Thlaspi arvense
 
Penny Cress or Stinkweed

Whole Plant

Regina
21-May-2015

bullet

Thlaspi: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
bullet

plants of lowland habitats; NOT [plants of alpine habitats]

bullet

plants mostly terrestrial; NOT [plants aquatic, usually submerged]

bullet

plants glabrous; NOT [plants not glabrous, puberulent to pubescent]

bullet

plants with leafy stems; NOT [plants with basal leaves only]

bullet

cauline leaves often clasping

bullet

cauline leaves often auriculate

bullet

petals white; NOT [petals yellow]

bullet

fruit 8-18 mm long; NOT [fruit shorter]

bullet

fruit 2-3 times longer than broad or shorter; NOT [fruit much longer than broad]

bullet

fruit orbicular; NOT [fruit ovate to orbicular], NOT [fruit triangular]

bullet

fruit not strongly inflated

bullet

fruit strongly flattened

bullet

fruit flattened at right angles to septum (central partition); NOT [fruit flattened parallel to septum, if at all]

bullet

fruit broadly winged all round; NOT [fruit wingless or only narrowly winged towards the apex]

bullet

more than one seed in each compartment of pod; NOT [one seed in each compartment of pod]

 

bullet

Cruciferae Answers to key questions in Budd's Flora leading to this genus. 
bullet

herbs; NOT [shrubs or trees]

bullet

plants terrestrial or semiaquatic; NOT [plants aquatic, leaves submerged or floating]

bullet

plants not with colored milky juice

bullet

plants with more than one normal leaf

bullet

some or all leaves alternate; NOT [leaves opposite, whorled, or basal]

bullet

leaves without stipules, or having glands; NOT [leaves with stipules]

bullet

flowers with two floral rings

bullet

calyx regular; NOT [calyx irregular, some sepals smaller than others]

bullet

sepals 4

bullet

corolla regular in shape; NOT [corolla irregular in shape]

bullet

each petal distinct from the others

bullet

petals 4; NOT [petals 5]

bullet

stamens 6, four long and two short

bullet

ovary superior; NOT [ovary inferior]

bullet

carpels 1 or 2; NOT [carpels 3-5]