Basal leaves
Basal leaves in rosette; pinnately compound; basal long-petiolate; blades cordate, pubescent, and 3-lobed; margins crenate-dentate to crenate-lobulate; leaflet bases are truncate to cordate; apex rounded to obtuse.
Cauline leaves
Cauline leaves alternate, the bracts of about 3 linear divisions, sessile; pinnately compound; blades cordate and 3-lobed; leaflet base truncate to cordate; apex rounded to obtuse.
Ecology
Thrives in moist areas and waste places such as roadsides, fields, open woods, etc.
Family
RANUNCULACEAE Jussieu (Crowfoot Family or Buttercup Family)
Flowering period
Mostly late winter through the summer; March through August.
Flowers
Pedicellate flowers; peduncle furrowed; pedicals 3-5 cm long in flower, 2-6 cm long in fruit, thinly appressed-hairy; sepals 5, greenish-yellow, reflexed, 3-6 mm long and 1.5-2 mm broad, pilose, promptly decidous; petals 5, yellow, 8-9 mm long, 5-7 mm broad, the truncate nectary scale glabrous and free laterally; receptacle hairy with small and numerous carpels; stamens 25 to 50.
Fruit
Achenes 1.5-2 mm broad; 12-35 per head; globose or ovoid head, 4-6 mm long and 5-8 mm wide; smooth, beak upward curving and is 0.3 - 0.7 mm.
Habit and stem features
Annual; stem is erect, 1.5-6.5 dm tall, not rooting, branching freely, not fistulous, hirsute; pubescent with long hairs.
Place of Species Publication
Stirpium Austriarum: fasciculus 2 1763 (APNI)
References
Correll, D.S. and M.C. Johnston. 1970. Manual of the Vascular Plants of
Flora of
HYPPA. 2000. Hypermedia for Plant Protection (Weeds). http://www.dijon.inra.fr/malherbo/hyppa/hyppa-a/hyppa_a.htm.
IPNI. 2004. The International Plant Names Index. http://www.ipni.org/index.html.
Kartesz, J.T. 1994. A Synonymized Checklist of the Vascular Flora of the United States, Canada, and Greenland, Second edition, Volume I-checklist.
Radford, A.E., H.E. Ahles, and C.R. Bell. 1968. Manual of the Vascular Flora of the
USDA, NRCS. 2005. The PLANTS Database. http://www.plants.usda.gov.
Synonyms
Ranunculus parvulus L.