| Code | Definition | Number of Accessions |
| AT | IN LEAF AXILS AND TERMINAL (especially for some Amaranthus tricolor) | 171 |
| AX | MOSTLY IN LEAF AXILS | 74 |
| ED | CLUB-SHAPED AT TIPS, THE EDULIS, OR DETERMINATE TYPE | 28 |
| LB | LONG SIDE BRANCHES, GREATER THAN 1/4 THE INFLORESCENCE LENGTH | 361 |
| SB | SHORT SIDE BRANCHES, 1/4 OR SHORTER THAN THE INFLORESCENCE LENGTH (INCLUDES SOME MANY-STEMMED WEEDS) | 628 |
| SK | SPIKE, AT LEAST 4 VERTICAL SPIKES (LONG SIDE BRANCHES) THAT ARE APPROXIMATELY 1/2 THE INFLORESCENCE LENGTH, OR LONGER | 59 |
| XX | OTHER (SPECIFY) | 18 |