Seed germination of Hesperozygis ringens (Benth.) Epling, an endemic and threatened species

Hesperozygis ringens (Lamiaceae), popularly known as espanta-pulga, is a threatened species endemic to rocky and sandy regions of the Pampa biome. One factor that can influence low number individuals seed germination rate influenced by temperature and/or light. Thus, objective this study was evaluate light on H. ringens. The seeds two lots were sown paper substrate maintained in BOD chambers at temperatures 15, 20, 25 30ºC presence absence speed evaluated every 3 days for 21 days. experiment completely randomized with treatments had 4 x 2 factorial design. first visible sign (protrusion primary root) observed seven after sowing. Germination occurred both lowest significantly process speed. For germinating species, 15°C most favorable compared 30°C. It be concluded 15ºC favors seeds, which are insensitive