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RANUNCULACEAE BUTTERCUP FAMILY

Margriet Wetherwax & Dieter H. Wilken, family description, key to genera

Annual, perennial herb, woody vine [shrub], occasionally aquatic. Leaf: generally basal and cauline, alternate or opposite, simple or compound; petioles at base generally flat, occasionally sheathing or stipule-like. Inflorescence: cyme, raceme, panicle, or flowers 1. Flower: generally bisexual, generally radial; sepals 3–6(20), free, early-deciduous or withering in fruit, generally green; petals 0–many, generally free; stamens generally 5–many, staminodes generally 0; pistils 1–many, ovary superior, chamber 1, style 0–1, generally ± persistent as beak, ovules 1–many. Fruit: achene, follicle, berry, ± utricle in Trautvetteria, in aggregate or not, 1–many-seeded.
± 60 genera, 1700 species: worldwide, especially northern temperate, tropical mountains; many ornamental (Adonis, Aquilegia, Clematis, Consolida, Delphinium, Helleborus, Nigella). some highly TOXIC (Aconitum, Actaea, Delphinium, Ranunculus). [Whittemore & Parfitt 1997 FNANM 3:85–271] Taxa of Isopyrum in TJM (1993) moved to Enemion; Kumlienia moved to Ranunculus. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Ranunculaceae

THALICTRUM MEADOW-RUE

Bruce D. Parfitt & Dieter H. Wilken

Perennial herb from caudex or rhizomes, generally glabrous; dioecious or flowers bisexual. Stem: 1–few, generally erect; branches 0 or few. Leaf: 1–4-ternate or pinnate, basal or basal and cauline, alternate, generally reduced distally on stem; leaflets wedge-shaped to ± round, entire, crenate, or lobed; pale green abaxially, generally green adaxially. Inflorescence: raceme or panicle, axillary or terminal, generally erect, ± scapose or not; bracts simple to 1-ternate; pedicels generally erect in fruit. Flower: sepals 4–5, ± green-white to ± purple, petal-like or not, generally early-deciduous; petals 0; stamens 8–many, generally > sepals, filaments flat or generally thread-like, anthers generally narrowly oblong, tip generally pointed; pistils (1)2–22. Fruit: achene, compressed laterally or not, ribbed or veined, beaked.
120–200 species: temperate North America, Eurasia, Africa; some ornamental, medicinal. (Greek: name given by Dioscorides, Greek physician-botanist) [Park & Festerling 1997 FNANM 3:258–271]

Key to Thalictrum

Previous taxon: Ranunculus uncinatus
Next taxon: Thalictrum alpinum

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 31 2014
Citation for this treatment: [Author of taxon treatment] 2013. Thalictrum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=10142, accessed on Oct 31 2014

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