CRUCIFERAE (MUSTARD FAMILY) 
691 
Siliques linear, 1.5-10 cm. long; seeds in 1 row or only ob- 
scurely in 2 rows 
Siliques terete or quadrate-cylindric. 
Rosette-leaves fleshy, linear-oblanceolate, entire; caudex 
stout; scapes naked; siliques lance-subulate, 4-9 mm. 
long, 10-1 6-o vuUto; high-northern plants (Nfld. with us). 
Rosette-leaves thinner, oblong, oblanceolate or narrowly 
ovate, often toothed; caudex slender or scarcely devel- 
oped; flowering stems leafy; siliques slenderly linear- 
terete or -tetragonal, 1-3 cm. long, many-seeded. 
Perennial with slender branching caudioes; siliques te- 
rete, torulose, 1.2-3 cm. long; cells of septum obliquely 
or transversely elongate 
Annual without branching caudex; siliques tetragonal- 
cylindric, with straight margins, 1-1.5 cm. long; cells of 
septum vertically elongate. 
p. Hairs all simple or often quite wanting; ripe valves of silique 
elastic, coiling or rolling into rings upon falling 
n . Leaves deeply pinnatifid or pinnate. 
Leaves bi- or tripinnate or pinnatifid; siliques slenderly cylindric 
to clavate; cotyledons incumbent ; petals yellow or yellowish. . 
Leaves once pinnate or pinnatifid; siliques flattened; cotyledons 
accumbent; petals white to purple. 
Leaves pinnate, at least the lower with distinct leaflets; valves 
of silique elastic, coiling upon dropping; seeds wingless. . 
Leaves stiffly pinnatifid; valves stiff, not coiling; seeds winged. 
m.Flowering stem without definite basal rosette. . . q. 
^.Raceme with lower flowerr subtended by leafy bracts; leaves deeply 
pinnatifid or bipinnatifid; siliques slender, 4-angled, 2. 5-3. 5 cm. 
long, their valves keeled 
g.Raceme with flowers ebracteate. . . r. 
r.Siliques flattened. 
Leaves and stems glabrous or with simple hairs; siliques 0.5-3 
cm. long. 
Cauline leaves auricled, sharply and often doubly toothed; 
valves of silique 1-nerved, not elastic 
Cauline leaves not auricled, if simple merely sinuate or den- 
tate; valves nerveless, elastic and coiling after falling. 
Leaves or stems usually bearing some forked hairs; siliques up 
to 10 cm. long 
r.Siliques terete or 4-angled. . . s. 
8 . Stems bearing closely appressed straight 2-pronged hairs at- 
tached near the middle (malpighiacoous hairs) 
8 . Stems glabrous or with simple or stellate hairs. . . t. 
LCauline leaves sagittate- or cordate-clasping. 
Silique tapering to a terete indehiscent beak 0.8—2 cm. long; 
seeds globose ; cotyledons conduplicate ; petals deep yellow. 
Silique very slender, tapering to thick short style; seeds 
oblong or flat; cotyledons not conduplicate; petals 
creamy to yellow. 
Leaves simple, not lyrate; petals pale yellow or creamy. 
Cauline leaves elliptic, cordate-clasping; silique an- 
gled; seeds plump, in 1 row; cotyledons incumbent. 
Cauline leaves lanceolate to oblong, sagittate-clasping; 
silique terete; seeds flat, obscurely 2-seriate; coty- 
ledons accumbent. 
Leaves, or some of them, lyrate-pinnatifid ; seeds oblong 
to quadrate; cotyledons accumbent; petals deep yellow. 
LCauline leaves not clasping. . . u. 
u . Fruit terminated by a conical to flat or 3-angled indehiscent 
beak. 
Seeds globose, in 1 row in each locule 
Seeds ovoid or ellipsoid, in 2 rows in each locule. 
Siliques terete, the beak slenderlj' conical; lower pedi- 
cels 0.5-3. 5 cm. long 
Siliques 4-angled, tipped by a flat triangular-lanceolate 
beak; lower pedicels 0.5-5 mm. long 
w.Fruits dehiscent to tip, without long indehiscent beak. 
. v. 
43. Arabia. 
29. Braya. 
29. Braya. 
27. Arabidopsis. 
41. Cardamine. 
28. Descurainia. 
41. Cardamine. 
42. Sibara. 
21. Erucastrum. 
36. Iodanthus. 
41. Cardamine. 
43. Arabis. 
31. Erysimum. 
20. Brassica. 
24. Conringia. 
43. Arabis. 
35. Barbarea. 
20. Brassica. 
22. Diplotaxis. 
23. Eruca. 
