white vervain

(Verbena urticifolia var. urticifolia)

Conservation Status
white vervain (var. urticifolia)
 
  IUCN Red List

not listed

     
  NatureServe

NNR - Unranked

SNR - Unranked

     
  Minnesota

not listed

     
           
Wetland Indicator Status
     
  Great Plains

FAC - Facultative

     
  Midwest

FAC - Facultative

     
  Northcentral & Northeast

FAC - Facultative

     
           
 
Description
 
 

White vervain (var. urticifolia) is an annual, biennial, or short-lived perennial forb. It rises on a single stem.

The stems are erect, slender, 20 to 60 tall, moderately to strongly four-angled, and usually branched near the base. They are moderately to densely covered with spreading, straight or somewhat curved hairs.

The leaves are opposite and broadly lance-shaped to oblong egg-shaped. They are mostly2 to 4¾ long and ¾ to 2¾ wide, but larger leaves may be up to 8 long and 4¾ wide. They are on ½ to 2 long leaf stalks (petioles) that are usually winged above the middle. The blades are unlobed, rounded or short tapered at the base, and tapered to a sharp point at the tip. They do not clasp the stem. The lower surface is hairless or moderately covered with whitish, 132 to 1 16long, coarse, stiff hairs. The margins are somewhat coarsely and sometimes doubly toothed.

The inflorescence is a very loosely spreading branched cluster (panicle) of several to numerous spikes at the end of the stem and additional smaller panicles or spikes rising from the upper leaf axils. The spikes are slender, usually stiffly ascending, and 3 to 20 long. At first they are relatively short and crowded with buds. As the flowers bloom from the base toward the tip the spike becomes greatly elongated. Only a few flowers on each spike are in bloom at any one time. The blooming flowers do not overlap.

The flowers are about wide. There are 5 sepals, 5 petals, 4 stamens, and 1 style. The sepals are green, and are united at the base into a narrowly bell-shaped tube (calyx), then separated into 5 short teeth that are unequal in length. The calyx is 1 32 to 1 16 long when in flower, elongating to about 3 16 long in fruit. It is covered with short, sharp, stiff, appressed hairs. The modified leaves (bracts) at the base of each flower are egg-shaped to narrowly egg-shaped and 164 to 1 16long. They are shorter than the calyx. The petals are white and 1 16 to long. They are fused at the base into a slender, funnel-shaped tube then separated into 5 blunt, broadly triangular limbs.

Each flower produces a cluster of 4 nutlets that are enclosed in the persistent calyx but are exposed at the tip. Each nutlet is narrowly ellipse-shaped, 5 64 long, and corrugated or ribbed on the back.

 
     
 

Height

 
 

20 to 60

 
     
 

Flower Color

 
 

White

 
     
 

Similar Species

 
  White vervain (Verbena urticifolia var. leiocarpa) leaf underside is densely velvety, covered with 164 long hairs. The calyx is covered with soft, minute hairs that are barely visible without magnification. The nutlet is slightly shorter and smooth on the back.  
     
 
Habitat
 
 

Moist to moderately moist. Woodland borders and openings, thickets, power lines, trails, disturbed sites. Partial sun.

 
     
 
Biology
 
 

Flowering

 
 

June to October

 
     
 
Use
 
 

White vervain is difficult to photograph in its entirety. The flower spikes spread widely in all directions and the individual flowers are tiny. The inflorescence tends to get lost against the background and most of it is inevitably out of focus.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7.

 
  11/21/2014      
         
 

Nativity

 
 

Native

 
  Common      
 

Occurrence

 
 

 

 
         
 
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 (flowering plants)  
  Superorder Asteranae  
 

Order

Lamiales (mints, plantains, olives, and allies)  
 

Family

Verbenaceae (verbena)  
  Tribe Verbeneae  
  Genus Verbena (vervain)  
  Section Verbena  
  Series Leptostachyae  
  Species Verbena urticifolia (white vervain)  
       
 

Synonyms

 
 

Verbena urticifolia var. incarnata

Verbena urticifolia var. simplex

 
       
 

Common Names

 
 

burvine

nettle-leaf vervain

white verbena

white vervain

 
       

 

 

 

 

 

 

 

 

Glossary

Axil

The upper angle where a branch, stem, leaf stalk, or vein diverges.

 

Calyx

The group of outer floral leaves (sepals) below the petals, occasionally forming a tube.

 

Panicle

A pyramidal inflorescence with a main stem and branches. Flowers on the lower, longer branches mature earlier than those on the shorter, upper ones.

 

Petiole

On plants: The stalk of a leaf blade or a compound leaf that attaches it to the stem. On ants and wasps: The constricted first one or two segments of the rear part of the body.

 

Sepal

An outer floral leaf, usually green but sometimes colored, at the base of a flower.

       
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Plant

  white vervain (var. urticifolia)    
       

Leaves

  white vervain (var. urticifolia)    
       
       

 

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