Flourensia cernua Dc.
Family: Asteraceae
American tarwort,  more...
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Liz Makings  
Shrubs to 100(-200) cm. Leaf blades elliptic to ovate, 10-25(-40+) × 4-15(-20) mm (margins sometimes undulate). Ray florets 0. Disc florets 10-25(-40); corollas 3-4 mm. Cypselae 4-6.5 mm; pappi 2.5-3.5 mm. 2n = 36. Flowering mostly Sep-Nov. Limestone or alkaline or clay soils, gravelly sites, desert scrub; 800-2000+ m; Ariz., N.Mex., Tex.; Mexico. Plants of Flourensia cernua usually have a tarry odor and are often locally co-dominant with Larrea tridentata throughout much of the Chihuahuan Desert.

FNA 2006, Powell 1998
Common Name: American tarwort Duration: Perennial Nativity: Native Lifeform: Shrub General: Shrub 1-2 m tall, densely leafy. Leaves: Alternate, blades elliptic to ovate, 10-25 mm by 4-15 mm, pointed, margins sometimes undulate. Flowers: Heads 1 cm long, nodding, sessile or on short stalks, no ray flowers, disk flowers perfect 10-25, corollas 3-4 mm, yellow; involucre bellshaped, strongly overlapping phyllaries, in 3 series; glutinous herbage, tips spreading, chaffy receptacle. Fruits: Cypselae flattened, hairy, 4-6.5 mm, pappus of unequal awns, 2.5-3.5 mm, these fringed. Ecology: Found in desert flats, often co-dominant with creosote from 2,500-6,500 ft (762-1981 m); flowers September-December. Distribution: se AZ, s NM, sw TX; south to c MEX. Notes: Often found co-dominant with Larrea tridentata throughout the Chihuahuan desert. Distinguished by being a medium-sized, much-branched shrub with sticky-resinous foliage; oval to elliptic leaves; and small nodding heads with herbaceous pappus, all disk flowers and a pappus of two awns. Ethnobotany: Used as a treatment for indigestion and other stomach ailments. Etymology: Flourensia is named for Marie-Jean-Pierre Flourens (1794-1867) a French physiologist, while cernua means drooping or nodding. Synonyms: None Editor: SBuckley 2010, FSCoburn 2015
Flourensia cernua image
Liz Makings  
Flourensia cernua image
Liz Makings  
Flourensia cernua image
Liz Makings  
Flourensia cernua image
Liz Makings  
Flourensia cernua image
Patrick Alexander  
Flourensia cernua image
Patrick Alexander  
Flourensia cernua image
Patrick Alexander  
Flourensia cernua image
Patrick Alexander  
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Liz Makings  
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Liz Makings  
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