480 PLANTS OF NEW ZEALAND 



have been developed, probably, as a protection against drought 

 and excessive radiation (v. Haastia j^ulvinaris, p. 424). In 

 other parts of the world, patch-plants are found chiefly in 

 alpine districts. Their occurrence in low-land regions, as in 

 New Zealand river-beds, is exceptional. In the Swiss Alps 

 they are represented by certain species of Androsace and 

 Saxifraga, which, however, are rather rosette-plants, than true 

 cushion-plants. They are most abundant in the Andes, where, 

 according to Schimper, their representatives are forms of most 

 diverse affinity. This really shows that the common habit of 

 the various cushion-plants is due to environment, and not 

 to relationship. Indeed, the conditions of life in some parts of 

 the Andes, are so similar to those in the Southern Alps, that 

 the vegetation in these widely separated districts is externally 

 much alike. A New Zealander, suddenly put dow^n in the 

 Andes of Peru or Bolivia, might still think himself at home, on 

 account of the similarity of the plant forms about him, to those 

 of his native land. This resemblance, however, is only in 

 small part due to actual affinity, and much more to parallelism 

 of evolution, resulting from similarity of surroundings. 



The New Zealand Baoulias are often very beautiful, owing 

 to their symmetry of form and leaf arrangement. Some are 

 coralloid in appearance, though resilient to the tread, like a 

 good carpet. They grow where other forms of life cannot find 

 a footing, and thus have generally plenty of room to develop 

 their own individuality. 



Genus Helichrys n m . 



Herbs or small shrubs. Leaves alternate, woolly. Heads solitary or in 

 corymbs. Bracts of the involucre often appearing like petals. Disk-florets 

 4-5-toothed. Ray-florets fev?. Pappus-hairs simple, or studded with short 

 bristles. About 16 species in New Zealand, all enderaic. (Name from the 

 Greek, signifying an everlasting flower) 16 sp. 



Helichrysum selago {The Selago-Uke Everlasting). 



A shrub, 1 ft. -9 ft. in height. Leaves closely imbricate, leathery, concave, 

 woolly. Head terminal, sessile, solitary, not sunk amongst the leaves. Florets 



