OF MARINE COASTS. 12a 



THYMELAEACEAE. 

 Pimelea arenaria A. Cunn. 



This plant, characteristic for the driftsands of New Zealand and 

 Chatham Island, is described by Cockaj'nel) in the following words: 



" The long cord-like underground stems put forth adventitious roots 

 near their extremities, which latter, bending upwards, raise themselves 

 above the encroaching sand. The leaves are all most densely silky on 

 the under surface, a most efficient protection against excessive transpira- 

 tion. Owing to the leafy extremities of the stems being erect, the semi- 

 rosettes of leaves can receive the incident light to the best advantage. 



"It is probahle that the oldest portions of the plant — i. e., the most 

 deeply buried portions — die, while the plant continues to increase by 

 the rooting of its terminal shoots." 



P. prostraia Willd. is another species also found on jSTorth Cape 

 of New Zealand. 



P. serpyllifolia E. Br. 



Low shrub, rigid, densely branched, glabrous; leaves opposite, ovate 

 or oblong, coriaceous, somewhat concave; flowers small, yellow. 



Common on coastal sands of Victoria, South and West Australia, 

 but mostly in the interior. Also in Tasmania. 



ELAEAGNACEAE. 

 Hippophae rhamnoides L. 

 Shrub, 3 — 13 dm. high, with a scaly scurf, silvery on under surface 

 of the leaves, thin on upper side — rusty on young shoots ; axillary shoots 

 ending in a prickle; leaves alternate, linear, entire. 

 Common in Europe, Central and North Asia. 



EUPHORBIACEAE. 



Adriana tomentosa Gaudich. 



Shrub, 6 — 12 dm. high, covered with a stellate tomentum; leaves 

 alternate, usually glabrous on upper side, petiolate, deeply 3-lobed, with 

 narrow, obtuse lobes. 



Sand dunes of South Australia (according to Tepper), coast of 

 North and Northwest Australia. 



Beyeria opaca F. Muell. 

 Erect shrub, 3 — 6 dm. high; leaves oblong or linear, obtuse, with 

 revolute margins, white underneath. 



1) A short account of the plant covering of Chatbam Island, p. 260. 



