Poa secunda

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.