Annual, erect to spreading, 1 to 4 dm; Stems slender, glabrous
to moderately pubescent.
Common on alkaline soils, flats and slopes below 3000 feet
to Washington and Baja California.
2 to 3 mm. long, ovate-elliptic, pinkish brown, flat, with one
edge thicker than the other. Seeds are found one per chamber in
the dehiscent fruit.
Foliar embryo, bent or folded, mucilaginous seed coat.
AOSA: PSU# 2 – Seed with at least a portion of the seed
coat attached. Broken seed larger than one-half the original
size with at least a portion of the seed coat attached.
ISTA: PSD #10 – Seed, with or without testa. Piece of seed
larger than one-half the original size, with or without testa.
Brassicaceae: seeds and pieces of seed without testa are
regarded as inert matter.
Seeds are gelatinous when wetted. Samples often contain a high
percentage of dormant seeds; viability of ungerminated seeds may
be determined using TZ.
pure seed units per gram:
998 seeds per gram (based on AOSA pure seed units only from 15
samples received for testing from 1992 to 2004).
percent pure seed:
93 to 99%
1 to 3%
Description of inert:
Plant material, dirt, stone.
400 seeds, TB, 14 days @ 20°C; for fresh and dormant seed, GA3
to main reference page)
J.C., Ed. 1993. p. 429.
Munz, P.A. and D.D. Keck. 1968. p. 228.
Martin, A.C. and W.D. Barkley. 1961. p. 162.
Ransom Seed Laboratory