Helianthemum scoparium
Nutt.
Common rush-rose, Peak rush-rose
Family:
Cistaceae
Habit:
Bushy, evergreen perennial, 2 to 3 dm., with yellow flowers.
Distribution:
Found on sandy flats and slopes near the coast, in closed-cone
pine, woods and coastal scrub. From Mendocino to Santa Barbara
County, Santa Cruz and Santa Rosa Islands.
Seed unit:
Free seed.
Seed:
Seeds are irregular, somewhat angled, black,
cellular–papillose, 1 mm. long. Found in a loculicidal capsule
3 to 4 mm. long.
Embryo:
Curved embryo with endosperm.
Purity
instructions:
Pure seed definition:
AOSA:
PSU #1 – Seed, with or without seed coat. Piece of broken
seed, with or without seed coat, larger than one-half the
original size.
ISTA: PSD #10 – Seed, with or without testa. Piece of seed
larger than one-half the original size, with or without testa.
Lab notes:
Samples often have a high percentage of dormant seed; viability
of ungerminated seeds may be determined using TZ.
Average pure
seed units per gram:
2,251 seeds per gram (based on AOSA pure seed units only from
31 samples received for testing from 1993 to 2004).
Range of
percent pure seed:
98 to 99%
Range of
percent inert:
1%
Description
of inert:
Plant material, stone, dirt.
Planting
instructions:
400 seeds, TB, 21 days @ 20-30°C, for fresh and dormant seed,
prechill recommended.
References:
(link
to main reference page)
Hickman, J.C., Ed. 1993. p. 516.
Munz, P.A. and D.D. Keck. 1968. p. 173.
Ransom Seed Laboratory
