28 PATAGONIAN EXPEDITIONS I BOTANY. 



HIEROCHLOE Gmel. 



H. arenaria Steud., Macl., p. 167, is to be deleted, being identical with 

 Hierochloe redolens (Forst.) R. Br. 



Add Macl., p. 167: 



H. PUSILLA Hack. 



Hackel in Dusen, Neue Pflanz. Patag., p. 4, Taf. i, Fig. i and Taf. 7, 

 Fig. i. 



Rhizoma repens, stoloniferum ; culmi 3-4 cm. alti, robusti, teretes, 

 retrorsum pubescentes, specie enodes ; folia in basi culmi dense aggregata, 

 patentia, glabra ; vaginae inferiores breves, summa vero 2 cm. longa, ven- 

 tricosa, lamina mucroniformi terminata, infimas emortuae fuscae culmi basin 

 dense cingentes atque tumefacientes ; ligula brevissima, truncata ; laminae 

 lineares, apice cucullato-obtusae, planae vel siccitate complicatae, ad 2.5 cm. 

 longae, explicatse 2 mm. latae, rigidae, laeves, nervis paucis crassiusculis 

 supra prominentibus percursae; spiculae 5-7 in racemum subsimplicem, 

 brevem (ad 1.5 cm. longum) densum confertae, imbricatae, breviter pedi- 

 cellatae, pedicellis rachique communi glaberrimis, ovatae, brunnescentes, 5 

 mm. longae : glumae I et II aequales, spiculae longitudinem aequantes, late 

 ovatae, acutae, tenuiter 3-nerves, nervis lateralibus brevibus, tenuiter mem- 

 branaceae, albidae, glaberrimae ; III et IV spiculam subaequantes (4.5 mm. 

 longae), late ovales, cymbiformes, apice hyalino, albido, obtuso, emarginato 

 vel (in glum. IV) integro, subrecurvo, ceterum chartaceae, brunnescentes, 

 scabras, 7-nerves, omnino muticae, paleam eius longitudinem aequantem 

 multo angustiorem binervem floremque <? triandrum foventes ; gluma V 

 (fertilis) 3.5 mm. longa, ovalis, obtusa, fusiformi-involuta, coriaceo-char- 

 tacea, glabra, nitens, brunnea, subenervis ; palea earn asquans, late oblonga, 

 binervis; stamina 3, antheris (an semper?) effcetis; ovarium oblongum, 

 stigmatibus ex apice glumae longe exsertis. 



North of Lago San Martin by Rio F6siles associated with Bolax 

 gummifera (Lam.) Spreng.; alt. c. 1,000 m. 



Description. Rhizome creeping, stoloniferous ; culms 3-4 cm. high, 

 retrorse-pubescent ; leaves patent, smooth, aggregate at the base of the 

 culm ; lower sheaths short, uppermost ones 2 cm. long with a mucronate 

 blade; ligule very short, truncate; leaf-blades linear, rigid, smooth, dry 

 complicate with few nerves; spikelets 5-7, ovate, with short pedicels, 

 imbricately jointed to a dense subsimple panicle; pedicels and rachis 



