Sisymbrium irio L.

BRASSICACEAE OF ARIZONA
Pima County
Sisymbrium irio L.
Rincon Peak 7.5' USGS topographic Quadrangle; 12S 05 37
lOOmE 35 48 250mN (NAD27); 32° 04.3^ 110° 36.4'W;
1105m (3620ft) elevation; Rincon Mountains, Posta Quemado
Canyon, 20km SE of the edge of Tucson, 2.5km WSW of
Papago Spring, flood plain of narrow valley, desert scrub with
Acacia greggii, Acourtia nana, Agave palmeri, Aloysia wrightii,
Ambrosia confertiflora, Aristida purpurea, Berberis trifoliata,
Bouteloua curtipendula, Carnegiea gigantea, Celtis reticulata,
Cottea pappophoroides, Cylindropuntia leptocaulis, Digitaria
californica, Echinocereus fasciculatus, Ephedra trifurca,
Eragrostis lehmanniana, Ferocactus wislizeni, Gutierrezia
sarothrae, Hibiscus denudatus, Isocoma tenuisecta, Krameria
erecta, Larrea tridentata, Machaeranthera canescens, M.
pinnatifida, Matelea producta, Muhlenbergia porteri, Opuntia
engelmannii, O. phaeacantha, Pappophorum vaginatum,
Parthenium incanum, Prosopis velutina, Psilostrophe cooperi,
Rhynchosia physocalyx, Sporobolus contractus, Tridens
muticus, Zinnia acerosa, and Ziziphus obtusifolia.
Common and abundant mostly erect annual, flowers
yellow.
Marc A. Baker 16479	31 March 2007
with Sarah Hunkins
03197439