MUSTARD FAMILY 279 
10. ALYSSUM, L. 
Stems branching, low, hairy, with small flowers. Pod orbicular, with 
a small style at apex. 
A. alyssoides, L. (Fig. 2, pl. 55.) YeLLow or SMALL ALYSSUM. 
(A. calycinum, L.). Leaves, mostly on the flowering stems, small pear- 
shaped, without teeth or notches. In waste places and fields. Naturalized. 
THIRD GROUP 
Fruit in linear pods, generally in length more than four times the 
diameter of the flower. 
Flowers yellow 
Seeds in a single row in each valve of the pod. 
11. BARBAREA, R. Br. 
Erect branching herbs with angular stems and with leaves with entire 
margins or with margins deeply lobed, forming distinct segments, or 
feather-formed. Flowers somewhat conspicuous, petals twice as long as 
the sepals. Pod long, linear, 4-angled. 
od aetilhy gemeeel 6 5 6 6 6 6 6 0 Bb oo 6 po Gg Bh RGUS 
Pods bluntly 4-angled. 
Diverging strongly from stem . lee act ee el a Dem UMlcants: 
Standing almost parallel with the’ stem a) awe) ee eo ls to seb erStItGLa 
1. B. vulgaris, R. Br. (Fig. 2, pl. 54.) YeL~Low RocKeT oR CRESS. 
(B. Barbarea, Mac M.). Stem 1 to 2 ft. high. Tufted at base. Lower 
leaves so deeply lobed as to divide them into about 5 distinct leaflets, 
the terminal one much larger than the others, ovate with rounded ex- 
tremity and cordate base, the lateral leaflets also ovate and rounded at 
apex. Upper leaves smooth margined or notched. Lower leaves on slen- 
der foot-stalks, upper without foot-stalks. Seed pods diverging from the 
stem. Naturalized. Common, in fields and waste places. April-July. 
2. B. stricta, Andrz. Erect-rruirep WINTER Cress. Similar to No. 
1, but the seed pods follow closely the direction of the stem. Naturalized. 
In fields and waste places. April-July. 
3. B. praecox, (J. E. Smith.) R. Br. Earry Winter Cress. BELLE 
IsLE Cress. The segments of lower leaves generally more numerous than 
in No. 1 or 2, and less rounded. Pods very long and sharply angled. 
Naturalized. Situations similar to the above. 
12. BRASSICA, L. 
Herbs mostly with basal leaves deeply cut by sinuses (feather-formed), 
- upper leaves toothed or entire. Pods nearly round, terminated by a long 
beak. Seeds in a single row in each valve. 
Wpper leaves clasping the stem’ < . =< « « « « « « «s SB. campestris 
Upper leaves not clasping. 
Pods nearly Frail Withe Sterne wep cpl cle Jolt oli bow oth va Oe era 
Pods spreading. 
Slendem a withmveryalonen peak) wie) san) fe -eieo ics) se) renee guencea 
Rather thick peak, not -very, lounge.) cs) cs sn Ba aruensts 
1. B. nigra, (L.) Koch. (Fig. 4, pl. 54.) Brack Musrarp. Plant 
somewhat hairy, 2 to 7 ft. high. Upper leaves lance-formed, margins 
