76077 Synthelopsis Flowers white, foliage lavender. Perennial. Sandy ground, Near Campo Experimental Cuencame, about 7 kilometers south of Piedras Negras. Sept 8, 1976 76078 Helianthemum camporum (Slay) Greene Perennial. Calyxes contrary to petiolion. Flowers white. Gravelly soil, 8.2 miles east of Valardena Hwy to, along road to Chamizal mine. Hwy 45 at junction of road to Valardena. Dgo. Sept 8, 1976 76079 Parthenium argentatum Shrubs with heavy trunks and much branched from base. Leaves unusually large, luteine or one- or two-toothed. Stand scattered over a wide area. Shrubs tend to be uniform throughout. No introgression evident. Shrubs