76057 Parthenium argentatum Scattered phleba, with [illegible] about an equal number of maricola bushes. Gentle slope with heavier soil than usual. Considerable introgression but some plants appear to be non-introgessed. 3.5 miles from marked Hwy 54 on road to Cedros. Zec. Sept 4, 1976 Furness off is 9 miles North of Junction Concepcion del Oro 76058 Parthenium argentatum Scattered stand of small phleba with 2 main types; non- introgressed with narrow leaves and introgressed with broader toothed leaves and long, weak peduncles. Slope below main mountain, 1.4 miles west of Hwy 54 from San Juan- del Retiro turnoff, highest of the two roads visible. Coah. No specimen taken. Sept 4, 1976 San Juan del Retiro turnoff in 9.3 miles North of Zacatecas state line.