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Acanthaceae

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Asteraceae: Composite Family (Compositae)

This is the sunflower or daisy family. It is one of the easiest families of flowering plants to identify. Yet, it is a surprise to almost everyone when they find out that the daisy they gave to their lover, is realy not one flower, but possibly a hundred flowers. Most sunflowers, like the Arrowleaf Balsamroot, (as seen in the video to the right), have two different types of flowers: those that make up the outer "petals" (called ray flowers) and those that make up the inner "disc" (called disc flowers).

Systmatics: This group is a very diverse group. Because of this it is divided into several tribes. There are a few uniting features however.

Specimens List

	Arrowleaf Balsamroot: Native plant in the northwest (Picture only)		Burdock - Arctium minus VIDEO: of the problem plant species in the US presented by Rob Nelson
	Blue Lettuce - Lactuca tatarica: VIDEO: of the problem plant species in the US		Bull thistle: Cirsium vulgare VIDEO: of the problem plant in the US
	Barnaby's Thistle - Centaurea solstitialis: Info: of the problem plant species in the US.		Canada Thistle - Cirsium arvense VIDEO: of the problem plant species in the US found in Yellowstone
	Climbing Hempweed - Mikania scandens: INFO: of the problem plant species in the US.		Common Cocklebur - Xanthium strumarium VIDEO: of the problem plant in the US found along the Mississippi
	Diffuse Knapweed - Centaurea diffusa: INFO: on this problem plant species in the US		Field Sowthistle - Sonchus arvensis VIDEO: of the problem plant in the US
	Gallant Soldier - Galinsoga parviflora: Info: of the problem plant species in the US.		Musk Thistle - Carduus nutans VIDEO: of the problem plant in the US
	Oxeye Daisy - Leucanthemum vulgare: VIDEO: of the problem plant species in the US.		Plumeless Thistle - Carduus acanthoides INFO: of the problem plant in the US
	Purple Starthistle - Centaurea calcitrapa INFO: of the problem plant species in the US.		Russian Knapweed - Acroptilon repens INFO: of the problem plant in the US
	Scotch Thistle - Onopordum acanthium: Info: of the problem plant species in the US.		Spotted Knapweed - Centaurea biebersteinii INFO: of the problem plant in the US
	Sunflower - Helianthus annus: VIDEO: of the problem plant species in the US.		Texas Blueweed - Helianthus ciliaris INFO: of the problem plant in the US

Links to more information:

• UH Botany plant descriptions: Very scientific description of the family with pictures
• Wikepedia Plant information and description
  

Videos on the Web