Weeds Lab 9/13

Question 1

Answer 1

Prostrate pigweed
Amaranthaceae
A
Sd

Stems fleshy and pliable. Leaves oblong to obovate or oval but broader at the notched tip than the petiole. Margins entire

Question 2

Answer 2

Wild carrot
Apiaceae
B, SP
Sd

leaf margins are hairy, triangular to oblong, twice pinnately compound

Question 3

Answer 3

Common milkweed
Asclepiadaceae
CP
Sd,Rz

milky sap

Leaves opposite, oblong-elliptic to oval, white midvein, margins are entire

Question 4

Answer 4

Horseweed
Asteraceae
A
Sd

stems bistly hairywith many small flowering branches. Leaves hairy alternate and crowded along the stem and become smaller up the stem. Leaf margins entire or toothed

Question 5

Answer 5

Mugwort
Asteraceae
CP
Rhz., Sd

leaves are simple and alternate with large pinnatified lobes. Undersides covered with whiteto gray wooly hairs.

Question 6

Answer 6

Field bindweed
Convolvulaceae
CP
CrpRoot, Sd

Leaves: Alternate, occur on petioles, and are triangular in outline. Leaves can occur either without hairs (glabrous) or can have hairs. The leaf bases are pointed and have lobes that point outward.

Question 7

Answer 7

Hedge bindweed
Convolvulaceae
CP
CrpRoot, Sd

Leaf bases are cut squarely (truncate)

Question 8

Answer 8

Field Horsetail
Equisetaceae
CP
Rz, Spores

Stems are green, hollow, and grooved. Branches grow in whorls from the middle and upper nodes.

Question 9

Answer 9

Black medic
Fabaceae
A
Sd

Leaves compound with 3 wedge shaped leaflets

Center leaflet has a longer stalk (petiolule) than the laterl leaflets.

Question 10

Answer 10

White clover
Fabaceae
CP
Sd, Stn

Stems prostrate and rooting at nodes

Leaves widest at apex, broadly elliptic to egg shaped

Question 11

Answer 11

Ground ivy or Creeping Charlie
Lamiaceae
CP
Creeping stems, Sd

Stems are lax, square. Leaves are opposite, shiny on upper surface, kidney-shaped or heart-shaped, with broad rounded teeth on the margin.

Question 12

Answer 12

Common Mallow
Malvaceae
A,B
Sd

Leaves are alternate, circular to kidney shaped, with toothed margins.

Question 13

Answer 13

Velvetleaf
Malvaceae
A
Sd

Stems are erect, mostly unbranched and have short velvety branched hairs. Leaves heart shaped, soft and hair

Question 14

Answer 14

Broadleaf plantain
Plantaginaceae
SP
Sd

Leaves are smooth or small hairs, elliptic to oval. Abruptly narrow to a well-defined petiole.

Question 15

Answer 15

Buckhorn or Narrowleaf plantain
Plantaginaceae
SP
Sd

leaves are narrow lanceolate to elliptic, widest above the middle. Can have longsilky hairs at the base.

Question 16

Answer 16

Quackgrass
Poaceae
CP
Rz, Sd

Seed head is a long spike

Ligule is membranous and very short. Blades are hairy to smooth. Sheaths are rounded and smooth. Auricles are narrow, slender, and clasp the stem.

Question 17

Answer 17

Wild buckwheat
Polygonaceae
A
Sd

Leaves are alternate, triangular to heart shaped with the basal lobes pointing inward toward the petiole. Upper leaves are more lanceolate. Margins are entire.

An Ocrea encircles the stem at the base of the petiole.

Question 18

Answer 18

Yellow toadflax
Scrophulariaceae
CP
Sd, CR

Stems are erect, smooth, mostly unbranched, very leafy. Leavs are alternate, pale green to gray-green, linear, and narrow at the base with entire margin.

Question 19

Answer 19

Bittersweet nightshade
Solanaceae
P vine
Sd, Creeping stems

Leaves are petiolated alternate and have two forms. One has 2 basal lobes, the other is ovate to oval. Smooth margins.

Foliage tinged purple and unpleasant odor.

Question 20

Answer 20

Groundcherry
Solanaceae
A
Sd

Leaves are alternate, ovate to lanceolate, pointed tip. Margins are entire or with a few small time. Woody with age.