THE VEGETATION OF THE JUAN FERNANDEZ ISLANDS 875 



species than the former; culms as much as 2 m tall according to Johow. With 

 flowers Jan. — April. 



Agrostis masafueraiia Pilgcr. luideiiiic in the Alpine region of Masafucra, 

 1 300-1 350 m, rare. Moderately cespitose; found with flowers in February. 



DaniJwjtia collifia Phil. Masatierra, on dry, stony ridges with thin soil; both 

 sides of the main range in the central part of the island, 200 — 400 m, .scarce 

 though locally abundant. A tunicate grass forming hard, compact clumps; leaves 

 rigid, 10 — 20 cm long, persistent, culms 50 cm tall or more. With flowers Dec. — 

 Jan. and fruit in January. 



Koeleria micrathera (Desv.) Griseb. Masatierra, very rare and only seen by 

 us in a single locality near Portezuelo de Villagra. Densely tufted, leaves about 

 30 cm long, culms about 50 cm. W^ith flowers in January. 



Bromus masafucranus Pilger et Skottsb. Pandemic on Masafuera, seen in a 

 single place among rocks about 1350 m above sea-level. A very conspicuous, 

 densely tufted grass, forming large tussocks V2 r" high with culms to 75 cm tall. 

 W'ith flowers and fruit in P'ebruary. 



Cyperus eragrostis Lam. (C. vegetus Willd.) Both islands; in moist places, 

 mostly near the sea. A robust species with flowers and fruit Jan. — Feb. 



Scirpiis iwdosus Rottb. Both islands; scattered on Masatierra from the coast 

 to the elevated ridges and rather common on the south slopes, ranging west to 

 Bahia Chupones. P"requent along the shore on Masafuera. A rigid rush, to 60 

 cm tall. With flowers from late winter to February. 



Scirpiis cernuus Vahl. Both islands, forming dense, low-growing mats in 

 marshy places along the shore and on stream banks in some of the valleys. With 

 flowers and fruits Dec. — Feb. 



Heleocharis maculosa (Vahl) Kunth. subsp. fuscopiirpurea (Steud.) Kuekenth. 

 Known from two places on Masatierra, growing along running water. Small, mat- 

 forming. With flowers and fruits Dec. — ^Jan. 



Cladhim scirpoideuin (Steud.) Benth. et Hook. fil. Endemic on Masatierra, 

 ranging through the forest country from Pangal to Quebrada Juanango and from 

 about 200 m or occasionally less to the summit of El Yunque, a dominant feat- 

 ure of the cascades. A large Vincentia with very long and narrow, ribbon-like 

 leaves pendent from the rocks; the leaves will reach a length of 2 m in such 

 places (PI. 78). With flowers Nov. — April. 



Uncinia Douglasii Boott. Endemic, common on both islands in the forests 

 and on the barrancas of the gorges. A slender, soft and graceful sedge with 

 leaves and culms Y2 — ^ "^ long- With flowers and fruits Dec. — P^eb. A closely 

 related species is U. costata Kuekenth., known from a single locality on Masafuera. 

 Three non-endemic species belong to the Alpine region of Masafuera: U. tenuis 

 Poepp., a small plant not over 20 cm high and scattered from 900 to 1500 m, 

 U. brevicaulis Thouars, tufted, 20 — 30 cm tall, iioo — 1400 m, scarce, and U. phle- 

 oides Pers., in a single locality at 1130 m, a robust, densely tufted species (PI. 

 115:1). All with fruits in Feb. — March. 



Carex Banksii Boott. Masafuera, known from a single locality, about 1350 



