Synonyms - Astragalus pelicinus
Biserrula is from bi meaning twice and serrula is Latin for a little saw referring to the toothed crests on the pods
An introduced pasture legume with distinctive seed pods.
Made up of many paired leaflets.
Petiole - yes.
Blade - of leaflet, oval, serrated, hairy, notched tip.
Stem leaves -
Flower head:Clusters of flowers.
Flowers:Purple, pea type.
Nitrogen fixing nodules.
Key Characters:Scrambling hairy stems.
Paired serrated, hairy leaflets that may have a notched tip.
Physiology:Legume. Fixes atmospheric nitrogen by a rhizobia association in the roots.
Seed Biology and Germination:Vegetative Propagules:
Cultivars include Casbah.
Several cultivars have been selected for commercial evaluation
Allelopathy:Population Dynamics and Dispersal:
Spread by seed.
Origin and History:Introduced and spread by deliberate plantings as a pasture legume.
Distribution:ACT, NSW, NT, QLD, SA, TAS, VIC, WA.
Not recorded as naturalised.
Produces good quantities of palatable fodder.
Fixes atmospheric nitrogen in the soil.
Management and Control:Thresholds:
Picloram based products such as Tordon® 75-D will provide good knockdown and residual control.
Herbicide resistance:None reported.
Biological Control:Related plants:
None in the same genus in Australia.
Medics, Clover, Lupins, Peas
Plants of similar appearance:Vetch has purple flowers and similar leaves but has a tendril on the end of each leaf.
Caltrop has similar leaves but yellow flowers.
References:Bodkin, F. (1986). Encyclopaedia Botanica. (Angus and Robertson, Australia).
Everist, S.L. (1974). Poisonous Plants of Australia. (Angus and Robertson, Sydney).
Lamp, C. and Collet, F. (1990). A Field Guide to Weeds in Australia. (Inkata Press, Melbourne).
Collated by HerbiGuide. Phone 08 98444064 or www.herbiguide.com.au for more information for more information.