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Weed Identification

bigpod sesbania

Family

Fabaceae

Scientific Name

Sesbania exaltata

Other Common Names:

sesbania
hemp sesbania
peatree
tall indigo
Colorado river hemp
coffee bean

Synonyms (former Scientific Names):

Sesbania macrocarpa
Sesbania exaltata
Darwinia exaltata

Habit

The stems are thick and smooth with two faint ridges along the upper portion, and the stem tips have few or no hairs.

Leaves

The leaves are 4-12 inches long and may have from 20-70 leaflets. The leaflets can be up to 3.5 cm long and 8 mm wide, and are smooth and somewhat waxy beneath.

Identifying Characteristics

It can be easily identified by its leaves, which are composed of many smaller leaflets, large yellow flowers and a distinctive curved seedpod.

Flower Seed Head

The petals are yellow and are often streaked or spotted with purple.

Seed Fruit

The fruit is a dry, smooth, linear pod from 10-20 cm long and 3-4 mm broad. Each pod contains from 30-40 seeds.

Where Found

Hemp sesbania occurs in low sandy fields, sand bars of streams, roadside ditches, along ponds or streams, and in disturbed urban or agricultural areas.

Growth Habit

upright and nonwoody

Thorns or Spines

not present

Approximate Flower Diameter

Varies: 
pencil
dime
nickle

Dominant Flower Color

Varies: 
white
yellow
purple

Flower Symmetry

radial symmetery

Leaf Hairs

no hairs

Leaf Shape

Varies: 
needle
lance

Leaf Arrangement

alternate

Leaf Margin

entire

Leaf Structure

pinnate

Leaf Stalk

shorter than leaf

Stem Hairs

no hairs

Stem Cross Section

round or oval

Milky Sap

not present

Root Structure

Varies: 
fibrous
taproot

Life Cycle

summer annual

Ochrea

not present

Plant Type

Herb