Tetradymia glabrata Torrey and A. Gray
Habit: Shrub 3 to 9 dm. high; branched, tomentose, with glabrate leaves.
Distribution: Dry scrub and Joshua tree woodland of the Great Basin and the Mojave Desert in California, Oregon, Idaho and Utah.
Seed unit: Achene.
Seed: Achene 3 to 5 mm., with short, stiff hairs; ribs glandular; pappus of many fine bristles 6 to 8 mm. long.
Embryo: Foliar with well-developed cotyledons, no endosperm.
Purity instructions: Pure seed definition:
AOSA: PSU# 50 - Intact achene, with or without one or more of the following structures: beak, bristle, hairs, pappus, wing, or firmly attached floral remnants, provided a true seed with some degree of embryo development can be detected (either by slight pressure or by examination over light).
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 size.
ISTA: PSD #4 – Achene, with or without pappus, unless it is obvious that no seed is present.
Average pure seed units per gram: 529 seeds per gram (based on AOSA pure seed units only from 1 sample received for testing in 2002).
Range of percent pure seed: 30%
Range of percent inert: 69%
Description of inert: Broken seed, plant material.
Planting instructions: 400 seeds, TB, 21 days @ 20°C; for fresh and dormant seed, prechill recommended.
References: (link to main reference page)
Hickman, J.C., Ed. 1993. p. 352.
Munz, P.A. and D.D. Keck. 1968. p. 1256.
Ransom Seed Laboratory