BRASSICACEAE 561 
15. ARABIDOPSIS Schur. Annual or perennial herbs. Leaf-blades 
entire, toothed, or pinnatifid. ceme elongate. Sepals 4, narrow. Petals 4, 
nir 6: anthers 
ovoid. Style sior t. Pod elongate.— 
bout 12 species, North American and 
Eurasian 
1. A. Thaliana (L.) Britton. Plant 0.3-5 
dm. tall, mainly 2r ched throughout, pubes- 
cent near the bas rca of the dein leaves 
elliptic, or Apes olate, 1.5-4.5 ong; 
entire or shallowly io tod. sepals Lt. om 
long: petals about tw iie as long as 
Q— 
fields, | 
various provinees, Ga. to Ark., Utah., Minn., Ont., and Mass.—Nat. of 
Eu.—Spr. 
16. CAMPE Dulac. Biennial or perennial herbs. Leaf-blades lyrate- 
pinnatifid. nup Or ip often dense. Sepals 4, a Petals 4, 
h i Style 
natives of temperate Bini Du a A WINTER-CRESSES. ROCKETS 
ARDS. 
Pod Pru ya obtusely 4-angled: leaf-segments 3-9. 
Pod spreading or ascending: corolla bright- -yellow. 1. C. Barbarea. 
Pod Bree and appressed: corolla pale-yellow. 2. C. stricta. 
Pod stout-pedicelled, acutely 4-angled: leaf-segments 9-17. 3. 
1. C. ep a (L.) W. F. Wight. Plant 2-9 dm. tall: leaves 5-15 cm. long, 
or shorter above; blades of the lower ones P those of the upper ones 
A or incised: sepals mostly 3-3.5 mm 
long: p 5.5 mm. long: — m 
long, slender-beaked. [B. vulgaris R. Br 
—(BITTER-CRESS. YELLOW-ROCKET.)——RKoad- 
sides and fields, and cult. grounds, jorge 
provinees, on Coastal Plain only N, . to 
N. Y. and Ont., and locally in ue uo 
and on Pacif. coa ast. Native northward and 
in Eu S sum. 
2. cta (Andrz.) W. F. Wight. Plant 
a m that of C. Barbarea in habit a 
y i A aed mostly 4—4.5 mm. long: pet 
als 6.5 mm. long: pod 2-2.5 em. lore: 
pbi nen a. [B. stricta Bp ane 
S i d fields, and cult. grounds, vari 
S provinces, Fla. to Nebr. , Alas., Ont., ad Que. Nat. er and in 
es 
C. verna (Mill) Heller. Plant 1-6 dm. tall: leaves 2-15 em. long; blades 
pinneti the segments toothed: sepals 3-3.5 mm. long: petals about twice as 
ong as the sepals: pod 3.5-8 em. long. [B. verna Asch.]— (EARLY WINTER- 
36 
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