Parthenium Hysterophorus L.
Composite family. Compositae.
"Throughout Eastern and Central Texas. Dr. Harvard remarks that it is one of the commonest weeds about the streets of San Antonio." (Coulter). Hunter: in waste places and open town lots of which it takes possession. Honey yield good in favorable seasons when not too dry. White pollen. April, November.*
ROMAN WORMWOOD. Ambrosia artemisiaefolia L.
Composite family. Compositae.
"A common weed of waste grounds, extremely variable." (Coulter). Dry upland soils and waste places; probably pollen only. July, August.*
TALL RAGWEED. Ambrosia aptera DC.
Composite family. Compositae.
"Low grounds in Southern and Western Texas." (Coulter). Hunter: along field fences and low places. Some honey but more pollen of a resinous nature. July and August.*
GREAT RAGWEED. Ambrosia trifida L.