Table 1. Fecundity of three common exotic annual grasses is lower in perennial than in annual plots.

	Seed production, seeds per plant
Species	Annual plots	Perennial plots	P
B. hordeaceus	111.33 (15.13)	32.05 (4.77)	<0.001
B. madritensis	176.34 (28.19)	57.07 (7.25)	0.034
H. murinum	95.3 (10.04)	45.82 (7.65)	0.002

Standard errors (n = 14) are shown in parentheses.