dwarf false indigo

(Amorpha nana)

               
Conservation Status

IUCN Red List

not yet assessed

dwarf false indigo

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

UPL - Obligate upland

Midwest

FACU - Facultative upland

Northcentral & Northeast

FACU - Facultative upland

Nativity

Native

Occurrence

Uncommon

Habitat

Moist. Prairies. Full sun.

Flowering

Early June to late July

     
Flower Color

Violet to purple

     
Height

12 to 40

     

Identification

This is an erect, compact, bushy, perennial shrub that rises on one or a few stems from a woody root crown. It is usually 12 to 24tall, though tall individuals may reach 40 in height. It reproduces by suckers.

The bark is gray to brown and more or less smooth.

First-year twigs are sparsely hairy to almost hairless. Second-year twigs are hairless.

The leaves are alternate, deciduous, and 13 16 to 3½ long. They are pinnately divided into 9 to 27 leaflets. They are on to 5 16 long, sparsely hairy leaf stalks.

The leaflets are oblong to elliptical or inversely egg-shaped, ¼ to long , and to 3 16 wide. They are rounded or tapered at the base and blunt to rounded at the tip. The leaf tip is sometimes notched and has a short, sharp, abrupt point. The upper surface is dark green and hairless. The lower surface is pale green and is usually hairy along the midvein and at the margins. The underside is also conspicuously dotted with sunken glands. The margins are untoothed.

The inflorescence is a single, erect, spike-like raceme at the end of the stem and branches. The racemes are erect, densely flowered, 13 16 to 3 long, and to wide.

The individual flowers are on 1 32 to 1 16 long, moderately to densely hairy stalks. There are 5 green sepals fused for most of their length into a bell-shaped, long tube (calyx), then separated into 5 narrowly triangular lobes. The calyx lobes are at least half as long as the calyx tube. The corolla is a single 3 16 to ¼ long, violet to purple petal. The petal is tubular near the base, unfolded near the tip to form a protective covering over the stamens and pistil. There are 10 stamens with purple filaments united near the base and yellow to orange anthers protruding well beyond the corolla.

The fruit is a brown, hairless, to 3 16 long pod with a single seed. The pod matures late July to mid-September.

 
Similar
Species

 


Distribution Distribution Map   Sources: 2, 3, 4, 5, 7, 8, 28.

Comments

 


Taxonomy

Family:

Fabaceae (pea)

 

Subfamily:

Faboideae (Papilionoideae)

 

Tribe:

Amorpheae

 
Synonyms

 

 
Common
Names

dwarf false indigo

dwarf indigo

dwarf indigobush

fragrant false indigo


 

 

 

 

 

 

 

 

 

Glossary

Calyx

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

 

Corolla

A collective name for all of the petals of a flower.

 

Pinnate

Having the leaflets of a compound leaf arranged on opposite sides of a common stalk.

 

Raceme

An unbranched, elongated inflorescence with stalked flowers. The flowers mature from the bottom up.

 

Sepal

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

 

Sucker

A basal shoot rising from the roots or from a bud at the base of a shrub or tree.

       

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  Dwarf False Indigo, コマツナギ
Koji Kimura
 
   
 
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Published on Aug 19, 2013

Dwarf False Indigo, コマツナギ

 
     

 

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