Mulligan (Agriculture Canada, Ottawa, retired)
Ranunculus acris L., tall buttercup, renoncule âcre
Perennial, reproducing by seeds; mostly allogamous; stems 1.5 to
3 feet (45 cm. to 9 dm.) high; flowers yellow; throughout, but
most abundant in east; pastures, hayfields, roadsides and waste
places; introduced from Europe. Usually not grazed by livestock,
but if eaten poisoning can occur.
Ranunculus repens L., creeping buttercup, renoncule rampante
Perennial, with creeping shoots; frequently prostrate; flowers
yellow; throughout, except the mid-west; most common along the
east and west coasts; pastures, lawns, and waste places;
introduced from Europe.