Wyethia
mollis A.
Gray
Mules
ears
Family:
Asteraceae
Habit:
Shrub, slightly woody at the base; stems
4 to 10 dm.
high, densely tomentose and resin-dotted, with large yellow
flowers.
Distribution:
Dry wooded slopes and rocky openings on montane coniferous
slopes of the Sierra Nevada, southeastern
Oregon
and western Nevada.
Seed unit:
Achene.
Seed:
Achenes 9 to 11 mm. long, tomentose, with short pappus scales.
Ray achenes three-angled; disk achenes compressed, four-angled.
Embryo:
Foliar with well developed cotyledons.
Purity
instructions:
Pure seed definition:
AOSA:
PSU# 28 - Intact achene with or without pappus,
whether or not a seed is present.
ISTA: PSD #4 – Achene, with or without pappus, unless it is
obvious that no seed is present.
Lab notes:
Samples often have a high percentage of dormant seed; in
addition to prechilling, TZ is useful in determining the
viability of ungerminated seed.
Average pure
seed units per gram:
51 seeds per gram (based on AOSA pure seed units only from 5
samples received for testing from 2000 to 2005).
Range of
percent pure seed:
46 to 98%
Range of
percent inert:
1% to 53%
Description
of inert:
Plant material, broken seed.
Planting
instructions:
400 seeds, T, 21 days @ 20°C; for fresh and dormant seed,
prechill recommended.
References:
(link
to main reference page)
