Oxylobium
Fabaceae - Callistachys lanceolata
BioSecurity

What does it look like?

Oxylobium is a tall evergreen shrub (3-8m high) with densely hairy angular stems.  Leaves are oval- shaped, narrow and 30-80mm long, silky when young and hairless and smooth when mature.  Dense terminal flower clusters of yellow/orange pea-like flowers (each 10-15mm long) appear in spring.  Seedpods are densely silky initially but become hairless, hard and ribbed when mature (13-17mm long, containing 6-8 reddish black seeds).

Shrubland, grassland, tussock, seasonal wetlands, wasteland and disturbed areas.  Prefers dry and sandy coastal areas.  Tolerant of hot, dry, wind, salt, damage and low nutrient soils.  Intolerant of moderate shade.  Benefits from fire and physical disturbance.

Why is it a problem?

Invasive overseas.  Fast growing, thicket forming species that colonises rapidly after disturbance.  Germination is improved by fire.  Rapid growth and ability to increase soil nitrogen can enable it to out-compete other plants, particularly low growing shrubs and ground cover species.

Seed remains viable in the soil for long time. 

Control Methods

  1. Hand pull small plants (all year round). Mulch.
  2. Cut trunk and paint stump (all year round): cut trunk near to the ground, and swab freshly cut stump with metsulfuron-methyl 600g/kg (2g/L); or Tordon BK (100ml/L)
  3. Overall spray (spring-summer): metsulfuron-methyl 600g/kg (5g/10L) + penetrant: or Tordon BK (60ml/10L+ penetrant).

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