318 The Ohio Journal of Science [Vol. XVII, No. 8, 



1. Thlaspi arvense L. Field Penny-cress. Stems erect, 

 glabrous, 6-18 in. high, branching above; basal leaves petioled, 

 oblanceolate, entire, falling away early; stem-leaves slightly 

 dentate, 1-3 in. long, the lower sessile, the upper clasping 

 by a sagittate base; flowers very small, white; pods nearly 

 orbicular when ripe, \-\ in. broad, winged all around, notched 

 at the top. 



In waste places, naturalized from" Europe. Cuyahoga, 

 Henry, Highland, Belmont (Laughlin Herbarium). 



2. Thlaspi perfoliatum L. Perfoliate Penny-cress. Stems 

 slender, erect, glabrous, 3-7 in. high, usually branching at the 

 base; basal leaves petioled, ovate or orbicular; stem-leaves 

 ovate, sessile, clasping by an auricled base, ^-1 in. long, upper 

 leaves nearly perfoliate; flowers small, white; pods \ in. broad 

 or less, winged, notched at the top. 



In gravel soil, adventive from Europe. Clermont County. 



15. Myagrum L. Myagrum. 



Annual erect branching herbs, with entire or undulate 

 lanceolate leaves and small yellow flowers in elongating racemes. 

 Longer stamens somewhat connate in pairs. Silicles obcuneate 

 to spatulate, indehiscent, 1-seeded. A monotypic genus. 



1. Myagrum perfoliatum L. Myagrum. Stem glabrous and 

 glaucous; lower leaves narrowed into petioles; upper leaves 

 oblong, obtuse, 2-5 in. long, with rounded basal lobes; pods 

 as long as the ascending pedicels. 



In waste places, fugitive from Europe. Lake County. 



16. Alliaria Adans. Garlic Mustard. 



Biennial, erect branching herbs, glabrous or slightly pubes- 

 cent, with broad, coarsely dentate cordate or rounded leaves 

 and white flowers in racemes. Sepals caducous, petals long- 

 clawed, stamens (>. Sihques long, linear, dehiscent from the 

 base. Seeds in 1 row in each cavity, wingless. 



1. Alliaria alliaria (L.) Britt. Garlic Mustard. Stems 

 tall, 1-3 ft. high, nearly glabrous; leaves broadty ovate or 

 cordate, petiolate, 2-7 in. broad; basal leaves round, crenate, 

 long petioled; flowers small, white; pods 1-2 in. long, on short 

 stout pedicels. 



Naturalized from Europe in waste places near dwellings. 

 No specimens. (Erie County — Moseley Herbarium). 



