pineapple-weed

(Matricaria discoidea)

Conservation Status
pineapple-weed
  IUCN Red List

not listed

     
  NatureServe

NNR - Unranked

SNA - Not applicable

     
  Minnesota

not listed

     
           
Wetland Indicator Status
     
  Great Plains

FACU - Facultative upland

     
  Midwest

FACU - Facultative upland

     
  Northcentral & Northeast

FACU - Facultative upland

     
           
 
Description
 
 

Pineapple-weed is a low, erect annual that rises on multiple stems from a branching taproot. The flowers and leaves, when crushed, smell of pineapple, giving this plant its common name.

The stems are erect or ascending, hairless, frequently-branched, and 1 to 18, but usually 8 to 12 tall.

The leaves are alternate, hairless, fern-like, ½ to 2 long, and up to ¾ inch wide. They are deeply cut into lobes that are spaced out along the midrib but not cut to the midrib; the lobes do not form separate leaflets (pinnatifid). The lobes may themselves be divided into lobes (bipinnatifid), which may be again divided into lobes (tripinnatifid).

The inflorescence is numerous flowers both in clusters and in leaf axils. A branched, elongated flower cluster forms at the end of some of the stem branches. Within each cluster the lower flower stalks are longer than the upper. Single flowers rise from upper leaf axils on ½ to 1½ long flower stalks.

The composite flower head is a wide disk of yellow or greenish-yellow flowers in an egg-shaped dome with no ray flowers. The latin name of this species, discoidea, means without rays. There are two rows of green, overlapping, semi-translucent bracts surrounding the flower head. At the base of the flower head the part of the stem on which the disk flowers are borne (the receptacle) is smooth, not bristly or chaffy.

The fruit is dry and seed-like, with no fluffy awns or bristles at the tip.

 
     
 

Height

 
 

1 to 18, usually 8 to 12

 
     
 

Flower Color

 
 

Yellow or greenish-yellow

 
     
 

Similar Species

 
 

Common tansy (Tanacetum vulgare) has a flat, wide, tightly-packed cluster of flower heads. Each flower head of common tansy is flat and topped with a brush of fine hair. The flower head of pineapple-weed is dome-shaped and smooth.

 
     
 
Habitat
 
 

Dry. Roadsides, sidewalks, and waste places. Full sun.

 
     
 
Biology
 
 

Flowering

 
 

May to September

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

2, 3, 4, 5, 7, 22.

 
  10/15/2019      
         
 

Nativity

 
 

Native to the cordilleran region of Alaska, western Canada, western United States, and northern Mexico. Widely naturalized.

 
         
 

Occurrence

 
 

Common

 
         
 
Taxonomy
 
  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Magnoliopsida (dicots)  
  Superorder Asteranae  
 

Order

Asterales (sunflowers, bellflowers, fanflowers, and allies)  
 

Family

Asteraceae (sunflowers, daisies, asters, and allies)  
  Subfamily Asteroideae  
  Supertribe Asterodae  
  Tribe Anthemideae (chamomiles, yarrows, and allies)  
  Subtribe Matricariinae  
  Genus Matricaria (mayweed)  
       
 

Synonyms

 
 

Artemisia matricarioides

Chamomilla discoidea

Chamomilla suaveolens

Lepidanthus suaveolens

Lepidotheca suaveolens

Matricaria matricarioides

Matricaria suaveolens

Santolina suaveolens

Tanacetum suaveolens

 
       
 

Common Names

 
 

disc mayweed

pineapple weed

pineappleweed

pineapple-weed

rayless dog-fennel

rounded chamomile

 
       

 

 

 

 

 

 

 

 

Glossary

Axil

The upper angle where the leaf stalk meets the stem.

 

Bipinnatifid

Twice pinnatifid. Cut deeply into lobes with each lobe also cut into deep lobes.

 

Bracts

Modified leaves at the base of a flower stalk or flower cluster.

 

Pinnatifid

Deeply cut, more than half way to the midrib but not to the midrib, into lobes that are spaced out along the midrib; the lobes do not form separate leaflets.

 

Receptacle

The part of a flower stalk on which the flower head is borne. In composite flowers, the part on which the flowers are borne.

 

Tripinnatifid

Three times pinnatifid.

       
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Plant

  pineapple-weed    
       

Inflorescence

  pineapple-weed    
       
       

 

Camera

     
Slideshows
   
  Matricaria discoidea
Susanne Wiik
 
  Matricaria discoidea  
 
About

Tunbalderbrå, pineappleweed

 
     
  Pineapple weed
Wez Smith
 
  Pineapple weed  
 
About

Pineapple weed (Matricaria discoidea).

 
     
  Matricaria discoides (Pineapple Weed)
Allen Chartier
 
  Matricaria discoides (Pineapple Weed)  

 

slideshow

       
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Other Videos
 
  Pineapple Weed: Wild Chamomile
kldhf524
 
   
 
About

Uploaded on Jul 3, 2008

http://www.learningherbs.com/ Pineapple weed is an excellent herb for stress. It is also a pink eye remedy, stuffy nose remedy, stomach ache remedy, colic remedy, flatulence remedy, as well as itchy skin remedy. Along with wild chamomile, pineapple weed is one of the herbs for stress.

   
       
  Matricaria discoidea
wetvideocamera
 
   
 
About

Published on Jun 29, 2014

Pineapple Weed - A member of the Asteraceae Family. Low-growing in compacted soils. When the flowers are crushed the aroma of pineapple is evident.

   
       

 

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