336 THE FLOBA OF THE NOBTHEBN TEBEITOBY. 



19, A. dictyophleba, F. v. i¥.— " 235. 40 miles N.N.W. of Meyer's 

 Camp, on stony rises, 2nd June, 1911. " 



Tanami (Dr. H. I. Jensen). 



Sub-Seeies Dimidiatab. 



20. A. sericata, A. Cunn. — " 806. Near Bauhinia Downs Station, 

 24th March, 1912." In flower only. 



Three or four secondary nerves springing at intervals from the marginal 

 dorsal nerve. 



Stems and phyllodes quite glabrous, but the stems mealy. Glands on 

 phyUodes 4-5 in the depressions of the edges of the phyllode, and at the extreme 

 base. 



Flower-heads usually in fours or fives. 



The flower is smaller than that of var. Dunnii. It has some pale scattered 

 hairs on the sepals, and petals above the calyx. 



20a. Var. Dunnii, var. nov. — ^Pound (in Long. 129° 39' E., and Lat. 15° 

 14' S. approximately), at Blunder Bay, which. is about 10 miles above the 

 mouth of Victoria River, 



The first plant was observed on 22nd May, 1913, in Gouty Gum Gully 

 (Baobab trees grow there), about 1 J mUes up the creek from the anchorage on 

 the south side of the bay. Afterwards other plants were found growing on the 

 quartzite ridge that runs east and west opposite, and on the south side of the 

 anchorage at Blunder Bay. 



It occurs at sea level and up to 150 feet above, as on the creek level and on 

 top of the quartzite ridge. 



The plant first found grew in poor alluvial soil among stones at the side of a 

 small ruiming creek. On the ridge the variety grows on bare hard quartzite 

 rock without soil. The roots penetrate the cracks and fissures in the rock, and 

 it is marvellous to see such luxuriant foliage supported by apparently innutri- 

 tious material. 



Single stems without branches grow up to a height of 12 to 14 feet (including 

 the terminal spray of flowers), apparently in one season. Near the ground the 

 stems do not exceed one inch in diameter. The stems are round, and several 

 grow up from the same root. From top to bottom and including the branching 

 flower braniches they are glaucous. The top of the shoot spreads out into a 

 bunch of flower heads about 18 inches in length. 



The above notes are based upon a report by Mr. E.J. Dunn (Government 

 Geologist of Victoria), who with Mr. R. J. Winters collected it. 



The variety is larger in all its parts than the normal form. It is a superb 

 form. 



Mr. Dunn gives the length of the phyllodes up to 17 inches (say 43 cm.), 

 and I have seen thoroughly dry specimens up to 14|- inches (say 36 cm.) long, 

 and 7^ inches (say 18 cm.) iDroad in the middle. 



The glands do not quite agree with those of the normal form ; in var. 

 Dunnii the glands are on an angular or projecting kink of the marginal nerve, 

 and always terminating a main nerve. In the normal species the gland is at the 

 end of the nerve, and in the depressions of the marginal vein. 



Flower-heads up to four together, and on peduncles of various lengths. 

 5-merous. Each flower-hea^d about half an inch in diameter and flowers in 

 May (Dunn). 



Calyx-lobes (sepals) separated irregularly nearly to the base. It has a 

 strong central nerve to each lobe, and a thickened apex with long hairs. 



