77 



*Xanthium orientate, L., ann. 1763 (X. canadense, 

 Mill, aim. 1768). Sent to the Department of Agriculture 

 from the neighbourhood of Renmark, and apparently 

 numerous. This weed is a congener of the Bathurst Bur 

 (*X. spinosum, L.), but has burs twice as large, with stouter 

 and longer spines and two large divergent beaks at the summit 

 of the bur. This is its first record in South Australia and it 

 is a most undesirable introduction. The body of the bur is 

 14-18 mm. long and with the two beaks it measures 17-25 

 mm. in length. Originally an American species, but may 

 have reached South Australia from the Mediterranean, as it 

 approaches closely to the descriptions of X. italicwm , Mor., 

 the name given to a form of X. oriental? naturalized in 

 Mediterranean countries. 



DESCRIPTION OF PLATES. 



Plate V. 



Triodia lanata, n. sp. 1, flowering glume. 2, palea. 3, 

 pistil, stamens, and lodicules. 



Plate VI. 



Trichinium seminudum, n. sp. 1, perianth. 2, inner segment 

 of perianth. 3, bract. 4, bracteolo. 5, pistil and stamens. 



Plate VII. 

 Poranthera triandra, n. sp. 1, male flower. 2, female flower. 

 3, female flower viewed from above after the fruit has fallen, show- 

 ing the 3 calyx- segments and the hypogynous disk. 4, female 

 flower and pedicel (fruit fallen). 5, embryo. 6, stamen. 



Oratystylis conocephala, S. Moore. 1, female flower. 2, 

 bisexual (or male ?) flower. 3, free, barren stamen of female 

 flower. 4, summit of style. 



Tillaea. 1, flower of T. S ie b eriana,. Schult. 2, carpel of same. 

 3, carpel of T. acuminata, F. M. Reader. 4, flower of same. 



Plate VIII. 



Brachycome tesquorum, n. sp. 1, female flower. .2, bisexual 

 flower. 3, outer involucral bract. 4, inner involucral bract. 

 5, aehene. 



