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Poa secunda J.S. Presl
One-sided bluegrass
 Family:
Poaceae
Habit:
Perennial grass growing in matted tufts, 1.5 to 10 dm.
Distribution:
Commonly scattered from coastal woodland to chaparral and
coniferous forest. California to Alaska, Rocky Mountains,
northwest Mexico, and South America. Many ecological forms,
tends to intergrade.
Seed unit:
Multiple floret spikelet or floret with caryopsis.
Seed:
(Floret) - Lemma awnless, 3.5 to 5 mm. Amount of pubescence on
lemma and whether the lemma is keeled or not help to determine
subspecies.
Embryo:
Basal lateral embryo area of seed caryopsis.
 Purity
instructions:
Pure seed definition:
AOSA:
PSU #14 – Multiple floret spikelet, multiple floret or floret,
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.
ISTA: #41 – Spikelet - with lemma and palea enclosing a
caryopsis, plus attached sterile floret. Floret - with lemma
and palea enclosing a caryopsis. Caryopsis - piece of caryopsis
larger than one-half the original size.
Lab notes:
Presence of empty florets common in samples. Blowing point with
general blower approximately #11.
Average pure
seed units per gram:
2,075 seeds per gram (based on AOSA pure seed units only from
73 samples received for testing from 2002 to 2003).
Range of
percent pure seed:
63% to 99%
Range of
percent inert:
1% to 35%
Description
of inert:
Chaff, empty florets, plant material, broken seed.
Planting
instructions:
400 seeds, TB, 21 days @ 20-30°C; for fresh and dormant seed,
prechill and GA3 recommended.
References:
(link
to main reference page)
Hickman,
J.C., Ed. 1993. p. 1289.
Ransom Seed Laboratory
Smith, C.F. 1998. p. 121. |
