II4 CRUCIFERAE. (Vor. II. 
1. Thlaspi arvénse I. Field Penny-cress. (Fig. 1692.) 
Thlaspi arvense I,. Sp. Pl. 646. 1753. 
Annual, erect, glabrous, 6/—18’ high, sim- 
ple or branching above. Basal leaves 
petioled, oblanceolate, early deciduous; 
stem-leaves oblong or lanceolate, sparingly 
dentate, the upper clasping the stem by an 
auricled base, the lower merely sessile; 
flowers white, about 1/” long, %4’’ broad; 
pedicels spreading or curved upward, slen- 
der, 5’’-9’’ long in fruit; pods nearly orbicu- 
lar when ripe, 4/’-6’’ broad, very flat, 
broadly winged all around, notched at the 
apex, in long racemes; style minute, or 
none; seeds rugose, about 6 in each cell. 
In waste places and on ballast, sparingly 
adventive or fugitive from Europe in the East- 
ern and Middle States, but abundant in Que- 
bee and a bad weed in Manitoba and the 
Northwest Territory. Native also of northern 
Asia. June-Aug. Called also Bastard Cress. 
2. Thlaspi perfoliatum IL. Perfoli- 
ate Penny-cress. (Fig. 1693.) 
Thilaspi perfoliatum I. Sp. Pl. 646. 1753. 
Annual, glabrous, branched at the base, 
stems commonly simple, slender, ascending 
or erect, 3/-7’ tall. Basal leaves ovate 
or suborbicular, often petioled; stem-leaves 
oblong or oblong-lanceolate, sessile, auricled 
at the base and clasping the stem, 1%4/-1/ 
long, 3/’-6’’ wide, obtuse or acute at the 
apex; pedicels filiform, spreading; silicle ob- 
ovate-orbicular, 2//-3// broad, rather nar- 
rowly winged, broadly notched at the sum- 
mit; style short but manifest; seeds usually 
4 in each cell. 
Near Hamilton, Ontario. Fugitive or adven- 
tive from Europe. May-Aug. 
7. COCHLEARIA L, Sp. Pl. 647.1753. 
Annual or perennial maritime herbs, with simple alternate mostly fleshy leaves, and 
white or rarely purplish or yellowish racemose flowers. Silicle inflated, oblong or globose. 
Valves very convex, dehiscent. Stigma nearly simple, or capitate. Seeds several in each 
cell of the pod, usually in 2 rows, marginless. Cotyledons mainly accumbent. [Greek, 
spoon, from the shape of the leaves. ] 
A genus of about 25 species, not well understood, all natives of the colder parts of the north 
temperate zone. Besides the following, about three others are found on the arctic and northern 
Pacific coasts of North America. 
