THE VEGETATION OF THE JUAN FERNANDEZ ISLANDS 



841 



Fig. 10. Dense stand of Atistotelia »iaquL a macal along trail to \'alle Anson, Masatierra. 



Photo 303 1917. 



The rosette trees. 



This interesting growth-form is particularh' well represented in Juan Fernandez 

 where no less than 25 species occur, representing 12 genera, of which 9 are endemic, 

 and 4 families: Compositae (9 genera, 20 species), Umbelliferae (i gen., 3 sp.), 

 Plantaginaceae (i sp.), and Broneliaceae (i sp.); 5 species approach the rosette 

 type closely, but will be treated separately. Buds never protected by bud 

 scales. As a rule the rosette trees are not found in the closed forest; they may 

 be met with in open glades and concentrate in the narrow belt where the forest 

 is replaced by scrub at the foot of the steep rocky ridges. Two morphological 

 types are distinguished: a) the candelabrum type; below the tertiiinal inflorescence 

 2 or 3 innovations are developed, resulting in a pseudo-dichotomic — trichotomic 

 mode of branching (all genera except 3 or 4); b) the palmiform type, either pollac- 

 anthic with axillary inflorescences [Plantago) or hapaxanthic with terminal in- 

 florescence [Phoenu'oseris); stem simple. For Ywiquea and Hesperogreigea, see below. 



a. The Candelabrum type. 



Centaur ode 7idr 071 dracaenoides Johow. Compositae. Confined to the elevated 

 ridges encircling Bahia Cumberland, from Cerro Damajuana to north of Portezuelo 

 de Villagra and ascending to the summit of El Yunque; not seen below 500 m. 



56 — 516796. The Sat. Hist, of Juan Fernandez and Easter Isl. Vol. II. 



