Calflora: Hemizonia congesta ssp. congesta

Hemizonia congesta DC. ssp. congesta

hayfield tarweed

Hemizonia congesta ssp. congesta, a dicot, is an annual herb that is native to California and is endemic (limited) to California alone.

It is included in the CNPS Inventory of Rare and Endangered Plants on list 1B.2 (rare, threatened, or endangered in CA and elsewhere). 7th Edition / 8th Edition

Communities:	Northern Coastal Scrub, Valley Grassland
Affinity to serpentine soil: 1.3 (weak indicator / indifferent) [Safford et al 2005]
Elevation:	between 0 and 984 feet
Family:	ASTERACEAE
Related:	See a list of other species in the genus Hemizonia found in California.
	See the more inclusive parent record Hemizonia congesta.

Name Status:

Accepted by TJM2 + PLANTS + JM93

Other Names:
(according to)

PLANTS:	Hemizonia congesta ssp. lutescens
PLANTS:	Hemizonia lutescens
PLANTS:	Hemizonia luzulifolia var. lutescens
PLANTS:	Hemizonia multicaulis
TJM2:	Hemizonia congesta ssp. leucocephala

Plant
Characteristics
+ Associated
Organisms

Bloom Period

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Observation Hotline
including observations with photos

Distribution by County:

See a detailed Distribution Grid of this plant in California.

A shaded county indicates that there are ocurrence records of this plant within the county.

Hover the mouse over the map to see county names. Click to view records from that county.

	There are specimen records from this county in an herbarium.
	There are documented records, vouchered or confirmed by an expert.
	There are reported records.
	There are reported records available indirectly (eg. in botanical literature).

Records by County, with approximate record counts in the form: TOTAL / CCH. Click county name to view records.

Alameda: 8 / 1 CCH Contra Costa: 23 / 9 CCH Glenn: 1 / 1 CCH Mendocino: 19 / 15 CCH Monterey: 6 / 6 CCH Marin: 129 / 86 CCH Napa: 8 / 7 CCH San Mateo: 1 / 1 CCH Solano: 6 / 3 CCH Sonoma: 90 / 71 CCH

CCH: records provided by the participants of the Consortium of California Herbaria.

Information about Hemizonia congesta ssp. congesta from other sources:

Photos on Picasa / Flickr / Google Images
website references on Google
USDA PLANTS Profile (HECOC2)
Nursery availability and horticultural info (what grows with this plant?) on CNPLX
CNPS Inventory of rare and endangered plants
2012 Jepson Manual Treament from the Jepson Herbarium,
University of California, Berkeley
Original Publication citation. on the International Plants Names Index
Search efloras.org (Flora of North America)
Search the Lady Bird Johnson Wildflower Center Native Plant Database