Grindelia camporum E. Greene
Habit: Perennial 5 to 12 dm. high, with several erect herbaceous stems, appearing white-varnished.
Distribution: Found in sandy or saline bottomlands, fields, and roadsides of the San Joaquin Valley, south and central California coast, and Baja California.
Seed unit: Achene with or without pappus.
Seed: Achene 2 to 5 mm., angled, white to golden brown; tops generally flanged; with two to six pappus awns.
Embryo: Foliar embryo.
Purity instructions: Pure seed definition:
AOSA: PSU #28 - Intact achene with or without pappus, whether or not a seed is present. Piece of broken achene larger than one-half of the original size, unless no seed is present. Seed, with or without pericarp/seedcoat; if broken, larger than one-half the original size.
ISTA: PSD #4 – Achene with or without pappus, unless it is obvious that no seed is present.
Lab notes: In many samples, a high percentage of intact achenes are empty. The pappus is usually not present in commercial samples.
Average pure seed units per gram: 571 seeds per gram (based on AOSA pure seed units only from 9 samples received for testing from 1999 to 2004).
Range of percent pure seed: 38% to 96%
Range of percent inert: 3% to 60%
Description of inert: Live insects, dirt, broken seed, plant material.
Planting instructions: 400 seeds, TB, 21 days @ 15-25°C; prechill not recommended.
References: (link to main reference page)
Hickman, J.C., Ed. 1993. p. 273.
Ransom Seed Laboratory