Wyethia mollis

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)
Hickman, J.C., Ed. 1993. p. 359.
Munz, P.A. and D.D. Keck.  1968.  p. 1085.
Ransom Seed Laboratory