Table S1.

List of species used in this experiment and their growth forms

Species	Growth form
Stipa pulchra (formerly Nassella pulchra)	Perennial grass
Chlorogalum pomeridianum	Perennial forb
Calystegia subacaulis	Perennial forb
Muilla maritima	Perennial forb
Plantago erecta	Annual forb
Lessingia nemaclada	Annual forb
Festuca microstachys (formerly Vulpia microstachys)	Annual grass
Microseris douglasii	Annual forb
Lasthenia californica	Annual forb
Hesperevax sparsiflora	Annual forb
Eschscholzia californica	Perennial forb
Calandrinia ciliata	Annual forb
Layia gaillardioides	Annual forb
Acmispon wrangelianus (formerly Lotus wrangelianus)	Annual forb (N-fixing)
Cryptantha flaccida	Annual forb
Hemizonia congesta	Annual forb

Species in bold are those species for which phenological data were recorded. Species names follow Baldwin et al. (42), with previous names shown in parentheses.