190 



ADDITIONS TO THE FLORA OF SOUTH AUSTRALIA. 

 NO. 17. 



By J. M. Black. 



[Read July 8, 1920.] 

 Plates IX. and X. 



Where a district is mentioned, it means a new record for 

 one of the botanical districts of Tate's Flora of Extra-tropical 

 South Australia. 



The asterisk indicates an alien plant. 



PiNACEAE. 



Callitris cupressiformis. Vent. var. tasmanica^ Benth. 

 Slape Gully, near Adelaide (PI. Griffith); Cape Borda, K.L 

 (J. W. Mellor) ; River Onkaparinga, near Clarendon 

 (J. M. B.); Middle River, K.I. (E. Ashby). 



This variety was raised to specific rank as C. tasmanica 

 by Baker and Smith (Pines of Aust. 233), principally on the 

 ground that C. cwpressiforniis: has erect branches, and C. 

 tasmanica spreading, horizontal branches. This statement is 

 borne out by the photographs w^hich accompany Messrs Baker 

 and Smith's fine work, but my experience in the field has 

 been that the direction of the branches of Callitris (notably 

 of C. rohvsta and C. propinqua) vary greatly in individual 

 trees. The specimen from Slape Gully is described as "a 

 rounded shrub resembling the Native Cherry ( E xocarpus 

 cujyressifoDnis), 3-4 m. high." Mr. Ashby tells me. that the 

 specimens grown on his land at Blackwood, from seeds 

 obtained some years ago at Middle River, have erect branches. 

 It therefore appears to me safer to retain the varietal name. 

 At the same time I follow Messrs. Baker and Smith in 

 uniting Bentham's two varieties tasmanica and mvcronata. 

 The Slape Gully and Cape Borda specimens have been already 

 recorded under the latter name in these Trans., xxxv., 61 

 (1911). Our specimens have the wrinkled valves of var. 

 tasmanica and the prominent spurs of var. mucronata. 



C . Dnimmnndii, (Parlat.) Benth. et Hook. Also grown 

 by Mr. Ashby from seeds obtained at Middle River, K.I. 

 Hitherto this species has only been recorded in South Aus- 

 tralia from Arno Bay, E.P. The branchlets are light green 

 and very slightly furrowed, while those of C. cupressiformis 

 var. tasmanica are dark green and deeply furrowed. 



