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Sonoran Desert Asters - Flowers White

Annuals, perennials and shrubs with flowers in heads that may have white disc and/or ray flowers. Some flowering heads may appear yellow due to abundance of pollen. Some species have male and female flowers in separate heads or even on separate plants. Usually insect pollinated and mostly not a source of hay fever.

Esteve's Pincushion	Chaenactis stevioides	Spreading Fleabane	Erigeron divergens
Spring annual. Heads entirely of star-shaped disc florets with perimeter florets often larger. Common on rocky slopes and desert flats. Detailed Description		Spring annual with abundant reflexed or spreading hairs on foliage. Many 10 cm dia. daisy-heads. 100+ narrow white to purple rays. Washes and roadsides. Detailed Description
Pebble Pincushion	Chaenactis carphoclinia	Tidy-tips	Layia glandulosa
Spring annual mostly growing in open, desert pavement areas. Phyllary tips long-pointed and marginal florets little, if at all enlarged. Present only in years with good rain. Stems and bracts sometimes with short rusty hairs. Detailed Description		Perfect daisy on a delicate spring herbaceous plant. Sandy soils in mid to upper elevations of the Sonoran Desert. Blooms in mid spring. Detailed Description
Desert Chicory	Rafinesquia neomexicana	White Tackstem	Calycoseris wrightii
Spring annual with white strap shaped florets. Leaves linear segmented. Conspicuous glands on stems below head. Sonoran Desert in years with good rain. Detailed Description		Spring annual often growing up among woody shrubs and gaining support from them. All florets bear strap-shaped corollas. Leaves lobed or just toothed. Common across the Sonoran Desert in years with good rain. Detailed Description

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White Easterbonnets	Antheropeas lanosum	Yerba de Tago	Eclipta prostrata
Ephemeral spring annual just a few centimeters tall. Leaves and involucre wooly. White rays and yellow disc. Detailed Description		Low herb with small white flowers growing prostrate on ground. Damp soil near rivers, agriculture or in lawns. Detailed Description
Hairy Horseweed Asthma-weed	Conyza bonariensis	Horseweed	Conyza canadensis
Leaves fuzzier than typical horseweed and able to grow under much drier conditions. Very small florets in small head. Seeds with fluffy pappus. Detailed Description		Weedy annual found in gardens and unmown lawns. Generally restricted to irrigated ground in the Sonoran Desert. Detailed Description
Wright's Thimblehead	Hymenothrix wrightii	Loomis' Thimblehead	Eclipta prostrata
Tall perennial herb with pin-cushion heads of white florets and purple stamens. Summer and Fall. Detailed Description		Tall perennial of late summer/fall, growing and blooming after summer rains. Upper Sonoran Desert. Detailed Description

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Sonoran Desert Places