Lappula occidentalis (S.Watson) Greene

Us
BORAGINACEAE OF ARIZONA
Pima County
Lappula occidentalis (S. Watson) E. Greene
Rincon Peak 7.5' USGS topographic Quadrangle; 12S 05 37
lOOmE 35 48 250mN (NAD27); 32° 04.3TSf 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, Camegiea gigantea, Celtis reticulata,
Cottea pappophoroides, Cylindropuntia leptocaulis, Digitaria
califomica, Echinocereusfasciculatus, 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 annual with erect to decumbent
stems; flowers white to pale blue.
Marc A. Baker 16473	31	March	2007
with Sarah Hunkins
03239309