. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. I. Thlaspi arvense L. Field Penny- cress. Frenchweed. Fig. 2045. Thalspi arvense L. Sp. PI. 646. 1753. Annual, erect, glabrous, 6'-i8' 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 whi
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. I. Thlaspi arvense L. Field Penny- cress. Frenchweed. Fig. 2045. Thalspi arvense L. Sp. PI. 646. 1753. Annual, erect, glabrous, 6'-i8' 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 i" long, i" broad; pedicels spreading or curved upward, slender, 5"-9" long in fruit; pods nearly orbicular 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, Quebec to New York, Manitoba and Kansas. Naturalized from Europe. Native also of Asia. June—Aug. Bas- tard cress. Dish-mustard. 2. Thlaspi perfoliatum L. Perfoliate Penny-cress. Fig. 2046. Thlaspi perfoliatum L. Sp. PI. 646. 1753. Annual, glabrous, branched at the base, stems commonly simple, slender, ascending or erect, i'-y' tall. Basal leaves ovate or suborbicular, often petioled; stem-leaves oblong or oblong- lanceolate, sessile, auricled at the base and clasping the stem, i'-i' long, 3"-6" wide, obtuse or acute at the apex; pedicels filiform, spreading; silicic obovate-orbicular, 2"-3" broad, rather narrowly wmged, broadly notched at the summit; style short but mani- fest; seeds usually 4 in each cell. Hamilton, Ontario, and Geneva, New York. Advcntive from Europe. May-Aug. 20. MYAGRUM L. Sp. PI. 640. 1753. An annual glabrous glaucous branching herb, with entire or undulate oblong to lanceolate leaves, the lower petioled, the upper sessile and deeply auricled at the base. Flowers small, yellow, in elonga
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
