Ranunculus californicus

Ranunculus californicus Benth.
California buttercup

Family:  Ranunculaceae

Habit:  Perennial, 18 to 70 cm., hairy with cauline petioles, yellow flowers.

Distribution:  Scattered about open grassy woodland in coastal areas of California, Oregon and Baja California, Mexico.

Seed unit:  Achene; free seed.

Seed:  Achene obovoid – discoid  2 to 2.5 mm. long with stout recurved beaks, .8 mm.

Embryo:  Minute to small basal embryo in fleshy endosperm.

Purity instructions:  Pure seed definition:
AOSA:  PSU#39 - Intact achene with or without style, hairs, and/or spines, whether or not a seed is present. Piece of broken achene larger than one-half of the original size, unless no seed is present. Seed with or without seed coat. Piece of broken seed larger then one-half the original size.

Lab notes:  Achenes sometimes found in clusters, must be separated for planting.

Average pure seed units per gram:  503 seeds per gram (based on AOSA pure seed units only from two (2) samples received for testing from 2001 to 2002).

Range of percent pure seed:  94%

Range of percent inert:  4%

Description of inert:  Plant material, stone.

Planting instructions:   400 seeds, TB, 21 days at 15°C; for fresh and dormant seed, prechill recommended.

References:  (link to main reference page)
Hickman, J.C., Ed.  1993.  p. 925. 
Munz, P.A. and D.D. Keck.  1968.  p. 95.
Ransom Seed Laboratory
Smith, C.F.  1998.  p. 330.