Plant ID - Week 2 (Weeds) Flashcards
Creeping Buttercup
Ranunculus repens
Ranunculaceae
Herbaceous perennial weed
Very hardy Likes wet conditions
Leaf: Trifoliate (ternate)
Stolons
Morning Glory
Calystegia sepium
Convolvulaceae
Herbaceous perennial
Weed / Vine or climber - twines
Invasive plant - aggressive
Leaves heart-shaped - Ovate
Flowers large, white
Snapweed
Cardamine oligosperma
Brassicaceae
Annual Weed
Very Hardy
Basal leaves - Pinnately Compound
Flowers Small with 4 white petals (Raceme)
Fruit: Silique - Narrow exploding
Canda Thistle
Circium arvense
Asteraceae
Invasive plant, Weed / Noxious weed / Prickly
Very Hardy Herbaceous perennial
Leaves: Pinnate - Spines on margins (Oblong)
Flowers: Pink to Violet - small, narrow, upright petals
(Head)
Horsetail
Equisetum arvense
Equisetaceae
Herbaceous perennial Weed / Aggressive weed
Very hardy
Stems straight up
Leaves whorled, soft needle-like
Spores - cone-like structures at stem tip
Abrasive to touch
Euphorbia
Euphorbia cyparissias
Euphorbiaceae
Herbaceous perennial, Invasive plant
Hardy
Leaves: alternate, narrow (Linear)
Florets: lime green, umbel-lime clusters.
Poisonous parts
Japanese Knotweed
Fallopia japonica sachalinensis
Polygonaceae
Invasive plant - Shrub - deciduous,
Herbaceous perennial, Weed
Stems hollow, bamboo-like - Upright
Leaves - straight base (truncate)
Apex - abruptly pointed tip
Cleavers
Galium aparine
Rubiaceae
Annual, Vine or climber, Weed
Leaves on stem in whorls of 8,
Leaves linear to narrowly oblanceolate,
Bristly hairs
Giant Hogweed
Heracleum mantegazzianum
Apieaceae
Invasive plant, Biennial
Very hardy
Stems green - obvious purple blotches - stiff white hairs
Leaves deeply lobed, sharply toothed, serrated
Flowers: Compound Umbel - White
Poisonous sap
Orange Hawkweed
Hieracium aurantiacum
Asteraceae
Invasive plant / Herbaceous perennial
Very hardy
All parts with milky sap and wiry pubescence;
Leaves basal, elliptical to lanceolate
Flowering stem - 2-25 heads -
Corymb-like, Cyme
Flowers: truncate / notched /
Orange-red then drying to purple
Yellow Flag Iris
Iris pseudacorus
Iridaceae
Flowering cut plant, Ground cover, Herbaceous perennial, Invasive plant
Leaves: Grass-like - Linear
Flowers - 3 petal yellow
Fruit a large showy capsule.
Aquatic
Field Scabious
Knautia arvensis
Dipsacaceae
Very hardy
Herbaceous perennial, Invasive plant
Leaves oblanceolate with variable lobbing or teeth,
Flowers: Spikes - head-like, violet to blue to pinkish-purple.
Ox-eye Daisy
Leucanthemum vulgare
Asteraceae
Very hardy
Herbaceous perennial, Invasive plant
Stems fluted with reddish lines
Leaves: Narrow (Obovate)
Serrate / Basal
Inflorescence: Heads - white ray petals, disc florets bright yellow.
Himalayan blackberry
Rubus armeniacus
Rosaceae
Invasive plant / Vine or climber / Weed
Leaves compound (3-5 leaflets) prickles on midrib
Stems have large prickles;
Cyme of fragrant white florets
Fuit: an aggregate of drupelets, red then black
Broad-leaved Plantain
Plantago major
Plantaginaceae
Herbaceous perennial, Weed
Very Hardy
Leaves ovate, broad with prominemt parallel veins; Inflorescence: Spike of green spikelets
Fruit: Small light brown capsule.
Chickweed
Stellaria media
Caryophyllaceae
Annual Weed / Stolons
Not very hardy
Stems: single line of hairs / swollen leaf node
Flowers: white - five deeply notched petals
Spreading - Creeping / Mat-like
Common Tansy
Tanacetum vulgare
Asteraceae
Invasive plant, Annual
Stiffly upright / Very hardy
Leaves alternate, leaflets pinnate; stems narrow,
Inflorescence corymb of yellow, flat head, disk florets only
Dandelion
Taraxacum officinale
Asteraceae
Herbaceous perennial Weed
Very hardy / Milky sap
Leaves: narrow (Oblanceolate)
Margins: Dentate, Pinnately lobed
Flower: Large yellow head of ray and disc florets
Fruit: white, furry ball of seeds (achenes/ cypselas).
White Clover
Trifolium repens
Fabaceae
Herbaceous perennial
Low-growing
Leaves: Trifoliate
Inflorescence: oval-round, compact, head-like - white
