554 BRASSICACEAE 
. BURSA Weber. Annual erect herbs. Leaves sometimes mainly 
basal: blades entire to pinnatifid. Raceme terminal. Sepals 4, spreading. 
etals 4 ch longer than the sepals. 
—Four species, in the Northern Hemisphere. 
Some appear to be unstable and develop 
mutants. 
B. Bursa-pastoris d Britton. Stem 
m. tall: basal leaves 3-15 em. long; 
ce 
E- 
£u 
ct 
es of ste 
base; Pas 10-15 mm. long: sepals 
T m reas petals dd spatulate, 2 Y 3 
. lon pod 5-8 ng.— 
PER. 
almost throughout N. A. Nat. of Eu. — Spr .fall—Plants grown from Pn 
purs s at T Ala., have been bue d as B. tuscaloosae Shull. 
rom plants of B. Bur ursa-pastoris in the bae T curved and rather 
blunt leaf-lobes — Known only from the original statio 
| .$. LEPIDIUM [Tourn.] L. Annual, biennial, or perennial herbs. 
 Leaf-blades entire to sine Racemes yn Sepals 4, spreading. 
Petals 4, longer than the sepals or wanting. s usually fewer than 6. 
ame 
Ovule, and seed, 1 in each earpel. Pod ER to oblong.—About 65 
speeies of wide duis .—Spr.-sum.—PEPPER-GRASSES.  PEPPER-CRESSES. 
CHURL’S-CRESSES. 
Blades of the cauline leaves sagittate-clasping : pod winged. 1. L. campestre. 
Bl acen ny cauline leaves tapering at the base: pod wingless, 
Cotyl Eden accumbent. 
Cotyledons incumbent. 
Pod wingless and marginless : plant strong-scented. 3. L.ruderale. 
Pod be ee or Margined at the apex: plant not strong- 
ent 
2. L. virginicum. 
4. L. densiflorum. 
id. pep dala Eve. R. Br. Plan dm. tall, softly fine-pubescent 
blades of the lower leaves spatulate b EM those of the upper ice 
sagittate, oo shallo wly toothed: pedi- 
0 mm. p ov 
long, Et Shoe the base, minutely pubes- 
nt. —(COW-CRESS. dem D-CRESS.)— Was 
D. rarely Coastal Plain, N. C. to Kans 
Ont and N. B.; also on Pacif. coast. 
2. x virginicum L. Annual or biennial, 
more or less puberulent: ed zr 9 dm. ta 1 
ceo ,t 
incised, the terminal one much longer than 
