yellow star grass

(Hypoxis hirsuta)

Conservation Status
yellow star grass
 
  IUCN Red List

not listed

     
  NatureServe

N5 - Secure

SNR - Unranked

     
  Minnesota

not listed

     
           
Wetland Indicator Status
     
  Great Plains

FACW - Facultative wetland

     
  Midwest

FAC - Facultative

     
  Northcentral & Northeast

FAC - Facultative

     
           
 
Description
 
 

Yellow star grass is a 4 to 12 tall, erect, perennial forb that is easy to overlook if not in bloom. There is no above-ground central stem. A whorl of leaves and a flowering stalk rise from a small, solid, vertical, thickened, underground stem (corm).

The 3 to 6 grass-like leaves are linear, up to 1 long and ½ wide, and have scattered long, soft, straight hairs.

One or more leafless stalks (scapes) support irregular, umbrella-like inflorescences (umbels) of 2 to 6 flowers each, with the flower stalks arising from more or less the same point. The scape also has scattered hairs and is shorter than the leaves. It can be up to 8 in height, but is rarely more than 6.

The star-like flowers are ½ to 1 across and have 6 tepals that spread outward. The tepals are 3 petals and 3 sepals. The underside of the sepals and the flower stems are densely hairy. There are usually only one or two flowers open at a time. The flowers open in the morning then melt in the midday sun.

 
     
 

Height

 
 

4 to 12

 
     
 

Flower Color

 
 

Yellow

 
     
 

Similar Species

 
  There are no similar species in the state. The six petals and hairy stems of this plant are distinctive.  
     
 
Habitat
 
 

Wet to dry. Open woods, prairies. Full or partial sun.

 
     
 
Biology
 
 

Flowering

 
 

April to July

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

2, 3, 4, 5, 7, 24, 28.

 
  7/9/2015      
         
 

Nativity

 
 

Native

 
         
 

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 Liliopsida (monocots)  
 

Order

Asparagales (agaves, orchids, irises, and allies)  
 

Family

Hypoxidaceae (stargrasses and allies)  
 

Genus

Hypoxis (star grass)  
       
 

There are an estimated 90, 100, or 150 species in the genus Hypoxis, depending on the source. Yellow star grass is the only Hypoxis species found in Minnesota.

 
       
 

Synonyms

 
 

Hypoxis carolinensis

Hypoxis decumbens

Hypoxis erecta

Hypoxis graminea
Hypoxis grandis

Hypoxis micrantha

Hypoxis pallida

Ornithogalum hirsutum

 
       
 

Common Names

 
 

common goldstar

common star-grass

eastern yellow star-grass

hairy stargrass

yellow star grass

 
       
 

Contrary to its common name, yellow star grass is not a grass.

 
       

 

 

 

 

 

 

 

 

Glossary

Corm

A short, solid, vertical, thickened, underground stem that serves as a storage organ.

 

Scape

An erect, leafless stalk growing from the rootstock and supporting a flower or a flower cluster.

 

Tepal

Refers to both the petals and the sepals of a flower when they are similar in appearance and difficult to tell apart. Tepals are common in lilies and tulips.

 

Umbel

A flat-topped or convex umbrella-shaped cluster of flowers or buds arising from more or less a single point.

       
Visitor Photos
   

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Crystal Boyd
       
  yellow star grass    
       
MinnesotaSeasons.com Photos
   

Plant

  yellow star grass    
       

Flower

  yellow star grass    
       
       

 

Camera

     
Slideshows
   
  Hypoxis hirsuta
Zi W
 
  Hypoxis hirsuta  
     
  Hypoxis hirsuta (Star-grass)
Allen Chartier
 
  Hypoxis hirsuta (Star-grass)  
     
  Hypoxis hirsuta GOLDEN STARGRASS
Frank Mayfield
 
  Hypoxis hirsuta GOLDEN STARGRASS  

 

slideshow

       
Visitor Videos
       

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Other Videos
 
  Yellow Star Grass and Missouri Native Bee Interaction
Retha Meier
 
   
 
About

Published on May 15, 2013

Observe the native bee interacting with the anthers of yellow star grass.

   
       
  Missouri Native Bee and Yellow Star Grass
Retha Meier
 
   
 
About

Published on May 26, 2013

This native bee is foraging on yellow star grass. This video was recorded during May, 2013, at Cuivre River State Park in Missouri.

   
       

 

Camcorder

         
Visitor Sightings
   

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Crystal Boyd
5/29/2013

Location: Minnesota Valley National Wildlife Refuge, Black Dog Preserve Unit

yellow star grass


David Ayer
6/23/2012

Location: Joseph A. Tauer Prairie SNA


     
     
 
MinnesotaSeasons.com Sightings
         

 

 

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