Summary[edit] Description: Stipa cernua—nodding needle grass (syn Nassella cernua).Photographed at Regional Parks Botanic Garden located in Tilden Regional Park near Berkeley, CA. Date: 11 April 2009, 09:03. Source: G20090411-4370--Nassella cernua--RPBG. Author: John Rusk from Berkeley, CA, United States of America. Camera location37° 53′ 40.28″ N, 122° 14′ 38.25″ WView all coordinates using: OpenStreetMap 37.894522; -122.243959.