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Aristida adscensionis
L.
Triple-awned grass
Family: Poaceae
Habit: Annual 1 to 8 dm. branched at base, purplish tinge, erect or
spreading.
Distribution: Dry open rocky sites and in shrubland.
San Luis
Obispo County to the deserts. Also in Texas, Kansas and
Argentina.
Seed unit: Spikelet with caryopsis.
Seed: Lower glume
5 to 7 mm.,
upper 8 to 10 mm.; lemma 6 to 13 mm.; 3 awns, 7 to 23 mm., equal
length. Tip is often beaked.
Embryo: Basal-lateral embryo area of seed caryopsis.
 Purity instructions:
Pure seed
definition:
AOSA: PSU #13 - Single floret spikelet or
floret with or without awns, provided a caryopsis with some
degree of endosperm development can be detected. Caryopsis or
piece of broken caryopsis larger than one-half of the original
size.
Lab notes:
Seeds often look like sticks and are attached to stems. Many
florets are without substance.
Average pure seed units per gram:
1352 seeds per gram (based on AOSA pure seed units only from
seven (7) samples received for testing from 1993 to 2003).
Range of percent pure seed:
10% to 53%
Range of percent inert: 44% to 88%
Description of inert: Plant material, chaff, broken seed, dirt, sticks.
Planting instructions: 400 seeds, TB, 21 days at 15-25°C; for fresh and
dormant seed, prechill and GA3
recommended.
References:
(link
to main reference page)
Hickman, J.C., Ed. 1993. p. 1234.
Munz, P.A. and D.D. Keck. 1968. p. 1535.
Ransom Seed Laboratory |
