RUNOFF PRIMARY.
Tex. ELEC Code § 172.004.
in effect(a) If no candidate for nomination to a particular office receives the vote required for nomination in the general primary election, a runoff primary election shall be held to determine the nomination.
(b) The candidates in a runoff for a nomination shall be determined and a tie vote in a runoff resolved as provided by Subchapter B , Chapter 2 , for a runoff for an election to office.
SUBCHAPTER B. APPLICATION FOR PLACE ON BALLOT