THE PHANEROGAMS OF THE JUAN FERNANDEZ ISLANDS 20 1 



II. Head smaller. Flowers whitish. Achenes not winged. 



A. Stem simple, hollow. Receptacle fibrillose. Leaves pinnate. 



Subgen. II. Phoenicoseris Skottsb. 



1. Pinnae deeply bifurcate with linear segments. 



D. pinnala (Bert, et Dene) Hook, et Arn. 



2. Pinnae ± ovate, dentate. 



a. Petiole winged, but not auriculate. 



D. pinnata var. insignis (Bert.). 



b. Petiole auriculate D. regia Skottsb. 



B. Stem branched, solid. Receptacle naked. Leaves entire. 



Subgen. III. Rea (Bert, ex p.) Skottsb. 



1. Leaf- margin minutely denticulate or entire. Ligule 5 -dentate. 



Sect. 1. Eurea Skottsb. 



a. Leaves petiolate. Involucre funnel-shaped, c. 5 mm high. 



+ . Leaves coriaceous, narrow lanceolate. 



D. neriifolia (Dene) Hook, et Arn. 

 + + . Leaves chartaceous, ovate-lanceolate. 



D. micrantha (Bert, et Dene) Hook, et Arn. 



b. Leaves sessile. Involucre campanulate, c. 10 mm high. 



D. pruinata (Joh.) Skottsb. 



2. Leaves densely dentate-serrate, very thin. Ligules deeply 5'deft. 



Sect. 2. Schizoglossum Skottsb. D. gigantea Joh. 



Bentham and Hooker Fil., Gen. plant. II. 219, describe the achene of 

 the Dendroseriidae in the following terms: »Achaenia a dorso compressa sub- 

 trigona v. 2 — 3-alata». This description fits the genus Fitchia, a genus not 

 very near Dendroseris. The achene of Thamnoseris is unknown. The marginal 

 achenes of Dendroseris are more or less compressed from the back, triangular 

 in section, with two lateral and sometimes also with a ventral wing in Eu- 

 dendroseris. But all the other achaenia in the head are compressed from the 

 sides, and their wings in Eudendroseris are dorsal and ventral only. This 

 dimorphism clearly stands in relation with the different position in the head. 

 It is illustrated below, fig. 37. 



133. D. macrophylla D. Don. — Johow, Estud. 70 p. p. min. — Fig. 

 37 a, m. 



Masafuera: Cuming! Downton! — ■ On the walls of the canyons, also 

 higher up on the ridges and on the top of the lofty coast cliffs in some places, 

 scattered. Ravines above Q. Sanchez, solitary specimens; Q. de las Casas, rock 

 ledges (fl. 23 /2 17, no. 362; also observed by Johow); Q. de las Vacas (also 

 Johow); Q. Inocentes, some large trees on the cliffs c. 500 m; Q. Angosta, in 

 the narrow gorge; Rodado del Sandalo, on the top of the cliff; Q. de la 

 Loberfa, some fine trees, c. 250 m. 



There is a good illustration of this species in Curtis, Bot. Mag. t. 6353. 

 The specimens growing in the fissures on the canyon walls are small and 

 seldom more than 2 or 3 m high; in more suitable places there are much larger 

 ones, at least 5 or 6 m high and with a trunk 15 or perhaps 20 cm thick, so 



