Helianthus annus  L.

Ubiquity: Very uncommon outside of gardens

Distritution: Seen only in the wild on Yountville Cross Rd. (& Imola Ave. in Napa?)

Plant Communities:  Ruderal

Habitats: Moist streambeds/roadsides/ & cultivated areas like gardens; in alluvial formations

Elevation: 40-80'

Comments:  Probably not native; a garden escapee.  = H. a. ssp. lenticularis  & var. macrocarpus

Updated:  3/31/98


Helianthus californicus  DC.

Ubiquity: Very uncommon

Distritution: Known only from Capell Canyon & Lake Berryessa near the mouth of Putah Creek

Plant Communities:  Regular Chaparral, Annual Grassland

Habitats: Dry to moist, sunny, rocky, brushy or grassy creeksides/roadcuts; in sedimentary & volcanic formations

Elevations: 520'

Comments:  

Updated: 3/31/98


Helianthus exilis  A. Gray

Ubiquity: Common

Distritution: NE 1/4, Las Posadas State Forest, & Conn Canyon

Plant Communities:  Riparian, Serpentine Chaparral

Habitats: Moist, sunny, rocky, ultramafic, streamsides/streambeds/ditches/seasonal drainages/roadsides/ or roadbanks; in serpentine formations

Elevations: 440-2090'

Comments:  New Jeps. flora lumps this under H. bolanderi.  Responds to physical disturbance.  Limited Distribution (CNPS- List 4); collection needed

Updated:  3/31/98


Helianthus gracilentus  A. Gray

Ubiquity: Very uncommon

Distritution: Known only from Vaca Mts., Morgan Valley Rd., just SE of the Co. line, & Homestake Mine's waste rock pile

Plant Communities:  Regular & Serpentine Chaparral, Ruderal

Habitats: Dry, sunny, rocky, grassy slopes/summits; in disturbed places like roadsides; on sedimentary & serpentine formations

Elevations: 2000-2120'

Comments:  Ephemeral; requires physical disturbance

Updated:  3/31/98