with  simple  hairs  intermixed. 
Subsp.  I.  D.  majuscula  Fouy  &  Fouc.  E.  majuscula 
Jord.  Scapes  6— 20cm.,  fairly  robust.  Hairs  short 
2—3-fid.  Leaves  mostly  ovate,  broad.  Petals  much 
exceeding  calyx.  Silicules  large  oblong,  rounded  at 
top  ;  seeds  80 — 40. 
Subsp.  II.  D.  lanceolata  Neilr.  E.  stenocarpa  Jord. 
Scapes  capillary  or  slender,  and  usually  numerous. 
Leaves  lanceolate  or  ovate-lanceolate.  Hairs  2 — 8-fid, 
short.  Petals  little  longer  than  calyx.  Silicules  + 
large,  lanceolate-linear,  or  linear-oblong ;  seeds  30 
— 36, 
