Vou. II.] MUSTARD FAMILY. 113 
5. CORONOPUS Gaertn. Fruct. & Sem. 2: 293. 1791. 
Annual or biennial, diffuse herbs, with mostly pinnatifid leaves, and small whitish flow- 
ers. Silicles small, didymous, laterally compressed, sessile. Stamens often only 2 or 4. 
Valves of the capsule oblong or subglobose, obtuse at each end, indehiscent, falling away 
from the septum at maturity. Seeds r in each cell; cotyledons narrow, incumbent or con- 
duplicate. [Greek, crow-foot, from the shape of the leaves. ] 
About 6 species, of wide geographic distribution in warm and temperate regions. 
Pod rugose, not crested. 1. C. didymus. 
Pod coarsely wrinkled, crested. 2. C. Coronopus. 
1. Coronopus didymus (JL.) J. E. 
Smith. Lesser Wart-cress. 
(Fig. 1690. ) 
Lepidium didymum I,. Mant. 92. 1767. 
Senebiera didyma Pers. Syn. 2: 185. 1807. 
Coronopus didymus J. E. Smith, FI. Brit. 3: 691. 
1800. 
Diffuse, tufted, spreading on the ground, spar- 
ingly pubescent. Stems 2’-15/ long, branching; 
leaves deeply 1-2-pinnatifid, the lower slender- 
petioled, the upper sessile; flowers minute, 
white, racemose; pedicels slender, 1//-114/’’ 
long in fruit; pod didymous, about 1’ broad 
and slightly more than 14’ high; valves rugose, 
obtuse at each end and readily separating into 
2 ovoid nutlets. 
In waste places, Newfoundland to Florida, Mis- 
souri and Texas, west to California. Abundant in 
ballast about the northern seaports. Also through- 
out tropical America and widely distributed in the 
Old World. Summer. Naturalized from the South. 
2. Coronopus Coronopus (JI,.) Karst. 
Wart or Swine’s Cress. (Fig. 1691.) 
Cochlearia Coronopus 1,. Sp. Pl. 648. 1753. 
Senebiera Coronopus Poir. in lam. Encycl. 7:76. 1806. 
Coronopus Coronopus Karst. Deutch. Fl. 673. 1880-83. 
Diffuse, tufted, spreading on the ground, succulent, 
glabrous and glaucous, or with a few spreading hairs, 
branching. Stems 2’-15/ long; leaves similar to those of 
the last species, generally larger, sometimes less divided; 
flowers similar; pedicels stout, 1/’ long or less; pod 2// 
broad and about 114’ high, flattish, rounded, apiculate 
at the summit, marked with coarse wrinkles which form 
a crest around the margin; valves not distinctly separate. 
In waste places and on ballast, New Brunswick to Florida 
and the Gulf States. Fugitive or adventive from Europe. 
Sometimes called Buckshorn and Herb Ivy. Summier. 
6. THLASPI L. Sp. Pl. 645. 1753. 
Erect glabrous annual or perennial herbs, with entire or dentate leaves, the basal ones 
forming a rosette, those of the stem, or at least the upper ones, auriculate and clasping. 
Flowers white or purplish. Siliques obcuneate, obcordate, or oblong-orbicular, mostly emar- 
ginate, flattened at right angles to the narrow septum, crested or winged. Valves dehiscent. 
Seeds 2 or several in each cell, wingless. Cotyledons accumbent. [Greek, to flatten, from 
the flat pod. ] 
A genus of about 25 species, natives of temperate, arcticand alpine regions. In addition to the 
following, 2 others occur in arctic America, the Rocky Mountains and California. 
Lower stem-leaves not clasping; seeds rugose. 1. T. arvense. 
All the stem-leaves cordate-clasping; seeds smooth. 2. T. perfoliatum, 
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