302 
It seems, therefore, advisable to retain for the present the 
generic name given by Hooker in 1854, and to restore the trivial 
rariflora given ak Hooker in 1847 for the type, which then 
becomes O. rarafl 
Orthachne ae (Hook f.) Hughes nov. comb.; O. re- 
torta Nees in Steud. Syn. Pl. Gram. 121 (1845); IM uehlenbergia 
rariflora Hook. f. Fl. Antarct. 371, t. 131 (1847); Gay. Fl. Chil. 
vi. 293 (1849); Kurtz in N. Alboff Contrib. Fl. Terre de Feu ii. 43 
(1896); Macloskie in Scott Patag. Exped. 179 (1904) et in Suppl. 
33 (1914); Stipa rariflora Benth, in Journ. Linn. Soc. xix. 81 
(1881); Speg. Pl. per Fueg. coll. 82 (1896); Dusen in O. Nordensk. 
Svenska Exped. till Magell. iii. 218 (1900); E. de Wildeman, 
Phan. des Terres Magell. 38 (1905); Macloskie in Scott Patag. 
Exped. 175 (1904). 
Temperate 8. America: Chile: Taytao Peninsula, C. Tres 
Montes, Darwin! Rio Azapardo, Dusen (1897); Brunswick 
eninsula, Port Famine, King ! 
Tierra del Fuego: Orange 
Harbour, Wilkes! Desolation 
Island, Dusen (1896); Ushnaia, 
N. Alboff 1002; Staaten Island, 
Port Cook, Spegazzint (1882). 
O. pilosa Nees in Seemann, 
Bot. Voy. Herald 225, O. scabra 
and O. tenuis Fourn. in Bull. 
Soc. Bot. Fr. xxvii. 295 (1880) 
and O. floridana Nash in Small 
Fl. S. E. U. St. 119 (1903) 
belong to the section of Aristida 
in which the lateral awns are 
suppressed. 
The genus Streptachne was 
first described by Robert Brown 
in Prodr. Fl. Nov. Holl. p. 174 
(1810). His only species, S. 
Solander on the Endeavour 
River, Queensland, and now in 
the British Museum. It con- 
sists of two inflorescences with 
ne base or leayes. In general 
appearance it is very similar 
to Stipa, but differs from that 
genus in the awn being con- 
tinuous with the fertile valve 
4] 4 with no suggestion of an articu- 
Streptachne stipoides - I, spikelet; lation, and in there being only 
II, fertile floret; III, valvule of two lodicules. The valve is 
fertile floret; IV, lodicules; all x 3. hairy on the callous only, and 
