Alberta Invasive Plant Identification Guide

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Knapweed, Spotted Centaurea stoebe, Asteraceae (Sunflower Family) Category: Prohibited Noxious • Information: Introduced from Europe, covers vast areas of land in Canada and in the USA, found in disturbed areas, is allelopathic (toxic to- wards other plants). • Life cycle: Biennial or short-lived perennial. • Root: Taproot. •Leaves: Rosette leaves are deeply lobed, grayish green, and up to 15cm long. Stem leaves finely divided into linear segments. • Stems: Up to 120cm tall and highly branched. • Flower: One pinkish-purple flower head on each branch. Bracts have dark spot on tip and fringed edges. • Seed/Fruit: Black seeds 2mm long. Prolific seed producer. • Control: Long term, hand pick in rosette stage, chemical control before seed has set. Sarah Schumacher, Wheatland County Sarah Schumacher, Wheatland County 34 Montana State University Invasive Plant Identification Guide Montana State University Invasive Plant Identification Guide
knapweed, Squarrose Centaurea virgata, Asteraceae (Sunflower Family) Category: Prohibited Noxious • Information: Introduced from Eastern Mediterranean/Asia, looks similar to Diffuse Knapweed in growth form but has pink flowers. Weed of range and pasture, open habitats. • Life Cycle: Perennial. • Root: Taproot. • Leaves: Rosette leaves in first years growth, deeply divide leaves on the lower portion of the plant, bract-like leaves on the top, green-grey in color. • Stems: 30-50cm tall, highly branched. • Flower: Pink flowers, smaller than the other pink knapweeds, bracts below the flowers. • Seed/Fruits: Reproduces by seed, remains viable for many years. • Toxicity: • Control: Early detection, grazing. 35
Page 1 and 2: Alberta Invasive Plant Identificati
Page 3 and 4: Alberta Invasive Plant Identificati
Page 5 and 6: Alberta Weed Control Act Legislatio
Page 7 and 8: White Flowers Scentless Chamomile P
Page 9 and 10: Yellow Flowers Hawkweed spp. Pg. 24
Page 11 and 12: Prohibited Noxious Weeds Prohibited
Page 13 and 14: Balsam, Himalayan Impatiens glandul
Page 15 and 16: http://commons.wikimedia.org/wiki/F
Page 17 and 18: Montana State University Invasive P
Page 21 and 22: Flowering Rush Butomus umbellatus,
Page 23 and 24: USDA APHIS PPQ Archive, USDA APHIS
Page 25 and 26: Michael Shephard, USDA Forest Servi
Page 27 and 28: Donna R. Ellis, University of Conne
Page 29 and 30: Knapweed, Bighead Centaurea macroce
Page 33: Montana State University Invasive P
Page 37 and 38: Knotweed Complex Fallopia spp./ Pol
Page 39 and 40: Steve Dewey, Utah State University,
Page 41 and 42: Puncturevine Tribulus terrestris, Z
Page 43 and 44: Rush Skeletonweed Chondrilla juncea
Page 45 and 46: Saltlover Halogeton glomeratus, Che
Page 47 and 48: Starthistle, Yellow Centaurea solst
Page 49 and 50: Thistle, Nodding Carduus nutans, As
Page 51 and 52: Noxious Weeds Noxious Weeds have th
Page 53 and 54: Bellflower, Creeping Campanula rapu
Page 55 and 56: Blueweed Echium vulgare, Boraginace
Page 57 and 58: Brome, Japanese Bromus japonicas, P
Page 59 and 60: Buttercup, Tall Ranunculus acris, R
Page 61 and 62: Clematis, Yellow Clematis tangutica
Page 63 and 64: Oxeye Daisy Leucanthemum vulgare, A
Page 65 and 66: Henbane, Black Hyoscyamus niger, So
Page 67 and 68: Hound’s‑Tongue Cynoglossum offi
Page 69 and 70: Life cycle: Perennial. Root: Deep
Page 71 and 72: Sow thistle, Perennial Sonchus arve
Page 73 and 74: Tansy, Common Tanacetum vulgare, As
Page 75 and 76: Toadflax, Dalmatian Linaria dalmati
Page 77 and 78: Glossary adventitious roots Roots a
Page 79 and 80: Weed Websites Alberta Invasive Plan
Page 81: Produced by Wheatland County For mo

Alberta Invasive Plant Identification Guide

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