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Caulophyllum thalictroides

Caulophyllum thalictroides (L.) Michx.

 

Blue Cohosh

KingdomPlantaePlants, but not fungi, lichens, or algae (from Stearn’s Botanical Latin)
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassMagnoliidaeIncludes magnolias, nutmeg, bay laurel, cinnamon, avocado, black pepper, and many others
OrderRanunculalesBasal (evolved earlier) eudicots, also called “true dicots”
FamilyBerberidaceaeBarberry family
GenusCaulophyllumFrom Greek kaulos, “stem,” and phyllum, “leaf”
SpeciesthalictroidesSimilar to the Thalictrum genus

About plant names...

Blue cohosh is native to North America. What’s a cohosh? A native American word for rough—a reference to the bumpy roots. See also the unrelated plant black cohosh. Widely advertised for its ability to facilitate delivery, reduce symptoms of menstrual cramps, among other things, it contains a brew of chemicals that can poison or cause miscarriage.

Identification: Plants are up to 31" (80 cm) tall, with several bluish-green stems. Leaves are unusual in shape, with three (or four or five) points on the end, a little like duck feet. Each stem may have a single leaf, or a group of three, or even a group of three groups of three. Leaflets are up to 2" (5 cm) long. Flowers are in groups (panicles) up to 1½" (4 cm) around. Each flower is ½" (1.3 cm) around, yellow-green or brownish-green, with six sepals that look like flower petals. Inset within the apparent flower are six smaller real petals, each with a stamen. The fruits are the most obvious identifying feature: an attractive blue color like “blueberries covered in confectioner’s sugar.” They are ⅜-¾" (1-2 cm) in diameter, perfectly round, in clusters atop the plant.

Medical: Even today, midwives often use blue cohosh to help induce labor, reflecting a practice that dates back at least as far as Native American use. However, the article Safety and Efficacy of Blue Cohosh (Caulophyllum thalictrodes) During Pregnancy and Lactation summarizes:

Based on the available scientific information, blue cohosh should; 1) be used with extreme caution during pregnancy, 2) be used only under medical professional supervision and 3) not be available to the public as an over-the-counter product. There is an urgent need to conduct a retrospective or prospective cohort study of midwifes using blue cohosh in order to determine its safety.

Researchers reported many dangerous side effects. It is also dangerous when taken earlier in pregnancy, as it can cause miscarriage.

Edibility: Poisonous Skull & Crossbones Raw seeds and roots are poisonous. They may look tempting, but the berries are not edible.

Online References:

Caulophyllum thalictroides on Missouriplants.com

Caulophyllum thalictroides on academics.skidmore.edu

Caulophyllum thalictroides on the Connecticut Botanical Society's Connecticut wildflowers site

Caulophyllum thalictroides on Wildflowers of the United States

Caulophyllum thalictroides on eFloras

Caulophyllum thalictroides (Blue Cohosh)

9/14/2010 · Garden in the Woods, Framingham, MA
≈ 5 × 6" (13 × 15 cm)

Caulophyllum thalictroides (Blue Cohosh)

4/15/1979 · Memphis, TN · By Tim Chandler

Caulophyllum thalictroides (Blue Cohosh)

6/15/2010 · Garden in the Woods, Framingham, MA
≈ 17 × 12" (44 × 29 cm)

Caulophyllum thalictroides (Blue Cohosh)

5/15/2010 · Garden in the Woods, Framingham, MA
≈ 15 × 10" (39 × 26 cm)

Caulophyllum thalictroides (Blue Cohosh)

9/13/2015 · Beaver Brook Conservation Area, Hollis, NH
≈ 15 × 10" (37 × 25 cm)

Caulophyllum thalictroides (Blue Cohosh)

9/14/2010 · Garden in the Woods, Framingham, MA
≈ 3½ × 4½" (9.4 × 11 cm)

Caulophyllum thalictroides description by Thomas H. Kent, last updated 14 May 2016.

© FloraFinder.org. All rights reserved.


 

Caulophyllum thalictroides (Blue Cohosh)

8/22/2013 · Beaver Brook Assn Conservation Lands, Hollis, NH
≈ 7 × 6" (16 × 16 cm)

Caulophyllum thalictroides (Blue Cohosh)

6/15/2010 · Garden in the Woods, Framingham, MA
≈ 7 × 4½" (17 × 11 cm)

Caulophyllum thalictroides (Blue Cohosh)

8/22/2013 · Beaver Brook Assn Conservation Lands, Hollis, NH
≈ 7 × 11" (18 × 28 cm)

Caulophyllum thalictroides (Blue Cohosh)

9/14/2010 · Garden in the Woods, Framingham, MA
≈ 4 × 4½" (9.9 × 11 cm)

Caulophyllum thalictroides (Blue Cohosh)

8/22/2013 · Beaver Brook Assn Conservation Lands, Hollis, NH
≈ 4½ × 4½" (11 × 12 cm)

Caulophyllum thalictroides (Blue Cohosh)

5/15/2010 · Garden in the Woods, Framingham, MA
≈ 12 × 8" (31 × 20 cm)

Caulophyllum thalictroides (Blue Cohosh)

9/20/2014 · Garden in the Woods, Framingham, MA

Caulophyllum thalictroides (Blue Cohosh)

9/14/2010 · Garden in the Woods, Framingham, MA
≈ 15 × 10" (39 × 26 cm)

Caulophyllum thalictroides (Blue Cohosh)

9/13/2015 · Beaver Brook Conservation Area, Hollis, NH
≈ 9 × 6" (23 × 16 cm)

Range: Zones 3-8:

About this map...