Xanthium strumarium, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Pycnanthemum sp., whole plant. Family Lamiaceae, Subclass Asteridae. Origin: Native
Callitriche stagnalis, foliage. Family Callitrichaceae, Subclass Asteridae. Origin: Native
Symphyotrichum patens, inflorescence - front view. Family Asteraceae, Subclass Asteridae. Origin: Na...
Xanthium strumarium, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Xanthium strumarium, fruit. Family Asteraceae, Subclass Asteridae. Origin: Native
Xanthium strumarium, senescent plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Xanthisma texanum, heads (with yellow legume in foreground). Family Asteraceae, Subclass Asteridae. ...
Parthenium hysterophorus, Capitulum from above. Family Asteraceae, Subclass Asteridae. Origin: Nativ...
Silphium radula, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Parthenium argentatum, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Symphyotrichum subulatum, Capitula at anthesis; (Aster subulatus) . Family Asteraceae, Subclass Ast...
Symphyotrichum ericoides, Plant in flower. Family Asteraceae, Subclass Asteridae. Origin: Native
Parthenium hysterophorus, Plant in flower. Family Asteraceae, Subclass Asteridae. Origin: Native
Parthenium hysterophorus, Capitulum from side. Family Asteraceae, Subclass Asteridae. Origin: Native
Eupatorium serotinum, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Pycnanthemum sp., whole plant. Family Lamiaceae, Subclass Asteridae. Origin: Native
Callitriche stagnalis, foliage. Family Callitrichaceae, Subclass Asteridae. Origin: Native
Symphyotrichum patens, inflorescence - front view. Family Asteraceae, Subclass Asteridae. Origin: Na...
Xanthium strumarium, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Xanthium strumarium, fruit. Family Asteraceae, Subclass Asteridae. Origin: Native
Xanthium strumarium, senescent plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Xanthisma texanum, heads (with yellow legume in foreground). Family Asteraceae, Subclass Asteridae. ...
Parthenium hysterophorus, Capitulum from above. Family Asteraceae, Subclass Asteridae. Origin: Nativ...
Silphium radula, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Parthenium argentatum, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Symphyotrichum subulatum, Capitula at anthesis; (Aster subulatus) . Family Asteraceae, Subclass Ast...
Symphyotrichum ericoides, Plant in flower. Family Asteraceae, Subclass Asteridae. Origin: Native
Parthenium hysterophorus, Plant in flower. Family Asteraceae, Subclass Asteridae. Origin: Native
Parthenium hysterophorus, Capitulum from side. Family Asteraceae, Subclass Asteridae. Origin: Native
Eupatorium serotinum, whole plant. Family Asteraceae, Subclass Asteridae. Origin: Native
Pycnanthemum sp., whole plant. Family Lamiaceae, Subclass Asteridae. Origin: Native
Callitriche stagnalis, foliage. Family Callitrichaceae, Subclass Asteridae. Origin: Native
Symphyotrichum patens, inflorescence - front view. Family Asteraceae, Subclass Asteridae. Origin: Na...