Hickman, J.C., Ed.  1993.  The Jepson Manual:  Higher Plants of California.  University of California Press.  Berkeley.  1,400 pp.

Martin, A.C. and W.D. Barkley.  1961.  Seed Identification Manual.  University of California Press.  Berkeley.  221 pp.

Munz, P.A. and D.D. Keck.  1968.  A California Flora with Supplement.  University of California Press.  Los Angeles.  1,905 pp.

Ransom Seed Laboratory – Unpublished data collected from 1980 to present.

Rules for Testing Seeds, Association of Official Seed Analysts (AOSA), (current edition). 

Seed Science and Technology Rules, International Rules for Seed Testing (ISTA), (current edition).

Smith, C.F.  1998.  A Flora of the Santa Barbara Region, California.  Second Edition.  Santa Barbara Botanic Garden and Capra Press.  Santa Barbara.  391 pp.