Turpentine Bush
Ericameria laricifolia
Broom Snake Weed
Gutierrezia sarothrae
Medium shrub of upper elevations of the Sonoran Desert. Pine like leaves resinous. Bright yellow flowers late summer to fall. Detailed Description
Fall-blooming shrub of rangelands in the upper elevations of the Sonoran Desert. Flower heads small, numerous and with bright yellow flowers. Stems and leaves broom-like. Detailed Description
Pygmy-Cedar
Peucephyllum schottii
Annual Goldeneye
Long-leaf False-Goldeneye
Heliomeris longifolia
Viguiera annua
Dark green fir-like leaves on medium or large shrub. Yellow discoid flower heads. Western Sonoran and Mojave Deserts. Detailed Description
Summer annual with opposite, linear, leathery leaves. Found mostly at the highest Sonoran Desert elvations or near riparian habitat. Detailed Description
Silver Wormwood
Artemisia ludoviciana
Camphorweed
Heterotheca subaxillaris
Summer perennial on rocky slopes and in canyons with silvery foliage and small yellow heads. Detailed Description
Summer annual with tall, widely branching, course stems. Leaves with strong camphor-like odor. Grows at roadsides and along washes. Detailed Description
Burrobush
Isocoma tenuisecta
Malta Star Thistle
Centaurea melitensis
Goldenrod-like shrub with narrowly dissected, non-resinous leaves. Upland Sonoran Desert from Tucson area and south in disturbed soils and near washes. Detailed Description
Spring annual with spikey yellow florets surrounded by sharp spines on the bracts. Spines are 10 mm or less long. Invasive weed along washes and riparian habitats. Detailed Description
Sow Thistle
Sonchus oleraceus
Prickly Sow Thistle
Sonchus asper
Spring annual weed mostly of urban setting but also in riparian habitat. Yellow dandelion flowers at top of tall branching inflorescence. Detailed Description
Dandelion-like weed with usu. sharp prickles along margins of leaves. Seed with plume of fine bristles. Detailed Description
Common Groundsel
Senecio vulgaris
Pineapple Weed
Matricaria discoidea
In the Sonoran Desert a spring weed of yards and farms. Yellow-tipped heads without rays; Black tips of bracts around heads. Detailed Description
Diminutive spring annual with very small, green yellow-heads without rays. Leaves finely dissected, aromatic when crushed. Moist spots in wetter years. Detailed Description
Stinknet
Oncosiphon piluliferum
Chinchweed
Pectis papposa
The bi-pinnatifid leaves, soft and fern-like, emit noxious odor when crushed. Invasive weed grows in spring. Detailed Description
This annual of late summer and fall arises after the summer rains. Forms bright yellow clumps 10 to 30 cm in diameter. Detailed Description