Lab 7 - Prohibited, Noxious, and Nuisance Weeds

Question 1

identifying characteristics of mature common crupina

Answer 1

• bottom rosette leaves are entire, top are finely lobed
• older leaves have short, stiff spines on margin
• long, narrow lavender-purple flowers in a capitulum

Question 2

identifying characteristics of seedling common crupina

Answer 2

oblong, fleshy cotyledons with distinct purple-red vein

Question 3

identifying characteristics of mature yellow starthistle

Answer 3

• basal rosette with deeply lobed and pointed leaves (looks like dandelion)
• entire upper leaves
• winged stem margin covered in coarse, cottony hair
• large spines on flower to give star appearance

Question 4

identifying characteristics of mature dalmatian toadflax

Answer 4

• heart-shaped, glabrous leaves with waxy bloom
• alternate, sessile leaves
• flowers similar to toadflax but bigger

Question 5

identifying characteristics of mature jointed goatgrass

Answer 5

• short, membranous ligule
• short auricle
• spikelets attached at joints

Question 6

identifying characteristics of mature saltcedar

Answer 6

• woody shrub
• small, white-pink flowers in finger-like clusters
• scale-like, overlapping leaves
• reddish brown bark

Question 7

identifying characteristics of mature leafy spurge

Answer 7

• latex in stem
• lots of leaves alternate on stem
• linear, sessile or short petiolate leaves
• umbel-like race with leaf-like yellow-green bracts

Question 8

identifying characteristics of mature yellow toadflax

Answer 8

-erect stem
- alternate, sessile , linear leaves
- orange-yellow flowers with distinct basal spur in a raceme (look like snapdragons)
- looks similar to leafy spurge