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Nuytsia Vol. 7, No. 2 (1990) 
Key to the taxa 
1. Stipules spinescent 6. A. unguicula 
1. Stipules not spinescent 
2. Phyllodes with yellow marginal nerves 
3. Heads pedunculate; flowers 4-merous; phyllode blade 
c. equally thick at centre of phyllode and at marginal nerve 4. A. patagiata 
3. Heads sessile; flowers 5-merous; phyllode blades about 
twice as thick as marginal nerves (2. A. mimicd) 
4. Phyllodes (18-)20-30(-35) mm long, 3-8 times longer than wide. 
Seeds mottled, usually light grey-brown on dark tan 2a. A. mimica var. mimica 
4. Phyllodes (25-)40-80(-105) mm long, 12-45 times 
longer than wide, ± compressed. Seeds molded, 
usually dark tan on light grey-brown 2b. A. mimica var. angusla 
2. Phyllodes lacking yellow marginal nerves 
5. Stipules subulate or caudate-subulate, 24 mm long 
6. Flower heads sessile, bracteate basal ly; 
sepals and petals ± 2/3 united 5. A. torticarpa 
6. Flower heads shortly pedunculate, non-bracteate, 
sepals and petals free 1. A. caesariata 
5. Stipules not subulate, much shorter 
7. Phyllodes 1.5-2 cm long with stomata obscure or at least not obviously 
raised; stipules caducous A. ancistrophylla 
7. Phyllodes about 3 cm long with raised stomata between 
the nerves (xlO magnification) 
8. Apex of phyllodes recurved, not at all ± pungent, 
phyllodes straight or shallowly curved A. lineolata 
8. Apex of phyllodes straight, pungent, 
phyllodes mostly strongly incurved 3. A. multilineata 
1. Acacia caesariata Cowan & Maslin, sp. nov. (Figure 1) 
Frutices densi rotundato-triangulari vel plano-coronati 0.6-1. 3 m aid, ramulis tomentosis. 
Slipulae persistentes, subulatae, 2-4 mm longae, pilosae. Phyllodia anguste oblongo-oblanccolata, 
rotundato-obtusa et mucronata, versus basim attenuata, 20-45 mm longa, 3-10 mm lata, erecta, recta 
ad leviter incurvala, tomentosa, tandem glabrcscentia, 1-3 nervis primariis in quoque superficie et 
nervis secondariis numerosis, salientibus, glande plus minusve 2 mm super pulvino. Pedunculi 
(1.5-)3-4 mm longi, 2 in quoque axilla, lomentosi. Capitula globularia, 4 mm diametro, 18-20- 
floribus. Flores 5-meri. Sepala pctalis plus minusve dimidia breviora, linearia, discreta. Petala 
discrela, glabra. Legumina anguste oblonga, 12-25 mm longa, 2.5-3 mm lata, chartacea, arcuata ad 
irregulariter flexuosa, pilosa. Semina longitudinalia, ovalia, elliptica vel oblonga, 2.5-3 mm longa, 
1.2-1. 8 mm lata, nitida, nigra; pleurogramma arcuata, 0.3-0.5 mm long; arillo apicali, galeato. 
