Lab 3: Keying out species

Question 1

Trillium erectum habitat

Answer 1

floodplain (river/stream), forests, rocky slopes

Question 2

Trillium erectum leaf information

Answer 2

arrangement: whorled (3 or more leaves per node along stem)

blade shape: ovate and rhombic

blade length: 50-200 mm

Question 3

Trillium erectum perianth and ovary information

Answer 3

flower petal colour: dark purple

perianth parts are separate

Inflorescence only have 1 flower on it

Superior ovary

Fruit is a berry (fleshy), length of 10-16 mm

Question 4

Iris pseudacaris

Answer 4

flowers have 3 sepals, 3 petals, 3 stamens, 3 connate carpels

Inferior ovary

Plants have stems; sepals do not have ridges, and sepals have some small hairs at their base only

Question 5

Mentha canadensis stems

Answer 5

Perennial, herbaceous plant about 30 cm tall

Stems square in cross section, pubescent

Question 6

Mentha canadensis flowers

Answer 6

flowers in verticils, internode length roughly equal in flower bearing and non-flower bearing nodes

calyx pubescent, synsepalous, almost actinomorophic, 10-13 nerved, no protuberances

Corolla sympetalous, 4-lobed, top lobe with a small cleft, corolla tube short

Stamens 4, clearly visible at anthesis (flowering time)

Gynoecium of 2 fused carpels, ovary 4-lobed, gynobasic style attachment, superior ovary

Question 7

Mentha canadensis leaves

Answer 7

leaves, short petiolate, serrate (toothed), acuminate, glabrous or hairy, 2-8 cm long