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Ranunculus sardous is often confused with:
Ranunculus carolinianus Flower
Native alternative(s) for Ranunculus sardous:
Oenothera speciosa Close up of flower
Plants that fill a similar niche:
Oxalis stricta Oxalis stricta habit
Nandina domestica Growing Form
Melia azedarach close up of flowers
Ranunculus sardous has some other problems:
Hairy Buttercup

Ranunculus sardous

Phonetic Spelling
ra-NUN-ku-lus sar-DOH-us
This plant has low severity poison characteristics.
See below
Description

Hairy buttercup is a weed in the Ranunculaceae (buttercup) family native to the Canary Islands, North Africa, and Europe.  This broadleaf, winter annual germinates in the fall or winter and remains dormant until spring.  However warm weather in winter may trigger growth.   It thrives in disturbed areas, particularly in moist ones and has dense fibrous roots. 

It has ascending to erect form and very hairy leaves and stems, hence the common name.  It matures and produces seed in the spring dying back in late spring or early summer. It can quickly out compete weak turf, particularly where the soil is moist or in shade.

The yellow, five petaled, flowers have five reflexed sepals. Each petal is usually less than a third of an inch long. The petioles are often over an inch long attaching the hairy stem to the hairy leaves which are usually divided into three leaflets.  The achene fruits grow in clusters of up to 35.

Healthy turf is the best way to prevent winter annual weeds. Select a variety adapted to your area and fertilize, mow, and water at recommended rates. The low, broad growth habit is not hampered by mowing so weed management strategies may be needed.  

See this plant in the following landscape:
Cultivars / Varieties:
Tags:
#weeds#yellow flowers#winter annual weed#high maintenance#fast growing#disturbed areas#hairy leaves#hairy stems#problem for cats#problem for dogs#problem for horses
 
Cultivars / Varieties:
Tags:
#weeds#yellow flowers#winter annual weed#high maintenance#fast growing#disturbed areas#hairy leaves#hairy stems#problem for cats#problem for dogs#problem for horses
  • Attributes:
    Genus:
    Ranunculus
    Species:
    sardous
    Family:
    Ranunculaceae
    Life Cycle:
    Annual
    Biennial
    Country Or Region Of Origin:
    Eurasia
    Dimensions:
    Height: 0 ft. 1 in. - 3 ft. 0 in.
    Width: 0 ft. 3 in. - 0 ft. 8 in.
  • Whole Plant Traits:
    Plant Type:
    Weed
    Habit/Form:
    Ascending
    Erect
    Growth Rate:
    Rapid
    Maintenance:
    High
  • Cultural Conditions:
    Available Space To Plant:
    Less than 12 inches
  • Fruit:
    Fruit Color:
    Green
    Fruit Type:
    Achene
    Fruit Length:
    < 1 inch
    Fruit Width:
    < 1 inch
    Fruit Description:
    Heads of achenes, green when unripe sparsely hairy. Does not split open when ripe 2-3 mm long.
  • Flowers:
    Flower Color:
    Gold/Yellow
    Flower Inflorescence:
    Panicle
    Flower Bloom Time:
    Spring
    Summer
    Flower Shape:
    Cup
    Flower Petals:
    4-5 petals/rays
    Flower Size:
    < 1 inch
    Flower Description:
    Blooms from April- June. Radially symmetrical cup shaped glossy yellow flowers with 5 petals in open panicles. Yellow sepals reflexed
  • Leaves:
    Leaf Color:
    Green
    Leaf Type:
    Compound (Pinnately , Bipinnately, Palmately)
    Leaf Arrangement:
    Alternate
    Leaf Margin:
    Dentate
    Lobed
    Hairs Present:
    Yes
    Leaf Description:
    Palmately compund or three lobed basal, alternate, coarsely toothed margins
  • Stem:
    Stem Color:
    Brown/Copper
    Green
    Red/Burgundy
    Stem Is Aromatic:
    No
    Stem Surface:
    Hairy (pubescent)
    Stem Description:
    Hairy gren red brown stems
  • Landscape:
    Problems:
    Poisonous to Humans
    Problem for Cats
    Problem for Dogs
    Problem for Horses
  • Poisonous to Humans:
    Poison Severity:
    Low
    Poison Symptoms:
    Vomiting, diarrhea, depression, anorexia, hypersalivation, oral ulcers and wobbly gait
    Poison Toxic Principle:
    Protoanemonin (an irritant)
    Causes Contact Dermatitis:
    No