Rhamnus crocea

Rhamnus crocea Nutt.
Spiny redberry

Family:  Rhamnaceae

Habit:  Shrub to 2 meters, sometimes thorn-tipped.

Distribution:  Found in coastal foothill chaparral and woodlands from Sonoma County in Northern California to Baja California, Mexico.  

Seed unit:  The fruit is a berrylike drupe containing two to four nutlike seeds (seed unit is the free seed).

Seed:  5 to 6 mm. long, broadly rounded, triangular with a wedge-shaped opening on one face.  Has a distinct line lengthwise on the flat face.

Embryo:  Foliar with endosperm.

Purity instructions:  Pure seed definition:
AOSA:  PSU#1 - Seed, with or without seed coat. Piece of broken seed, with or without seed coat, larger than one-half the original size.

Lab notes: There are often intact seeds with no embryos.

Average pure seed units per gram:  113 seeds per gram (based on AOSA pure seed units only from 8 samples received for testing from 1994 to 2002). 

Range of percent pure seed:  96 to 99%

Range of percent inert:  .3 to 3.2%

Description of inert:  Plant material, sticks, stone, broken seed.

Planting instructions:  400 seeds, T, 35 days @ 15°C; for fresh and dormant seed, GA3 recommended.

References:  (link to main reference page)
Hickman, J.C., Ed.  1993.  p. 940
Ransom Seed Laboratory