Vor. II.] MUSTARD FAMILY. Ii 
Pods slightly winged above, orbicular or oval, about 1’’ broad; petals present or none. 
Cotyledons accumbent; petals generally present. 4. L. Virginicum. 
Cotyledons incumbent; petals minute or wanting. 5. L. apetalum, 
Pods oblong, winged all around, longer than wide, about 2’’ high. 6. L. sativum. 
1. Lepidium campéstre (L.) R. Br. 
Field or Cow Cress. (Fig. 1684.) 
Thlaspi campestre I,. Sp. Pl. 646. | 1753. 
Le, sl campestre R. Br. in Ait. f. Hort. Kew, 4: 
1812. 
Annual or biennial, erect, 10o’-18’ high, branch- 
ing above, hoary-pubescent with scale-like hairs or 
rarely nearly glabrous. Basal leaves oblong, or 
spatulate-oblong, entire, or pinnatifid in the lower 
part, obtuse, petioled, 2’-3’ long; stem-leaves ob- 
long or lanceolate, entire or slightly dentate, ses- 
sile, clasping the stem by an auricled base; flowers 
white or yellowish; pedicels rather stout, spread- 
ing, 2/’-4’’ long in fruit; pods very numerous, 
forming dense elongated racemes, broadly ovate, 
slightly curved upward, about equalling their 
pedicels, or shorter, broadly winged at the apex, 
notched, tipped with a minute style. 
In fields and waste places, New Brunswick and On- 
tario to Virginia, and on the Pacific Coast, a bad weed 
in the Middle States. Naturalized from Europe. 
May-July. Also called Yellow Seed, Mithridate 
Mustard, and Poor Man’s Pepper. 
2. Lepidium Draba L,.. Hoary Cress. 
(Fig. 1685.) 
Lepidium Draba I,. Sp. Pl. 645. 1753- 
Perennial, erect or ascending, 10’-18/’ high, 
hoary-pubescent, branched at the inflorescence. 
Leaves oblong or lanceolate-oblong, obtuse, 
slightly dentate or entire, 114/—2/ long, the lower 
petioled, the upper sessile and clasping; pedicels 
slender, ascending or spreading, 3/’-6/’ long in 
fruit; flowers white, about 1//-2’’ broad; pods 
very broadly ovate, or cordate, 1%4’’ long, 2/” 
broad, arranged in short corymbose racemes; 
valves distinct, papillose, keeled, wingless, tipped 
with a slender style 1%4//-1’’ long. 
Near Astoria, N. Y., and on ballast about the sea- 
ports. Also in Colorado and California. Fugitive 
from Europe. Native also of Asia. April-June. 
3. Lepidium ruderale I. Roadside or 
Narrow-leaved Pepper-grass. (Fig. 1686.) 
Lepidium ruderale 1. Sp. Pl. 645. 1753. 
Annual, erect, 6/-15’ high, glabrous, wiry, 
freely branching. Basal and lower leaves oblong 
in outline, 1/-4’ long, 1-2-pinnatifid into linear 
or oblong obtuse segments; upper leaves smaller, 
entire or with a few lobes; flowers 14’ broad or 
less, greenish; petals none; stamens 2; pods flat, 
not margined, about 1/’ in length, short-oval 
or suborbicular; pedicels spreading or some- 
what ascending, very slender, 114’/-2’’ long in 
fruit; valves sharply keeled, barely winged; 
cotyledons incumbent. 
In waste places, on ballast and along roadsides 
about the cities, Nova Scotia to Texas. Naturalized 
from Europe. Has the odor of Wart-cress. Occurs 
also in Australia. Summer. 
