(A.Gray) A. Gray
Habit: Annual, to 20 dm., whitish, scaly-puberulent below and branched above
Distribution: Found on open slopes and disturbed areas in the
Ranges of Southern California and northern Baja California.
Seed unit: Achene.
Seed: Compressed achene,
4 to 7 mm.
long, without pappus.
Embryo: Foliar embryo.
PSU# 27 - Intact achene 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/seed coat; if broken, larger than one-half the original
ISTA: PSD #1
– Achene, unless it is obvious that no seed is present.
Lab notes: Transparent, obviously empty achenes called inert. Use
of a diaphanoscope is helpful.
Average pure seed units per gram:
2,239 seeds per gram (based on AOSA pure seed units only from 4
samples received for testing from 1994 to 2004).
Range of percent pure seed:
48 to 67%
Range of percent inert: 32 to 51%
Description of inert: Plant material, broken seed.
Planting instructions: 400 seeds, TB, 21 days; for fresh and dormant
seed, prechill recommended.
to main reference page)
J.C., Ed. 1993. p. 224.