ae 
Cruciferaceae 181 
SUBULARIA. . AWL-WORT 
Annual, small, aquatic, submerged; stem scapose. Leaves linear, subulate. Flow- 
ers minute, white, distant, in a terminal raceme. Stigma sessile, entire. Pod oblong or 
elliptic, short-stiped; valves convex, ribbed on the back. Seeds few, in 2 rows in each 
cell, marginless. (L. subula—an awl; from the leaves.) W. E. 
; S. aquatica L. (Water Awl-wort) 
LEPIDIUM PEPPER-GRASS 
Leaves small, pinnatifid or merely dentate. Flowers white (ours) or yellow, small, 
in terminal racemes. Sepals short, obtuse, equal at base. Petals entire, rounded at apex, 
sometimes none. Stamens 2—6, free. Style O—1. Pod orbicular or ovate, emarginate 
to deeply notched at the apex, strongly flattened at right angles to the partition; valves 
acutely keeled; cells |—2-seeded. Seed not winged. (Gk. lepidion—a little scale; from 
the form of the fruit.) 
A. Stem-leaves with a sagittate-clasping base. U. 
iby campestre R. Br.  (Cow-cress) 
AA.  Stem-leaves narrowed into a petiole at base or at least not clasping. 
B. Capsule 2-toothed at apex. 
C. Plant glabrous or nearly so; petals none. W. 
L. oxycarpum T. & G. 
CC. Plant hispidulous or pubescent. 
D. Leaves linear, usually entire, tapering at both ends; petals usually none. E. 
(L. acutidens.) L. dictyotum Gray 
DD. Leaves pinnatifid; petals none. W. (L. reticulatum; L. oreganum.) 
L., strictur, Ratt. 
BB. Capsule obcordate to merely retuse at apex, not 2-toothed. 
E. Styles present but sometimes short, persistent. 
F. Leaves entire. E. L. integrifolium Nutt. 
FF. Leaves pinnatifid. 
G. Plant glabrous; pod wing-margined all around. W. 
L. sativum L. (Garden-cress) 
GG. Plant minutely pubescent or puberulent; pod wing-margined only above. 
E. (L. idahocnse; A. simile.) 
L. montanum Nutt. 
EE. Style none. 
H. Pod 4—5 mm. long, shining. E. 
\ L. nitidum Nutt. (Tongue Grass) 
HH. Pod 2—3 mm. long, not shining. 
I. Petals none or not exceeding the sepals. 
J. Leaf-segments usually acute; pod glabrous. 
K. Annual; petals none; plant branching above. E. 
L. apetalum Willd. 
KK. Biennial; petals about as long as the sepals; plant branching 
from near base. E. 
L. ramosum Nels. 
JJ. Plant branching from near the base; leaf-segments usually obtuse; 
ped somewhat hairy. E. 
L. lasiocarpum Nutt. 
II. Petals present, equaling or exceeding the sepals. 

