Pappose Spikeweed (Centromadia parryi ssp. congdonii)

Global Rank: T2 - Imperiled
Legal Status: N/A
Family: Asteraceae
State: CA
Nature Serve ID: 152587
Lifeform: Forb/herb
Date Inducted in National Collection:

Description:

Also known as the Congdon’s tarplant, Centromadia parryi ssp. congdonii is a tarweed subspecies that is endemic to the northern California coast. Like its southern subspecies (C. p. ssp. australis), C. p. ssp. congdonii is a grassland herb that blooms yellow florets annually in heavy alkaline soil between May and October. It favors sea level elevations but has been seen as high up as 200m.

Where is Pappose Spikeweed (Centromadia parryi ssp. congdonii) located in the wild?

Habitat:

C. p. ssp. congdonii shares the same habitat preferences as its southern subspecies C. p. ssp. australis: sea level grasslands with heavy alkaline soil.

Distribution:

This subspecies of tarweed can primarily be found in Contra Costa, Alameda, and northern Monterey counties. There are also scattered occurrences in San Mateo, Santa Clara, Santa Cruz, and Solano counties. It is mainly a northern California herb, recorded sightings have been confirmed as far south as San Luis Obispo county.

States & Provinces:

Pappose Spikeweed can be found in California

Which CPC Partners conserve Pappose Spikeweed (Centromadia parryi ssp. congdonii)?

California Botanic Garden

Not Sponsored

Conservation Actions

Assigned 06/09/17

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

09/01/2020

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Centromadia parryi subsp. congdonii in orthodox seed collection. There are as many as 168078 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.