Bibliography.

PFG1:

Peterson Field Guides Southwestern and Texas Wildflowers. Nichaus/Ripper/Savage, 1984, Houghton Mifflin

WOT:

Wildflowers of Texas, Geyata Ajilvsgi, 1984, Shearer.

WOH:

Wildflowers of Houston, John & Gloria Tveten, 1993, Rice University Press.

TW:

Campbell and Lynn Loughmiller, 1996, University of Texas Press.

NWG:

Newcomb's Wildflower Guide, Lawrence Newcomb, 1977, Little, Brown

AFG1:

The Audubon Society Field Guide to North American Wildflowers Eastern Region, Niering & Olmstead, 1979, knopf

AFG2:

The Audubon Society Field Guide to North American Wildflowers Western Region, Richard Spellenburg, 1979, knopf

PFG2:

Peterson Field Guides Wildflowers Northeastern/northcentral North America. Roger Tory Peterson/Margaret McKenny, 1968, Houghton Mifflin co.