Directory       News       Site Map       Home
         
    Jepson eFlora
Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

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

1. Plant 5–15(20) cm; leaves basal (1 cauline), 1.5–6 cm; inflorescence raceme; pedicel recurved in fruit ..... T. alpinum

1' Plant 40–200 cm; leaves basal and cauline, 4–46 cm; inflorescence generally panicle; pedicel ± erect in fruit

2. Flowers bisexual; filaments flat; anthers obtuse to mucronate; fruit body sides generally semicircular to crescent-shaped, beak 1–1.5 mm ..... T. sparsiflorum

2' Flowers unisexual; filaments thread-like; anthers acuminate; fruit body sides obliquely narrowly ovate to fusiform or widely obovate to ± round, beak 1.5–4.5 mm

3. Fruit generally reflexed, ribs ± straight; n North Coast, nw Klamath Ranges ..... T. occidentale

3' Fruit spreading to ascending, ribs ± curved; n North Coast, nw Klamath Ranges, and elsewhere ..... T. fendleri

4. Fruit body ± compressed throughout, sides obliquely ± ovate to ± obovate, 2–3-ribbed, veins 0; distal leaves abaxially generally finely glandular-puberulent (at 20×) ..... var. fendleri

4' Fruit body compressed generally only near margins, sides obliquely ± widely obovate to ± round, generally 1-ribbed, veins several, wavy, net-like; distal leaves abaxially generally glabrous ..... var. polycarpum

Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.